diff options
Diffstat (limited to 'mysql-test/r/join_cache.result')
| -rw-r--r-- | mysql-test/r/join_cache.result | 6019 |
1 files changed, 0 insertions, 6019 deletions
diff --git a/mysql-test/r/join_cache.result b/mysql-test/r/join_cache.result deleted file mode 100644 index eea397402ad..00000000000 --- a/mysql-test/r/join_cache.result +++ /dev/null @@ -1,6019 +0,0 @@ -DROP TABLE IF EXISTS t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11; -DROP DATABASE IF EXISTS world; -set @save_optimizer_switch=@@optimizer_switch; -set @@optimizer_switch='optimize_join_buffer_size=on'; -set optimizer_switch='semijoin=on,firstmatch=on,loosescan=on'; -set @@optimizer_switch='semijoin_with_cache=on'; -set @@optimizer_switch='outer_join_with_cache=on'; -set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on'; -set @local_join_cache_test_optimizer_switch_default=@@optimizer_switch; -set names utf8; -CREATE DATABASE world; -use world; -CREATE TABLE Country ( -Code char(3) NOT NULL default '', -Name char(52) NOT NULL default '', -SurfaceArea float(10,2) NOT NULL default '0.00', -Population int(11) NOT NULL default '0', -Capital int(11) default NULL -); -CREATE TABLE City ( -ID int(11) NOT NULL, -Name char(35) NOT NULL default '', -Country char(3) NOT NULL default '', -Population int(11) NOT NULL default '0' -); -CREATE TABLE CountryLanguage ( -Country char(3) NOT NULL default '', -Language char(30) NOT NULL default '', -Percentage float(3,1) NOT NULL default '0.0' -); -SELECT COUNT(*) FROM Country; -COUNT(*) -239 -SELECT COUNT(*) FROM City; -COUNT(*) -4079 -SELECT COUNT(*) FROM CountryLanguage; -COUNT(*) -984 -show variables like 'join_buffer_size'; -Variable_name Value -join_buffer_size 262144 -set join_cache_level=1; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 1 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join) -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -set join_cache_level=2; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 2 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join) -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (incremental, BNL join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -set join_cache_level=3; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 3 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -set join_cache_level=4; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 4 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (incremental, BNLH join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND City.Population > 5000000 -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -Name Population Name Population -China 1277558000 Shanghai 9696300 -China 1277558000 Peking 7472000 -China 1277558000 Chongqing 6351600 -China 1277558000 Tianjin 5286800 -Colombia 42321000 Santafé de Bogotá 6260862 -Congo, The Democratic Republic of the 51654000 Kinshasa 5064000 -Chile 15211000 NULL NULL -Cambodia 11168000 NULL NULL -Cameroon 15085000 NULL NULL -Canada 31147000 NULL NULL -Cuba 11201000 NULL NULL -Côte d?Ivoire 14786000 NULL NULL -Czech Republic 10278100 NULL NULL -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND -(City.Population > 5000000 OR City.Name LIKE 'Za%') -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -Name Population Name Population -China 1277558000 Shanghai 9696300 -China 1277558000 Peking 7472000 -China 1277558000 Chongqing 6351600 -China 1277558000 Tianjin 5286800 -China 1277558000 Zaozhuang 380846 -China 1277558000 Zaoyang 162198 -China 1277558000 Zalantun 130031 -Colombia 42321000 Santafé de Bogotá 6260862 -Congo, The Democratic Republic of the 51654000 Kinshasa 5064000 -Chile 15211000 NULL NULL -Cambodia 11168000 NULL NULL -Cameroon 15085000 NULL NULL -Canada 31147000 NULL NULL -Cuba 11201000 NULL NULL -Côte d?Ivoire 14786000 NULL NULL -Czech Republic 10278100 NULL NULL -CREATE INDEX City_Population ON City(Population); -CREATE INDEX City_Name ON City(Name); -ANALYZE TABLE City; -EXPLAIN -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND City.Population > 5000000 -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City hash_range City_Population #hash#$hj:City_Population 3:4 world.Country.Code 25 Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join) -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND City.Population > 5000000 -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -Name Population Name Population -China 1277558000 Shanghai 9696300 -China 1277558000 Peking 7472000 -China 1277558000 Chongqing 6351600 -China 1277558000 Tianjin 5286800 -Colombia 42321000 Santafé de Bogotá 6260862 -Congo, The Democratic Republic of the 51654000 Kinshasa 5064000 -Chile 15211000 NULL NULL -Cambodia 11168000 NULL NULL -Cameroon 15085000 NULL NULL -Canada 31147000 NULL NULL -Cuba 11201000 NULL NULL -Côte d?Ivoire 14786000 NULL NULL -Czech Republic 10278100 NULL NULL -EXPLAIN -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND -(City.Population > 5000000 OR City.Name LIKE 'Za%') -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City hash_index_merge City_Population,City_Name #hash#$hj:City_Population,City_Name 3:4,35 world.Country.Code 96 Using sort_union(City_Population,City_Name); Using where; Using join buffer (flat, BNLH join) -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND -(City.Population > 5000000 OR City.Name LIKE 'Za%') -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -Name Population Name Population -China 1277558000 Shanghai 9696300 -China 1277558000 Peking 7472000 -China 1277558000 Chongqing 6351600 -China 1277558000 Tianjin 5286800 -China 1277558000 Zaozhuang 380846 -China 1277558000 Zaoyang 162198 -China 1277558000 Zalantun 130031 -Colombia 42321000 Santafé de Bogotá 6260862 -Congo, The Democratic Republic of the 51654000 Kinshasa 5064000 -Chile 15211000 NULL NULL -Cambodia 11168000 NULL NULL -Cameroon 15085000 NULL NULL -Canada 31147000 NULL NULL -Cuba 11201000 NULL NULL -Côte d?Ivoire 14786000 NULL NULL -Czech Republic 10278100 NULL NULL -DROP INDEX City_Population ON City; -DROP INDEX City_Name ON City; -set join_cache_level=1; -set join_buffer_size=256; -show variables like 'join_buffer_size'; -Variable_name Value -join_buffer_size 256 -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 1 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join) -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -set join_cache_level=2; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 2 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join) -1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (incremental, BNL join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -set join_cache_level=3; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 3 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -set join_cache_level=4; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 4 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (incremental, BNLH join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -set join_cache_level=default; -set join_buffer_size=default; -show variables like 'join_buffer_size'; -Variable_name Value -join_buffer_size 262144 -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 2 -DROP DATABASE world; -CREATE DATABASE world; -use world; -CREATE TABLE Country ( -Code char(3) NOT NULL default '', -Name char(52) NOT NULL default '', -SurfaceArea float(10,2) NOT NULL default '0.00', -Population int(11) NOT NULL default '0', -Capital int(11) default NULL, -PRIMARY KEY (Code), -UNIQUE INDEX (Name) -); -CREATE TABLE City ( -ID int(11) NOT NULL auto_increment, -Name char(35) NOT NULL default '', -Country char(3) NOT NULL default '', -Population int(11) NOT NULL default '0', -PRIMARY KEY (ID), -INDEX (Population), -INDEX (Country) -); -CREATE TABLE CountryLanguage ( -Country char(3) NOT NULL default '', -Language char(30) NOT NULL default '', -Percentage float(3,1) NOT NULL default '0.0', -PRIMARY KEY (Country, Language), -INDEX (Percentage) -); -show variables like 'join_buffer_size'; -Variable_name Value -join_buffer_size 262144 -set join_cache_level=3; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 3 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.CountryLanguage.Country 239 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE City hash_ALL Country #hash#Country 3 world.CountryLanguage.Country 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -EXPLAIN -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage hash_ALL PRIMARY #hash#PRIMARY 33 world.Country.Code,const 984 Using where; Using join buffer (flat, BNLH join) -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -Australia 81.2 -United Kingdom 97.3 -Canada 60.4 -United States 86.2 -Zimbabwe 2.2 -Japan 0.1 -South Africa 8.5 -Malaysia 1.6 -Afghanistan NULL -Netherlands NULL -Algeria NULL -Angola NULL -Argentina NULL -Bangladesh NULL -Belgium NULL -Brazil NULL -Burkina Faso NULL -Chile NULL -Ecuador NULL -Egypt NULL -Spain NULL -Ethiopia NULL -Philippines NULL -Ghana NULL -Guatemala NULL -Indonesia NULL -India NULL -Iraq NULL -Iran NULL -Italy NULL -Yemen NULL -Yugoslavia NULL -Cambodia NULL -Cameroon NULL -Kazakstan NULL -Kenya NULL -China NULL -Colombia NULL -Congo, The Democratic Republic of the NULL -North Korea NULL -South Korea NULL -Greece NULL -Cuba NULL -Madagascar NULL -Malawi NULL -Mali NULL -Morocco NULL -Mexico NULL -Mozambique NULL -Myanmar NULL -Nepal NULL -Niger NULL -Nigeria NULL -Côte d?Ivoire NULL -Pakistan NULL -Peru NULL -Poland NULL -France NULL -Romania NULL -Germany NULL -Saudi Arabia NULL -Somalia NULL -Sri Lanka NULL -Sudan NULL -Syria NULL -Taiwan NULL -Tanzania NULL -Thailand NULL -Czech Republic NULL -Turkey NULL -Uganda NULL -Ukraine NULL -Hungary NULL -Uzbekistan NULL -Belarus NULL -Venezuela NULL -Russian Federation NULL -Vietnam NULL -show variables like 'join_buffer_size'; -Variable_name Value -join_buffer_size 262144 -set join_cache_level=4; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 4 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.CountryLanguage.Country 239 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE City hash_ALL Country #hash#Country 3 world.CountryLanguage.Country 4079 Using where; Using join buffer (incremental, BNLH join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -EXPLAIN -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage hash_ALL PRIMARY #hash#PRIMARY 33 world.Country.Code,const 984 Using where; Using join buffer (flat, BNLH join) -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -Australia 81.2 -United Kingdom 97.3 -Canada 60.4 -United States 86.2 -Zimbabwe 2.2 -Japan 0.1 -South Africa 8.5 -Malaysia 1.6 -Afghanistan NULL -Netherlands NULL -Algeria NULL -Angola NULL -Argentina NULL -Bangladesh NULL -Belgium NULL -Brazil NULL -Burkina Faso NULL -Chile NULL -Ecuador NULL -Egypt NULL -Spain NULL -Ethiopia NULL -Philippines NULL -Ghana NULL -Guatemala NULL -Indonesia NULL -India NULL -Iraq NULL -Iran NULL -Italy NULL -Yemen NULL -Yugoslavia NULL -Cambodia NULL -Cameroon NULL -Kazakstan NULL -Kenya NULL -China NULL -Colombia NULL -Congo, The Democratic Republic of the NULL -North Korea NULL -South Korea NULL -Greece NULL -Cuba NULL -Madagascar NULL -Malawi NULL -Mali NULL -Morocco NULL -Mexico NULL -Mozambique NULL -Myanmar NULL -Nepal NULL -Niger NULL -Nigeria NULL -Côte d?Ivoire NULL -Pakistan NULL -Peru NULL -Poland NULL -France NULL -Romania NULL -Germany NULL -Saudi Arabia NULL -Somalia NULL -Sri Lanka NULL -Sudan NULL -Syria NULL -Taiwan NULL -Tanzania NULL -Thailand NULL -Czech Republic NULL -Turkey NULL -Uganda NULL -Ukraine NULL -Hungary NULL -Uzbekistan NULL -Belarus NULL -Venezuela NULL -Russian Federation NULL -Vietnam NULL -EXPLAIN -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND City.Population > 5000000 -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range Name Name 52 NULL # Using index condition; Using where; Rowid-ordered scan -1 SIMPLE City hash_range Population,Country #hash#Country:Population 3:4 world.Country.Code # Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join) -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND City.Population > 5000000 -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -Name Population Name Population -China 1277558000 Shanghai 9696300 -China 1277558000 Peking 7472000 -China 1277558000 Chongqing 6351600 -China 1277558000 Tianjin 5286800 -Colombia 42321000 Santafé de Bogotá 6260862 -Congo, The Democratic Republic of the 51654000 Kinshasa 5064000 -Chile 15211000 NULL NULL -Cambodia 11168000 NULL NULL -Cameroon 15085000 NULL NULL -Canada 31147000 NULL NULL -Cuba 11201000 NULL NULL -Côte d?Ivoire 14786000 NULL NULL -Czech Republic 10278100 NULL NULL -CREATE INDEX City_Name ON City(Name); -EXPLAIN -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND -(City.Population > 5000000 OR City.Name LIKE 'Za%') -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range Name Name 52 NULL 17 Using index condition; Using where; Rowid-ordered scan -1 SIMPLE City hash_index_merge Population,Country,City_Name #hash#Country:Population,City_Name 3:4,35 world.Country.Code 96 Using sort_union(Population,City_Name); Using where; Using join buffer (flat, BNLH join) -SELECT Country.Name, Country.Population, City.Name, City.Population -FROM Country LEFT JOIN City -ON City.Country=Country.Code AND -(City.Population > 5000000 OR City.Name LIKE 'Za%') -WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000; -Name Population Name Population -China 1277558000 Shanghai 9696300 -China 1277558000 Peking 7472000 -China 1277558000 Chongqing 6351600 -China 1277558000 Tianjin 5286800 -China 1277558000 Zaozhuang 380846 -China 1277558000 Zaoyang 162198 -China 1277558000 Zalantun 130031 -Colombia 42321000 Santafé de Bogotá 6260862 -Congo, The Democratic Republic of the 51654000 Kinshasa 5064000 -Chile 15211000 NULL NULL -Cambodia 11168000 NULL NULL -Cameroon 15085000 NULL NULL -Canada 31147000 NULL NULL -Cuba 11201000 NULL NULL -Côte d?Ivoire 14786000 NULL NULL -Czech Republic 10278100 NULL NULL -DROP INDEX City_Name ON City; -show variables like 'join_buffer_size'; -Variable_name Value -join_buffer_size 262144 -set join_cache_level=5; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 5 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE City ref Country Country 3 world.CountryLanguage.Country 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -EXPLAIN -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -Australia 81.2 -United Kingdom 97.3 -Canada 60.4 -United States 86.2 -Zimbabwe 2.2 -Japan 0.1 -South Africa 8.5 -Malaysia 1.6 -Afghanistan NULL -Netherlands NULL -Algeria NULL -Angola NULL -Argentina NULL -Bangladesh NULL -Belgium NULL -Brazil NULL -Burkina Faso NULL -Chile NULL -Ecuador NULL -Egypt NULL -Spain NULL -Ethiopia NULL -Philippines NULL -Ghana NULL -Guatemala NULL -Indonesia NULL -India NULL -Iraq NULL -Iran NULL -Italy NULL -Yemen NULL -Yugoslavia NULL -Cambodia NULL -Cameroon NULL -Kazakstan NULL -Kenya NULL -China NULL -Colombia NULL -Congo, The Democratic Republic of the NULL -North Korea NULL -South Korea NULL -Greece NULL -Cuba NULL -Madagascar NULL -Malawi NULL -Mali NULL -Morocco NULL -Mexico NULL -Mozambique NULL -Myanmar NULL -Nepal NULL -Niger NULL -Nigeria NULL -Côte d?Ivoire NULL -Pakistan NULL -Peru NULL -Poland NULL -France NULL -Romania NULL -Germany NULL -Saudi Arabia NULL -Somalia NULL -Sri Lanka NULL -Sudan NULL -Syria NULL -Taiwan NULL -Tanzania NULL -Thailand NULL -Czech Republic NULL -Turkey NULL -Uganda NULL -Ukraine NULL -Hungary NULL -Uzbekistan NULL -Belarus NULL -Venezuela NULL -Russian Federation NULL -Vietnam NULL -set join_cache_level=6; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 6 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE City ref Country Country 3 world.CountryLanguage.Country 18 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -EXPLAIN -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -Australia 81.2 -United Kingdom 97.3 -Canada 60.4 -United States 86.2 -Zimbabwe 2.2 -Japan 0.1 -South Africa 8.5 -Malaysia 1.6 -Afghanistan NULL -Netherlands NULL -Algeria NULL -Angola NULL -Argentina NULL -Bangladesh NULL -Belgium NULL -Brazil NULL -Burkina Faso NULL -Chile NULL -Ecuador NULL -Egypt NULL -Spain NULL -Ethiopia NULL -Philippines NULL -Ghana NULL -Guatemala NULL -Indonesia NULL -India NULL -Iraq NULL -Iran NULL -Italy NULL -Yemen NULL -Yugoslavia NULL -Cambodia NULL -Cameroon NULL -Kazakstan NULL -Kenya NULL -China NULL -Colombia NULL -Congo, The Democratic Republic of the NULL -North Korea NULL -South Korea NULL -Greece NULL -Cuba NULL -Madagascar NULL -Malawi NULL -Mali NULL -Morocco NULL -Mexico NULL -Mozambique NULL -Myanmar NULL -Nepal NULL -Niger NULL -Nigeria NULL -Côte d?Ivoire NULL -Pakistan NULL -Peru NULL -Poland NULL -France NULL -Romania NULL -Germany NULL -Saudi Arabia NULL -Somalia NULL -Sri Lanka NULL -Sudan NULL -Syria NULL -Taiwan NULL -Tanzania NULL -Thailand NULL -Czech Republic NULL -Turkey NULL -Uganda NULL -Ukraine NULL -Hungary NULL -Uzbekistan NULL -Belarus NULL -Venezuela NULL -Russian Federation NULL -Vietnam NULL -set join_cache_level=7; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 7 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -1 SIMPLE City ref Country Country 3 world.CountryLanguage.Country 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -EXPLAIN -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -Australia 81.2 -United Kingdom 97.3 -Canada 60.4 -United States 86.2 -Zimbabwe 2.2 -Japan 0.1 -South Africa 8.5 -Malaysia 1.6 -Afghanistan NULL -Netherlands NULL -Algeria NULL -Angola NULL -Argentina NULL -Bangladesh NULL -Belgium NULL -Brazil NULL -Burkina Faso NULL -Chile NULL -Ecuador NULL -Egypt NULL -Spain NULL -Ethiopia NULL -Philippines NULL -Ghana NULL -Guatemala NULL -Indonesia NULL -India NULL -Iraq NULL -Iran NULL -Italy NULL -Yemen NULL -Yugoslavia NULL -Cambodia NULL -Cameroon NULL -Kazakstan NULL -Kenya NULL -China NULL -Colombia NULL -Congo, The Democratic Republic of the NULL -North Korea NULL -South Korea NULL -Greece NULL -Cuba NULL -Madagascar NULL -Malawi NULL -Mali NULL -Morocco NULL -Mexico NULL -Mozambique NULL -Myanmar NULL -Nepal NULL -Niger NULL -Nigeria NULL -Côte d?Ivoire NULL -Pakistan NULL -Peru NULL -Poland NULL -France NULL -Romania NULL -Germany NULL -Saudi Arabia NULL -Somalia NULL -Sri Lanka NULL -Sudan NULL -Syria NULL -Taiwan NULL -Tanzania NULL -Thailand NULL -Czech Republic NULL -Turkey NULL -Uganda NULL -Ukraine NULL -Hungary NULL -Uzbekistan NULL -Belarus NULL -Venezuela NULL -Russian Federation NULL -Vietnam NULL -set join_cache_level=8; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 8 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -1 SIMPLE City ref Country Country 3 world.CountryLanguage.Country 18 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -EXPLAIN -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where -1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -FROM Country LEFT JOIN CountryLanguage ON -(CountryLanguage.Country=Country.Code AND Language='English') -WHERE -Country.Population > 10000000; -Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage) -Australia 81.2 -United Kingdom 97.3 -Canada 60.4 -United States 86.2 -Zimbabwe 2.2 -Japan 0.1 -South Africa 8.5 -Malaysia 1.6 -Afghanistan NULL -Netherlands NULL -Algeria NULL -Angola NULL -Argentina NULL -Bangladesh NULL -Belgium NULL -Brazil NULL -Burkina Faso NULL -Chile NULL -Ecuador NULL -Egypt NULL -Spain NULL -Ethiopia NULL -Philippines NULL -Ghana NULL -Guatemala NULL -Indonesia NULL -India NULL -Iraq NULL -Iran NULL -Italy NULL -Yemen NULL -Yugoslavia NULL -Cambodia NULL -Cameroon NULL -Kazakstan NULL -Kenya NULL -China NULL -Colombia NULL -Congo, The Democratic Republic of the NULL -North Korea NULL -South Korea NULL -Greece NULL -Cuba NULL -Madagascar NULL -Malawi NULL -Mali NULL -Morocco NULL -Mexico NULL -Mozambique NULL -Myanmar NULL -Nepal NULL -Niger NULL -Nigeria NULL -Côte d?Ivoire NULL -Pakistan NULL -Peru NULL -Poland NULL -France NULL -Romania NULL -Germany NULL -Saudi Arabia NULL -Somalia NULL -Sri Lanka NULL -Sudan NULL -Syria NULL -Taiwan NULL -Tanzania NULL -Thailand NULL -Czech Republic NULL -Turkey NULL -Uganda NULL -Ukraine NULL -Hungary NULL -Uzbekistan NULL -Belarus NULL -Venezuela NULL -Russian Federation NULL -Vietnam NULL -set join_buffer_size=256; -show variables like 'join_buffer_size'; -Variable_name Value -join_buffer_size 256 -set join_cache_level=3; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 3 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.CountryLanguage.Country 239 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE City hash_ALL Country #hash#Country 3 world.CountryLanguage.Country 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -set join_cache_level=4; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 4 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.CountryLanguage.Country 239 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE City hash_ALL Country #hash#Country 3 world.CountryLanguage.Country 4079 Using where; Using join buffer (incremental, BNLH join) -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join) -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -set join_cache_level=5; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 5 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE City ref Country Country 3 world.CountryLanguage.Country 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -set join_cache_level=6; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 6 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE City ref Country Country 3 world.CountryLanguage.Country 18 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -set join_cache_level=7; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 7 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -1 SIMPLE City ref Country Country 3 world.CountryLanguage.Country 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -set join_cache_level=8; -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 8 -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -EXPLAIN -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -1 SIMPLE City ref Country Country 3 world.CountryLanguage.Country 18 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name, CountryLanguage.Language -FROM City,Country,CountryLanguage -WHERE City.Country=Country.Code AND -CountryLanguage.Country=Country.Code AND -City.Name LIKE 'L%' AND Country.Population > 3000000 AND -CountryLanguage.Percentage > 50 AND -LENGTH(Language) < LENGTH(City.Name) - 2; -Name Name Language -La Matanza Argentina Spanish -Lomas de Zamora Argentina Spanish -Lauro de Freitas Brazil Portuguese -Los Angeles Chile Spanish -Las Palmas de Gran Canaria Spain Spanish -L´Hospitalet de Llobregat Spain Spanish -Lleida (Lérida) Spain Spanish -Liupanshui China Chinese -Lianyungang China Chinese -Liangcheng China Chinese -Lengshuijiang China Chinese -Lázaro Cárdenas Mexico Spanish -Lagos de Moreno Mexico Spanish -Las Margaritas Mexico Spanish -Lashio (Lasho) Myanmar Burmese -Lalitapur Nepal Nepali -Ludwigshafen am Rhein Germany German -Leverkusen Germany German -Luchou Taiwan Min -Lungtan Taiwan Min -Lower Hutt New Zealand English -Los Teques Venezuela Spanish -Leninsk-Kuznetski Russian Federation Russian -Los Angeles United States English -Long Beach United States English -Lexington-Fayette United States English -Louisville United States English -Little Rock United States English -EXPLAIN -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan -1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT Name FROM City -WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND -City.Population > 100000; -Name -Vientiane -Riga -Daugavpils -Maseru -Beirut -Tripoli -Monrovia -Tripoli -Bengasi -Misrata -Vilnius -Kaunas -Klaipeda -?iauliai -Panevezys -set join_cache_level=default; -set join_buffer_size=default; -show variables like 'join_buffer_size'; -Variable_name Value -join_buffer_size 262144 -show variables like 'join_cache_level'; -Variable_name Value -join_cache_level 2 -set join_cache_level=1; -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND City.Population > 3000000; -Name Name -Sydney Australia -Dhaka Bangladesh -São Paulo Brazil -Rio de Janeiro Brazil -London United Kingdom -Santiago de Chile Chile -Cairo Egypt -Alexandria Egypt -Jakarta Indonesia -Mumbai (Bombay) India -Delhi India -Calcutta [Kolkata] India -Chennai (Madras) India -Baghdad Iraq -Teheran Iran -Tokyo Japan -Jokohama [Yokohama] Japan -Shanghai China -Peking China -Chongqing China -Tianjin China -Wuhan China -Harbin China -Shenyang China -Kanton [Guangzhou] China -Chengdu China -Santafé de Bogotá Colombia -Kinshasa Congo, The Democratic Republic of the -Seoul South Korea -Pusan South Korea -Ciudad de México Mexico -Rangoon (Yangon) Myanmar -Karachi Pakistan -Lahore Pakistan -Lima Peru -Berlin Germany -Riyadh Saudi Arabia -Singapore Singapore -Bangkok Thailand -Istanbul Turkey -Ankara Turkey -Moscow Russian Federation -St Petersburg Russian Federation -Ho Chi Minh City Vietnam -New York United States -Los Angeles United States -set join_cache_level=8; -set join_buffer_size=384; -EXPLAIN -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND City.Population > 3000000; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE City range Population,Country Population 4 NULL # Using index condition; Rowid-ordered scan -1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country # Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND City.Population > 3000000; -Name Name -Alexandria Egypt -Ankara Turkey -Baghdad Iraq -Bangkok Thailand -Berlin Germany -Cairo Egypt -Calcutta [Kolkata] India -Chengdu China -Chennai (Madras) India -Chongqing China -Ciudad de México Mexico -Delhi India -Dhaka Bangladesh -Harbin China -Ho Chi Minh City Vietnam -Istanbul Turkey -Jakarta Indonesia -Jokohama [Yokohama] Japan -Kanton [Guangzhou] China -Karachi Pakistan -Kinshasa Congo, The Democratic Republic of the -Lahore Pakistan -Lima Peru -London United Kingdom -Los Angeles United States -Moscow Russian Federation -Mumbai (Bombay) India -New York United States -Peking China -Pusan South Korea -Rangoon (Yangon) Myanmar -Rio de Janeiro Brazil -Riyadh Saudi Arabia -Santafé de Bogotá Colombia -Santiago de Chile Chile -Seoul South Korea -Shanghai China -Shenyang China -Singapore Singapore -St Petersburg Russian Federation -Sydney Australia -São Paulo Brazil -Teheran Iran -Tianjin China -Tokyo Japan -Wuhan China -set join_buffer_size=default; -set join_cache_level=6; -ALTER TABLE Country MODIFY Name varchar(52) NOT NULL default ''; -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -ALTER TABLE Country MODIFY Name varchar(300) NOT NULL default ''; -SELECT City.Name, Country.Name FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name -Vientiane Laos -Riga Latvia -Daugavpils Latvia -Maseru Lesotho -Beirut Lebanon -Tripoli Lebanon -Monrovia Liberia -Tripoli Libyan Arab Jamahiriya -Bengasi Libyan Arab Jamahiriya -Misrata Libyan Arab Jamahiriya -Vilnius Lithuania -Kaunas Lithuania -Klaipeda Lithuania -?iauliai Lithuania -Panevezys Lithuania -ALTER TABLE Country ADD COLUMN PopulationBar text; -UPDATE Country -SET PopulationBar=REPEAT('x', CAST(Population/100000 AS unsigned int)); -SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name PopulationBar -Vientiane Laos xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Riga Latvia xxxxxxxxxxxxxxxxxxxxxxxx -Daugavpils Latvia xxxxxxxxxxxxxxxxxxxxxxxx -Maseru Lesotho xxxxxxxxxxxxxxxxxxxxxx -Beirut Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Tripoli Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Monrovia Liberia xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Tripoli Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Bengasi Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Misrata Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Vilnius Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Kaunas Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Klaipeda Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -?iauliai Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Panevezys Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -set join_buffer_size=256; -SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country -WHERE City.Country=Country.Code AND -Country.Name LIKE 'L%' AND City.Population > 100000; -Name Name PopulationBar -Vientiane Laos xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Riga Latvia xxxxxxxxxxxxxxxxxxxxxxxx -Daugavpils Latvia xxxxxxxxxxxxxxxxxxxxxxxx -Maseru Lesotho xxxxxxxxxxxxxxxxxxxxxx -Beirut Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Tripoli Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Monrovia Liberia xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Tripoli Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Bengasi Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Misrata Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Vilnius Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Kaunas Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Klaipeda Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -?iauliai Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -Panevezys Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -set join_cache_level=default; -set join_buffer_size=default; -DROP DATABASE world; -use test; -CREATE TABLE t1( -affiliatetometaid int NOT NULL default '0', -uniquekey int NOT NULL default '0', -metaid int NOT NULL default '0', -affiliateid int NOT NULL default '0', -xml text, -isactive char(1) NOT NULL default 'Y', -PRIMARY KEY (affiliatetometaid) -); -CREATE UNIQUE INDEX t1_uniquekey ON t1(uniquekey); -CREATE INDEX t1_affiliateid ON t1(affiliateid); -CREATE INDEX t1_metaid on t1 (metaid); -INSERT INTO t1 VALUES -(1616, 1571693233, 1391, 2, NULL, 'Y'), (1943, 1993216749, 1726, 2, NULL, 'Y'); -CREATE TABLE t2( -metaid int NOT NULL default '0', -name varchar(80) NOT NULL default '', -dateadded timestamp NOT NULL , -xml text, -status int default NULL, -origin int default NULL, -gid int NOT NULL default '1', -formattypeid int default NULL, -PRIMARY KEY (metaid) -); -CREATE INDEX t2_status ON t2(status); -CREATE INDEX t2_gid ON t2(gid); -CREATE INDEX t2_formattypeid ON t2(formattypeid); -INSERT INTO t2 VALUES -(1391, "I Just Died", "2003-10-02 10:07:37", "", 1, NULL, 3, NULL), -(1726, "Me, Myself & I", "2003-12-05 11:24:36", " ", 1, NULL, 3, NULL); -CREATE TABLE t3( -mediaid int NOT NULL , -metaid int NOT NULL default '0', -formatid int NOT NULL default '0', -status int default NULL, -path varchar(100) NOT NULL default '', -datemodified timestamp NOT NULL , -resourcetype int NOT NULL default '1', -parameters text, -signature int default NULL, -quality int NOT NULL default '255', -PRIMARY KEY (mediaid) -); -CREATE INDEX t3_metaid ON t3(metaid); -CREATE INDEX t3_formatid ON t3(formatid); -CREATE INDEX t3_status ON t3(status); -CREATE INDEX t3_metaidformatid ON t3(metaid,formatid); -CREATE INDEX t3_signature ON t3(signature); -CREATE INDEX t3_quality ON t3(quality); -INSERT INTO t3 VALUES -(6, 4, 8, 0, "010101_anastacia_spmidi.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255), -(3343, 3, 8, 1, "010102_4VN4bsPwnxRQUJW5Zp1RhG2IL9vvl_8.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255); -CREATE TABLE t4( -formatid int NOT NULL , -name varchar(60) NOT NULL default '', -formatclassid int NOT NULL default '0', -mime varchar(60) default NULL, -extension varchar(10) default NULL, -priority int NOT NULL default '0', -canaddtocapability char(1) NOT NULL default 'Y', -PRIMARY KEY (formatid) -); -CREATE INDEX t4_formatclassid ON t4(formatclassid); -CREATE INDEX t4_formats_idx ON t4(canaddtocapability); -INSERT INTO t4 VALUES -(19, "XHTML", 11, "text/html", "xhtml", 10, 'Y'), -(54, "AMR (wide band)", 13, "audio/amr-wb", "awb", 0, 'Y'); -CREATE TABLE t5( -formatclassid int NOT NULL , -name varchar(60) NOT NULL default '', -priority int NOT NULL default '0', -formattypeid int NOT NULL default '0', -PRIMARY KEY (formatclassid) -); -CREATE INDEX t5_formattypeid on t5(formattypeid); -INSERT INTO t5 VALUES -(11, "Info", 0, 4), (13, "Digital Audio", 0, 2); -CREATE TABLE t6( -formattypeid int NOT NULL , -name varchar(60) NOT NULL default '', -priority int default NULL, -PRIMARY KEY (formattypeid) -); -INSERT INTO t6 VALUES -(2, "Ringtones", 0); -CREATE TABLE t7( -metaid int NOT NULL default '0', -artistid int NOT NULL default '0', -PRIMARY KEY (metaid,artistid) -); -INSERT INTO t7 VALUES -(4, 5), (3, 4); -CREATE TABLE t8( -artistid int NOT NULL , -name varchar(80) NOT NULL default '', -PRIMARY KEY (artistid) -); -INSERT INTO t8 VALUES -(5, "Anastacia"), (4, "John Mayer"); -CREATE TABLE t9( -subgenreid int NOT NULL default '0', -metaid int NOT NULL default '0', -PRIMARY KEY (subgenreid,metaid) -) ; -CREATE INDEX t9_subgenreid ON t9(subgenreid); -CREATE INDEX t9_metaid ON t9(metaid); -INSERT INTO t9 VALUES -(138, 4), (31, 3); -CREATE TABLE t10( -subgenreid int NOT NULL , -genreid int NOT NULL default '0', -name varchar(80) NOT NULL default '', -PRIMARY KEY (subgenreid) -) ; -CREATE INDEX t10_genreid ON t10(genreid); -INSERT INTO t10 VALUES -(138, 19, ''), (31, 3, ''); -CREATE TABLE t11( -genreid int NOT NULL default '0', -name char(80) NOT NULL default '', -priority int NOT NULL default '0', -masterclip char(1) default NULL, -PRIMARY KEY (genreid) -) ; -CREATE INDEX t11_masterclip ON t11( masterclip); -INSERT INTO t11 VALUES -(19, "Pop & Dance", 95, 'Y'), (3, "Rock & Alternative", 100, 'Y'); -set join_cache_level=6; -EXPLAIN -SELECT t1.uniquekey, t1.xml AS affiliateXml, -t8.name AS artistName, t8.artistid, -t11.name AS genreName, t11.genreid, t11.priority AS genrePriority, -t10.subgenreid, t10.name AS subgenreName, -t2.name AS metaName, t2.metaid, t2.xml AS metaXml, -t4.priority + t5.priority + t6.priority AS overallPriority, -t3.path AS path, t3.mediaid, -t4.formatid, t4.name AS formatName, -t5.formatclassid, t5.name AS formatclassName, -t6.formattypeid, t6.name AS formattypeName -FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11 -WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND -t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND -t10.genreid = t11.genreid AND t3.metaid = t2.metaid AND -t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND -t4.canaddtocapability = 'Y' AND t5.formattypeid = t6.formattypeid AND -t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND -t1.metaid = t2.metaid AND t1.affiliateid = '2'; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t6 system PRIMARY NULL NULL NULL 1 -1 SIMPLE t1 ref t1_affiliateid,t1_metaid t1_affiliateid 4 const 1 -1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.metaid 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t7 ref PRIMARY PRIMARY 4 test.t1.metaid 1 Using index -1 SIMPLE t8 eq_ref PRIMARY PRIMARY 4 test.t7.artistid 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t3 ref t3_metaid,t3_formatid,t3_metaidformatid t3_metaidformatid 4 test.t1.metaid 1 Using index condition; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t4 eq_ref PRIMARY,t4_formatclassid,t4_formats_idx PRIMARY 4 test.t3.formatid 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t5 eq_ref PRIMARY,t5_formattypeid PRIMARY 4 test.t4.formatclassid 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t9 index PRIMARY,t9_subgenreid,t9_metaid PRIMARY 8 NULL 2 Using where; Using index; Using join buffer (incremental, BNL join) -1 SIMPLE t10 eq_ref PRIMARY,t10_genreid PRIMARY 4 test.t9.subgenreid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t11 eq_ref PRIMARY PRIMARY 4 test.t10.genreid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -SELECT t1.uniquekey, t1.xml AS affiliateXml, -t8.name AS artistName, t8.artistid, -t11.name AS genreName, t11.genreid, t11.priority AS genrePriority, -t10.subgenreid, t10.name AS subgenreName, -t2.name AS metaName, t2.metaid, t2.xml AS metaXml, -t4.priority + t5.priority + t6.priority AS overallPriority, -t3.path AS path, t3.mediaid, -t4.formatid, t4.name AS formatName, -t5.formatclassid, t5.name AS formatclassName, -t6.formattypeid, t6.name AS formattypeName -FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11 -WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND -t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND -t10.genreid = t11.genreid AND t3.metaid = t2.metaid AND -t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND -t4.canaddtocapability = 'Y' AND t5.formattypeid = t6.formattypeid AND -t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND -t1.metaid = t2.metaid AND t1.affiliateid = '2'; -uniquekey affiliateXml artistName artistid genreName genreid genrePriority subgenreid subgenreName metaName metaid metaXml overallPriority path mediaid formatid formatName formatclassid formatclassName formattypeid formattypeName -DROP TABLE t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11; -CREATE TABLE t1 (a1 int, filler1 char(64) default ' ' ); -CREATE TABLE t2 ( -a2 int, b2 int, filler2 char(64) default ' ', -PRIMARY KEY idx(a2,b2,filler2) -) ; -CREATE TABLE t3 (b3 int, c3 int, INDEX idx(b3)); -INSERT INTO t1(a1) VALUES -(4), (7), (1), (9), (8), (5), (3), (6), (2); -INSERT INTO t2(a2,b2) VALUES -(1,30), (3,40), (2,61), (6,73), (8,92), (9,27), (4,18), (5,84), (7,56), -(4,14), (6,76), (8,98), (7,55), (1,39), (2,68), (3,45), (9,21), (5,81), -(5,88), (2,65), (6,74), (9,23), (1,37), (3,44), (4,17), (8,99), (7,51), -(9,28), (7,52), (1,33), (4,13), (5,87), (3,43), (8,91), (2,62), (6,79), -(3,49), (8,93), (7,34), (5,82), (6,78), (2,63), (1,32), (9,22), (4,11); -INSERT INTO t3 VALUES -(30,302), (92,923), (18,187), (45,459), (30,309), -(39,393), (68,685), (45,458), (21,210), (81,817), -(40,405), (61,618), (73,738), (92,929), (27,275), -(18,188), (84,846), (56,564), (14,144), (76,763), -(98,982), (55,551), (17,174), (99,998), (51,513), -(28,282), (52,527), (33,336), (13,138), (87,878), -(43,431), (91,916), (62,624), (79,797), (49,494), -(93,933), (34,347), (82,829), (78,780), (63,634), -(32,329), (22,228), (11,114), (74,749), (23,236); -set join_cache_level=1; -EXPLAIN -SELECT a1<>a2, a1, a2, b2, b3, c3, -SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2 -FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using where -1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a1 1 Using index -1 SIMPLE t3 ref idx idx 5 test.t2.b2 5 Using where -SELECT a1<>a2, a1, a2, b2, b3, c3, -SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2 -FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7; -a1<>a2 a1 a2 b2 b3 c3 s1 s2 -0 4 4 13 13 138 -0 4 4 18 18 188 -0 1 1 30 30 309 -0 1 1 32 32 329 -0 9 9 22 22 228 -0 8 8 92 92 929 -0 8 8 99 99 998 -0 5 5 82 82 829 -0 5 5 87 87 878 -0 3 3 45 45 459 -0 3 3 45 45 458 -0 6 6 73 73 738 -0 6 6 74 74 749 -0 2 2 61 61 618 -set join_cache_level=5; -set join_buffer_size=512; -EXPLAIN -SELECT a1<>a2, a1, a2, b2, b3, c3, -SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2 -FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using where -1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a1 1 Using index -1 SIMPLE t3 ref idx idx 5 test.t2.b2 5 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT a1<>a2, a1, a2, b2, b3, c3, -SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2 -FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7; -a1<>a2 a1 a2 b2 b3 c3 s1 s2 -0 4 4 18 18 188 -0 4 4 13 13 138 -0 1 1 30 30 309 -0 1 1 32 32 329 -0 9 9 22 22 228 -0 8 8 92 92 929 -0 8 8 99 99 998 -0 5 5 82 82 829 -0 3 3 45 45 459 -0 3 3 45 45 458 -0 5 5 87 87 878 -0 2 2 61 61 618 -0 6 6 73 73 738 -0 6 6 74 74 749 -DROP TABLE t1,t2,t3; -CREATE TABLE t1 (a int, b int, INDEX idx(b)); -CREATE TABLE t2 (a int, b int, INDEX idx(a)); -INSERT INTO t1 VALUES (5,30), (3,20), (7,40), (2,10), (8,30), (1,10), (4,20); -INSERT INTO t2 VALUES (7,10), (1,20), (2,20), (8,20), (8,10), (1,20); -INSERT INTO t2 VALUES (1,10), (4,20), (3,20), (7,20), (7,10), (1,20); -INSERT INTO t2 VALUES (17,10), (11,20), (12,20), (18,20), (18,10), (11,20); -INSERT INTO t2 VALUES (11,10), (14,20), (13,20), (17,20), (17,10), (11,20); -set join_buffer_size=32; -Warnings: -Warning 1292 Truncated incorrect join_buffer_size value: '32' -set join_cache_level=8; -EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL idx NULL NULL NULL 7 Using where -1 SIMPLE t2 ref idx idx 5 test.t1.a 2 Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30; -a b a b -7 40 7 10 -7 40 7 10 -7 40 7 20 -8 30 8 10 -8 30 8 20 -DROP TABLE t1,t2; -# -# Bug #40134: outer join with not exists optimization and join buffer -# -set join_cache_level=default; -set join_buffer_size=default; -CREATE TABLE t1 (a int NOT NULL); -INSERT INTO t1 VALUES (2), (4), (3), (5), (1); -CREATE TABLE t2 (a int NOT NULL, b int NOT NULL, INDEX i_a(a)); -INSERT INTO t2 VALUES (4,10), (2,10), (2,30), (2,20), (4,20); -INSERT INTO t2 VALUES (14,10), (12,10), (15,30), (12,20), (14,20); -EXPLAIN -SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 5 -1 SIMPLE t2 ref i_a i_a 4 test.t1.a 2 Using where; Not exists -SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL; -a a b -3 NULL NULL -5 NULL NULL -1 NULL NULL -SET join_cache_level=6; -EXPLAIN -SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 5 -1 SIMPLE t2 ref i_a i_a 4 test.t1.a 2 Using where; Not exists; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL; -a a b -3 NULL NULL -5 NULL NULL -1 NULL NULL -DROP TABLE t1, t2; -set join_cache_level=default; -set join_buffer_size=default; -# -# BUG#40136: Group by is ignored when join buffer is used for an outer join -# -create table t1(a int PRIMARY KEY, b int); -insert into t1 values -(5, 10), (2, 70), (7, 80), (6, 20), (1, 50), (9, 40), (8, 30), (3, 60); -create table t2 (p int, a int, INDEX i_a(a)); -insert into t2 values -(103, 7), (109, 3), (102, 3), (108, 1), (106, 3), -(107, 7), (105, 1), (101, 3), (100, 7), (110, 1); -set @save_join_cache_level=@@join_cache_level; -set join_cache_level=6; -The following must not show "using join cache": -explain -select t1.a, count(t2.p) as count -from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 index NULL PRIMARY 4 NULL 8 Using index; Using temporary; Using filesort -1 SIMPLE t2 ref i_a i_a 5 test.t1.a 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -select t1.a, count(t2.p) as count -from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a; -a count -1 1 -2 0 -3 2 -5 0 -6 0 -7 2 -8 0 -9 0 -set join_cache_level=@save_join_cache_level; -drop table t1, t2; -# -# BUG#40268: Nested outer join with not null-rejecting where condition -# over an inner table which is not the last in the nest -# -CREATE TABLE t2 (a int, b int, c int); -CREATE TABLE t3 (a int, b int, c int); -CREATE TABLE t4 (a int, b int, c int); -INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0); -INSERT INTO t3 VALUES (1,2,0), (2,2,0); -INSERT INTO t4 VALUES (3,2,0), (4,2,0); -set join_cache_level=6; -SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b -FROM t2 LEFT JOIN (t3, t4) ON t2.b=t4.b -WHERE t3.a+2<t2.a OR t3.c IS NULL; -a b a b a b -4 2 1 2 3 2 -4 2 1 2 4 2 -3 3 NULL NULL NULL NULL -5 3 NULL NULL NULL NULL -set join_cache_level=default; -DROP TABLE t2, t3, t4; -# -# Bug #40192: outer join with where clause when using BNL -# -create table t1 (a int, b int); -insert into t1 values (2, 20), (3, 30), (1, 10); -create table t2 (a int, c int); -insert into t2 values (1, 101), (3, 102), (1, 100); -set join_cache_level=6; -select * from t1 left join t2 on t1.a=t2.a; -a b a c -1 10 1 101 -3 30 3 102 -1 10 1 100 -2 20 NULL NULL -explain select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 -1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t1.a 3 Using where; Using join buffer (flat, BNLH join) -select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null; -a b a c -3 30 3 102 -2 20 NULL NULL -set join_cache_level=default; -drop table t1, t2; -# -# Bug #40317: outer join with with constant on expression equal to FALSE -# -create table t1 (a int); -insert into t1 values (30), (40), (20); -create table t2 (b int); -insert into t2 values (200), (100); -set join_cache_level=6; -select * from t1 left join t2 on (1=0); -a b -30 NULL -40 NULL -20 NULL -explain select * from t1 left join t2 on (1=0) where a=40; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join) -select * from t1 left join t2 on (1=0) where a=40; -a b -40 NULL -set join_cache_level=0; -explain select * from t1 left join t2 on (1=0); -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where -set join_cache_level=default; -drop table t1, t2; -# -# Bug #41204: small buffer with big rec_per_key for ref access -# -CREATE TABLE t1 (a int); -INSERT INTO t1 VALUES (0); -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1(a) SELECT a FROM t1; -INSERT INTO t1 VALUES (20000), (10000); -CREATE TABLE t2 (pk int AUTO_INCREMENT PRIMARY KEY, b int, c int, INDEX idx(b)); -INSERT INTO t2(b,c) VALUES (10000, 3), (20000, 7), (20000, 1), (10000, 9), (20000, 5); -INSERT INTO t2(b,c) SELECT b,c FROM t2; -INSERT INTO t2(b,c) SELECT b,c FROM t2; -INSERT INTO t2(b,c) SELECT b,c FROM t2; -INSERT INTO t2(b,c) SELECT b,c FROM t2; -INSERT INTO t2(b,c) SELECT b,c FROM t2; -INSERT INTO t2(b,c) SELECT b,c FROM t2; -INSERT INTO t2(b,c) SELECT b,c FROM t2; -INSERT INTO t2(b,c) SELECT b,c FROM t2; -ANALYZE TABLE t1,t2; -set join_cache_level=6; -set join_buffer_size=1024; -EXPLAIN SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2050 Using where -1 SIMPLE t2 ref idx idx 5 test.t1.a 640 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b; -AVG(c) -5.0000 -set join_buffer_size=default; -set join_cache_level=default; -DROP TABLE t1, t2; -# -# Bug #41894: big join buffer of level 7 used to join records -# with null values in place of varchar strings -# -CREATE TABLE t1 (a int NOT NULL AUTO_INCREMENT PRIMARY KEY, -b varchar(127) DEFAULT NULL); -INSERT INTO t1(a) VALUES (1); -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -INSERT INTO t1(b) SELECT b FROM t1; -CREATE TABLE t2 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL); -INSERT INTO t2 SELECT * FROM t1; -CREATE TABLE t3 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL); -INSERT INTO t3 SELECT * FROM t1; -set join_cache_level=7; -set join_buffer_size=1024*1024; -EXPLAIN -SELECT COUNT(*) FROM t1,t2,t3 -WHERE t1.a=t2.a AND t2.a=t3.a AND -t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 16384 Using where -1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT COUNT(*) FROM t1,t2,t3 -WHERE t1.a=t2.a AND t2.a=t3.a AND -t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL; -COUNT(*) -16384 -set join_buffer_size=default; -set join_cache_level=default; -DROP TABLE t1,t2,t3; -# -# Bug #42020: join buffer is used for outer join with fields of -# several outer tables in join buffer -# -CREATE TABLE t1 ( -a bigint NOT NULL, -PRIMARY KEY (a) -); -INSERT INTO t1 VALUES -(2), (1); -CREATE TABLE t2 ( -a bigint NOT NULL, -b bigint NOT NULL, -PRIMARY KEY (a,b) -); -INSERT INTO t2 VALUES -(2,30), (2,40), (2,50), (2,60), (2,70), (2,80), -(1,10), (1, 20), (1,30), (1,40), (1,50); -CREATE TABLE t3 ( -pk bigint NOT NULL AUTO_INCREMENT, -a bigint NOT NULL, -b bigint NOT NULL, -val bigint DEFAULT '0', -PRIMARY KEY (pk), -KEY idx (a,b) -); -INSERT INTO t3(a,b) VALUES -(2,30), (2,40), (2,50), (2,60), (2,70), (2,80), -(4,30), (4,40), (4,50), (4,60), (4,70), (4,80), -(5,30), (5,40), (5,50), (5,60), (5,70), (5,80), -(7,30), (7,40), (7,50), (7,60), (7,70), (7,80); -set join_cache_level=0; -SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val -FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) -WHERE t1.a=t2.a; -a a a b b val -1 1 NULL 10 NULL NULL -1 1 NULL 20 NULL NULL -1 1 NULL 30 NULL NULL -1 1 NULL 40 NULL NULL -1 1 NULL 50 NULL NULL -2 2 2 30 30 0 -2 2 2 40 40 0 -2 2 2 50 50 0 -2 2 2 60 60 0 -2 2 2 70 70 0 -2 2 2 80 80 0 -set join_cache_level=6; -set join_buffer_size=256; -EXPLAIN -SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val -FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) -WHERE t1.a=t2.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 2 Using index -1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a 1 Using index -1 SIMPLE t3 ref idx idx 16 test.t1.a,test.t2.b 2 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val -FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) -WHERE t1.a=t2.a; -a a a b b val -1 1 NULL 10 NULL NULL -1 1 NULL 20 NULL NULL -1 1 NULL 30 NULL NULL -1 1 NULL 40 NULL NULL -1 1 NULL 50 NULL NULL -2 2 2 30 30 0 -2 2 2 40 40 0 -2 2 2 50 50 0 -2 2 2 60 60 0 -2 2 2 70 70 0 -2 2 2 80 80 0 -DROP INDEX idx ON t3; -set join_cache_level=2; -EXPLAIN -SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val -FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) -WHERE t1.a=t2.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 2 Using index -1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a 1 Using index -1 SIMPLE t3 ALL NULL NULL NULL NULL 24 Using where; Using join buffer (flat, BNL join) -SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val -FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) -WHERE t1.a=t2.a; -a a a b b val -1 1 NULL 10 NULL NULL -1 1 NULL 20 NULL NULL -1 1 NULL 30 NULL NULL -1 1 NULL 40 NULL NULL -1 1 NULL 50 NULL NULL -2 2 2 30 30 0 -2 2 2 40 40 0 -2 2 2 50 50 0 -2 2 2 60 60 0 -2 2 2 70 70 0 -2 2 2 80 80 0 -set join_buffer_size=default; -set join_cache_level=default; -DROP TABLE t1,t2,t3; -create table t1(f1 int, f2 int); -insert into t1 values (1,1),(2,2),(3,3); -create table t2(f1 int not null, f2 int not null, f3 char(200), key(f1,f2)); -insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty'); -insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'), -(2,4, 'qwerty'),(2,5, 'qwerty'); -insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty'); -insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'), -(4,4, 'qwerty'); -insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty'); -insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'), -(2,4, 'qwerty'),(2,5, 'qwerty'); -insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty'); -insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'), -(4,4, 'qwerty'); -flush status; -set join_cache_level=5; -select t2.f1, t2.f2, t2.f3 from t1,t2 -where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1; -f1 f2 f3 -1 1 qwerty -2 2 qwerty -1 1 qwerty -2 2 qwerty -explain select t2.f1, t2.f2, t2.f3 from t1,t2 -where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where -1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -show status like "Handler_icp%"; -Variable_name Value -Handler_icp_attempts 20 -Handler_icp_match 4 -set join_cache_level=6; -select t2.f1, t2.f2, t2.f3 from t1,t2 -where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1; -f1 f2 f3 -1 1 qwerty -2 2 qwerty -1 1 qwerty -2 2 qwerty -explain select t2.f1, t2.f2, t2.f3 from t1,t2 -where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where -1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -show status like "Handler_icp%"; -Variable_name Value -Handler_icp_attempts 40 -Handler_icp_match 8 -set join_cache_level=7; -select t2.f1, t2.f2, t2.f3 from t1,t2 -where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1; -f1 f2 f3 -1 1 qwerty -2 2 qwerty -1 1 qwerty -2 2 qwerty -explain select t2.f1, t2.f2, t2.f3 from t1,t2 -where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where -1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -show status like "Handler_icp%"; -Variable_name Value -Handler_icp_attempts 60 -Handler_icp_match 12 -set join_cache_level=8; -select t2.f1, t2.f2, t2.f3 from t1,t2 -where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1; -f1 f2 f3 -1 1 qwerty -2 2 qwerty -1 1 qwerty -2 2 qwerty -explain select t2.f1, t2.f2, t2.f3 from t1,t2 -where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where -1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -show status like "Handler_icp%"; -Variable_name Value -Handler_icp_attempts 80 -Handler_icp_match 16 -drop table t1,t2; -set join_cache_level=default; -# -# Bug #42955: join with GROUP BY/ORDER BY and when BKA is enabled -# -create table t1 (d int, id1 int, index idx1 (d, id1)); -insert into t1 values -(3, 20), (2, 40), (3, 10), (1, 10), (3, 20), (1, 40), (2, 30), (3, 30); -create table t2 (id1 int, id2 int, index idx2 (id1)); -insert into t2 values -(20, 100), (30, 400), (20, 400), (30, 200), (10, 300), (10, 200), (40, 100), -(40, 200), (30, 300), (10, 400), (20, 200), (20, 300); -insert into t2 values -(21, 10), (31, 400), (21, 400), (31, 200), (11, 300), (11, 200), (41, 100), -(41, 200), (31, 300), (11, 400), (21, 200), (21, 300); -set join_cache_level=6; -explain -select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1 -where t1.d=3 group by t1.id1; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ref idx1 idx1 5 const 4 Using where; Using index; Using temporary; Using filesort -1 SIMPLE t2 ref idx2 idx2 5 test.t1.id1 2 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1 -where t1.d=3 group by t1.id1; -id1 sum(t2.id2) -10 900 -20 2000 -30 900 -explain -select t1.id1 from t1 join t2 on t1.id1=t2.id1 -where t1.d=3 and t2.id2 > 200 order by t1.id1; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ref idx1 idx1 5 const 4 Using where; Using index; Using temporary; Using filesort -1 SIMPLE t2 ref idx2 idx2 5 test.t1.id1 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -select t1.id1 from t1 join t2 on t1.id1=t2.id1 -where t1.d=3 and t2.id2 > 200 order by t1.id1; -id1 -10 -10 -20 -20 -20 -20 -30 -30 -set join_cache_level=default; -drop table t1,t2; -# -# Bug #44019: star-like multi-join query executed join_cache_level=6 -# -create table t1 (a int, b int, c int, d int); -create table t2 (b int, e varchar(16), index idx(b)); -create table t3 (d int, f varchar(16), index idx(d)); -create table t4 (c int, g varchar(16), index idx(c)); -insert into t1 values -(5, 50, 500, 5000), (3, 30, 300, 3000), (9, 90, 900, 9000), -(2, 20, 200, 2000), (4, 40, 400, 4000), (8, 80, 800, 800), -(7, 70, 700, 7000); -insert into t2 values -(30, 'bbb'), (10, 'b'), (70, 'bbbbbbb'), (60, 'bbbbbb'), -(31, 'bbb'), (11, 'b'), (71, 'bbbbbbb'), (61, 'bbbbbb'), -(32, 'bbb'), (12, 'b'), (72, 'bbbbbbb'), (62, 'bbbbbb'); -insert into t2 values -(130, 'bbb'), (110, 'b'), (170, 'bbbbbbb'), (160, 'bbbbbb'), -(131, 'bbb'), (111, 'b'), (171, 'bbbbbbb'), (161, 'bbbbbb'), -(132, 'bbb'), (112, 'b'), (172, 'bbbbbbb'), (162, 'bbbbbb'); -insert into t3 values -(4000, 'dddd'), (3000, 'ddd'), (1000, 'd'), (8000, 'dddddddd'), -(4001, 'dddd'), (3001, 'ddd'), (1001, 'd'), (8001, 'dddddddd'), -(4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd'); -insert into t3 values -(14000, 'dddd'), (13000, 'ddd'), (11000, 'd'), (18000, 'dddddddd'), -(14001, 'dddd'), (13001, 'ddd'), (11001, 'd'), (18001, 'dddddddd'), -(4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd'); -insert into t4 values -(200, 'cc'), (600, 'cccccc'), (300, 'ccc'), (500, 'ccccc'), -(201, 'cc'), (601, 'cccccc'), (301, 'ccc'), (501, 'ccccc'), -(202, 'cc'), (602, 'cccccc'), (302, 'ccc'), (502, 'ccccc'); -insert into t4 values -(1200, 'cc'), (1600, 'cccccc'), (1300, 'ccc'), (1500, 'ccccc'), -(1201, 'cc'), (1601, 'cccccc'), (1301, 'ccc'), (1501, 'ccccc'), -(1202, 'cc'), (1602, 'cccccc'), (1302, 'ccc'), (1502, 'ccccc'); -analyze table t2,t3,t4; -set join_cache_level=1; -explain -select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4 -where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where -1 SIMPLE t2 ref idx idx 5 test.t1.b 1 -1 SIMPLE t3 ref idx idx 5 test.t1.d 1 -1 SIMPLE t4 ref idx idx 5 test.t1.c 1 -select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4 -where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c; -a b c d e f g -3 30 300 3000 bbb ddd ccc -set join_cache_level=6; -explain -select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4 -where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where -1 SIMPLE t2 ref idx idx 5 test.t1.b 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t3 ref idx idx 5 test.t1.d 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t4 ref idx idx 5 test.t1.c 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4 -where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c; -a b c d e f g -3 30 300 3000 bbb ddd ccc -set join_cache_level=default; -drop table t1,t2,t3,t4; -# -# Bug #44250: Corruption of linked join buffers when using BKA -# -CREATE TABLE t1 ( -id1 bigint(20) DEFAULT NULL, -id2 bigint(20) DEFAULT NULL, -id3 bigint(20) DEFAULT NULL, -num1 bigint(20) DEFAULT NULL, -num2 int(11) DEFAULT NULL, -num3 bigint(20) DEFAULT NULL -); -CREATE TABLE t2 ( -id3 bigint(20) NOT NULL DEFAULT '0', -id4 bigint(20) DEFAULT NULL, -enum1 enum('Enabled','Disabled','Paused') DEFAULT NULL, -PRIMARY KEY (id3) -); -CREATE TABLE t3 ( -id4 bigint(20) NOT NULL DEFAULT '0', -text1 text, -PRIMARY KEY (id4) -); -CREATE TABLE t4 ( -id2 bigint(20) NOT NULL DEFAULT '0', -dummy int(11) DEFAULT '0', -PRIMARY KEY (id2) -); -CREATE TABLE t5 ( -id1 bigint(20) NOT NULL DEFAULT '0', -id2 bigint(20) NOT NULL DEFAULT '0', -enum2 enum('Active','Deleted','Paused') DEFAULT NULL, -PRIMARY KEY (id1,id2) -); -set join_cache_level=8; -set join_buffer_size=2048; -EXPLAIN -SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy -FROM t1 JOIN t2 JOIN t3 JOIN t4 JOIN t5 -WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and t4.id2=t1.id2 AND -t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D'; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 349 Using where -1 SIMPLE t2 eq_ref PRIMARY PRIMARY 8 test.t1.id3 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 8 test.t2.id4 1 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan -1 SIMPLE t4 eq_ref PRIMARY PRIMARY 8 test.t1.id2 1 Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 16 test.t1.id1,test.t1.id2 1 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan -SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy -FROM t1 JOIN t2 JOIN t3 JOIN t4 JOIN t5 -WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and t4.id2=t1.id2 AND -t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D'; -id1 num3 text1 id4 id3 dummy -228172702 14 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0 -228172702 134 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0 -228172702 15 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0 -228172702 3 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0 -228808822 61 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 13 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 60 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 13 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 6 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 18 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 17 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 50 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0 -228808822 89 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 19 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 9 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 84 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 14 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 10 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 26 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 28 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -228808822 62 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0 -set join_buffer_size=default; -set join_cache_level=default; -DROP TABLE t1,t2,t3,t4,t5; -# -# Bug#45267: Incomplete check caused wrong result. -# -CREATE TABLE t1 ( -`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY -); -CREATE TABLE t3 ( -`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY -); -INSERT INTO t3 VALUES -(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15), -(16),(17),(18),(19),(20); -CREATE TABLE t2 ( -`pk` int(11) NOT NULL AUTO_INCREMENT, -`int_nokey` int(11) NOT NULL, -`time_key` time NOT NULL, -PRIMARY KEY (`pk`), -KEY `time_key` (`time_key`) -); -INSERT INTO t2 VALUES (10,9,'22:36:46'),(11,0,'08:46:46'); -SELECT DISTINCT t1.`pk` -FROM t1 RIGHT JOIN t2 STRAIGHT_JOIN t3 ON t2.`int_nokey` ON t2.`time_key` -GROUP BY 1; -pk -NULL -DROP TABLE IF EXISTS t1, t2, t3; -# -# Bug #46328: Use of aggregate function without GROUP BY clause -# returns many rows (vs. one ) -# -CREATE TABLE t1 ( -int_key int(11) NOT NULL, -KEY int_key (int_key) -); -INSERT INTO t1 VALUES -(0),(2),(2),(2),(3),(4),(5),(5),(6),(6),(8),(8),(9),(9); -CREATE TABLE t2 ( -int_key int(11) NOT NULL, -KEY int_key (int_key) -); -INSERT INTO t2 VALUES (2),(3); - -# The query shall return 1 record with a max value 9 and one of the -# int_key values inserted above (undefined which one). A changed -# execution plan may change the value in the second column -SELECT MAX(t1.int_key), t1.int_key -FROM t1 STRAIGHT_JOIN t2 -ORDER BY t1.int_key; -MAX(t1.int_key) int_key -9 0 - -explain -SELECT MAX(t1.int_key), t1.int_key -FROM t1 STRAIGHT_JOIN t2 -ORDER BY t1.int_key; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 index NULL int_key 4 NULL 14 Using index -1 SIMPLE t2 index NULL int_key 4 NULL 2 Using index; Using join buffer (flat, BNL join) - -DROP TABLE t1,t2; -SET join_cache_level=default; -# -# Regression test for -# Bug#46733 - NULL value not returned for aggregate on empty result -# set w/ semijoin on -# -CREATE TABLE t1 ( -i int(11) NOT NULL, -v varchar(1) DEFAULT NULL, -PRIMARY KEY (i) -); -INSERT INTO t1 VALUES (10,'a'),(11,'b'),(12,'c'),(13,'d'); -CREATE TABLE t2 ( -i int(11) NOT NULL, -v varchar(1) DEFAULT NULL, -PRIMARY KEY (i) -); -INSERT INTO t2 VALUES (1,'x'),(2,'y'); - -SELECT MAX(t1.i) -FROM t1 JOIN t2 ON t2.v -ORDER BY t2.v; -MAX(t1.i) -NULL -Warnings: -Warning 1292 Truncated incorrect DOUBLE value: 'x' -Warning 1292 Truncated incorrect DOUBLE value: 'y' - -EXPLAIN -SELECT MAX(t1.i) -FROM t1 JOIN t2 ON t2.v -ORDER BY t2.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where -1 SIMPLE t1 index NULL PRIMARY 4 NULL 4 Using index; Using join buffer (flat, BNL join) - -DROP TABLE t1,t2; -# -# Bug #45092: join buffer contains two blob columns one of which is -# used in the key employed to access the joined table -# -CREATE TABLE t1 (c1 int, c2 int, key (c2)); -INSERT INTO t1 VALUES (1,1); -INSERT INTO t1 VALUES (2,2); -CREATE TABLE t2 (c1 text, c2 text); -INSERT INTO t2 VALUES('tt', 'uu'); -INSERT INTO t2 VALUES('zzzz', 'xxxxxxxxx'); -ANALYZE TABLE t1,t2; -set join_cache_level=6; -SELECT t1.*, t2.*, LENGTH(t2.c1), LENGTH(t2.c2) FROM t1,t2 -WHERE t1.c2=LENGTH(t2.c2) and t1.c1=LENGTH(t2.c1); -c1 c2 c1 c2 LENGTH(t2.c1) LENGTH(t2.c2) -2 2 tt uu 2 2 -set join_cache_level=default; -DROP TABLE t1,t2; -# -# Bug #51092: linked join buffer is used for a 3-way cross join query -# that selects only records of the first table -# -create table t1 (a int, b int); -insert into t1 values (1,1),(2,2); -create table t2 (a int, b int); -insert into t2 values (1,1),(2,2); -create table t3 (a int, b int); -insert into t3 values (1,1),(2,2); -set join_cache_level=1; -explain select t1.* from t1,t2,t3; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join) -1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join) -select t1.* from t1,t2,t3; -a b -1 1 -2 2 -1 1 -2 2 -1 1 -2 2 -1 1 -2 2 -set join_cache_level=2; -explain select t1.* from t1,t2,t3; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join) -1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using join buffer (incremental, BNL join) -select t1.* from t1,t2,t3; -a b -1 1 -2 2 -1 1 -2 2 -1 1 -2 2 -1 1 -2 2 -set join_cache_level=default; -drop table t1,t2,t3; -# -# Bug #52394: using join buffer for 3 table join with ref access -# LP #623209: and no references to the columns of the middle table -# -set join_cache_level=6; -CREATE TABLE t1 (a int(11), b varchar(1)); -INSERT INTO t1 VALUES (6,'r'),(27,'o'); -CREATE TABLE t2(a int); -INSERT INTO t2 VALUES(1),(2),(3),(4),(5); -CREATE TABLE t3 (a int(11) primary key, b varchar(1)); -INSERT INTO t3 VALUES -(14,'d'),(15,'z'),(16,'e'),(17,'h'),(18,'b'),(19,'s'),(20,'e'), -(21,'j'),(22,'e'),(23,'f'),(24,'v'),(25,'x'),(26,'m'),(27,'o'); -EXPLAIN -SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t2 ALL NULL NULL NULL NULL 5 Using join buffer (incremental, BNL join) -SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b; -a -27 -27 -27 -27 -27 -DROP TABLE t1,t2,t3; -set join_cache_level=default; -# -# Bug #51084: Batched key access crashes for SELECT with -# derived table and LEFT JOIN -# -CREATE TABLE t1 ( -carrier int, -id int PRIMARY KEY -); -INSERT INTO t1 VALUES (1,11),(1,12),(2,13); -CREATE TABLE t2 ( -scan_date int, -package_id int -); -INSERT INTO t2 VALUES (2008,21),(2008,22); -CREATE TABLE t3 ( -carrier int PRIMARY KEY, -id int -); -INSERT INTO t3 VALUES (1,31); -CREATE TABLE t4 ( -carrier_id int, -INDEX carrier_id(carrier_id) -); -INSERT INTO t4 VALUES (31),(32); -SET join_cache_level=8; -SELECT COUNT(*) -FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id) -ON t3.carrier = t1.carrier; -COUNT(*) -6 -EXPLAIN -SELECT COUNT(*) -FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id) -ON t3.carrier = t1.carrier; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 -1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join) -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.carrier 1 Using where -1 SIMPLE t4 ref carrier_id carrier_id 5 test.t3.id 2 Using index -SET join_cache_level=default; -DROP TABLE t1,t2,t3,t4; -# -# Bug #52636: allowing JOINs on NULL values w/ join_cache_level = 5-8 -# -CREATE TABLE t1 (b int); -INSERT INTO t1 VALUES (NULL),(3); -CREATE TABLE t2 (a int, b int, KEY (b)); -INSERT INTO t2 VALUES -(100,NULL),(150,200),(50,150),(250,350),(180,210),(100,150), -(101,NULL),(151,200),(51,150),(251,350),(181,210),(101,150); -set join_cache_level = 5; -explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ref b b 5 test.t1.b 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -a -NULL -NULL -set join_cache_level = 8; -explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ref b b 5 test.t1.b 2 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -a -NULL -NULL -delete from t1; -INSERT INTO t1 VALUES (NULL),(NULL); -set join_cache_level = 5; -explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ref b b 5 test.t1.b 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -a -NULL -NULL -DROP TABLE t1,t2; -CREATE TABLE t1 (b varchar(100)); -INSERT INTO t1 VALUES (NULL),("some varchar"); -CREATE TABLE t2 (a int, b varchar(100), KEY (b)); -INSERT INTO t2 VALUES (100,NULL),(150,"varchar"),(200,NULL),(250,"long long varchar"); -INSERT INTO t2 VALUES (100,NULL),(150,"long varchar"),(200,"varchar"),(250,"long long long varchar"); -set join_cache_level = 5; -explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ref b b 103 test.t1.b 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -a -NULL -NULL -set join_cache_level = 8; -explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ref b b 103 test.t1.b 2 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b; -a -NULL -NULL -set join_cache_level = default; -DROP TABLE t1,t2; -# -# Bug #54359: Extra rows with join_cache_level=7,8 and two joins -# and multi-column index" -# -CREATE TABLE t1 ( -pk int NOT NULL, -a int DEFAULT NULL, -b varchar(16) DEFAULT NULL, -c varchar(16) DEFAULT NULL, -INDEX idx (b,a)) -; -INSERT INTO t1 VALUES (4,9,'k','k'); -INSERT INTO t1 VALUES (12,5,'k','k'); -set join_cache_level = 8; -EXPLAIN -SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx) -WHERE s.pk AND s.a >= t.pk AND s.b = t.c; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t ALL NULL NULL NULL NULL 2 Using where -1 SIMPLE s ref idx idx 19 test.t.c 1 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan -SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx) -WHERE s.pk AND s.a >= t.pk AND s.b = t.c; -a -9 -9 -set join_cache_level = default; -DROP TABLE t1; -# -# Bug #54235: Extra rows with join_cache_level=6,8 and two LEFT JOINs -# -CREATE TABLE t1 (a int); -CREATE TABLE t2 (a int); -CREATE TABLE t3 (a int); -CREATE TABLE t4 (a int); -INSERT INTO t1 VALUES (null), (2), (null), (1); -set join_cache_level = 6; -EXPLAIN -SELECT t1.a -FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0 -WHERE t1.a OR t3.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 4 -1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join) -1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join) -SELECT t1.a -FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0 -WHERE t1.a OR t3.a; -a -2 -1 -EXPLAIN -SELECT t1.a -FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0 -WHERE t1.a OR t4.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 4 -1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join) -1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join) -SELECT t1.a -FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0 -WHERE t1.a OR t4.a; -a -2 -1 -set join_cache_level = default; -DROP TABLE t1,t2,t3,t4; -# -# Bug #663840: Memory overwrite causing crash with hash join -# -SET SESSION join_cache_level=3; -SET SESSION join_buffer_size=100; -Warnings: -Warning 1292 Truncated incorrect join_buffer_size value: '100' -CREATE TABLE t3 ( -i int NOT NULL, -j int NOT NULL, -d date NOT NULL, -t time NOT NULL, -v varchar(1) NOT NULL, -u varchar(1) NOT NULL, -INDEX idx (v) -) COLLATE=latin1_bin; -INSERT INTO t3 VALUES -(3,8,'2008-12-04','00:00:00','v','v'), (3,8,'2009-03-28','00:00:00','f','f'), -(3,5,'1900-01-01','00:55:47','v','v'), (2,8,'2009-10-02','00:00:00','s','s'), -(1,8,'1900-01-01','20:51:59','a','a'), (0,6,'2008-06-04','09:47:27','p','p'), -(8,7,'2009-01-13','21:58:29','z','z'), (5,2,'1900-01-01','22:45:53','a','a'), -(9,5,'2008-01-28','14:06:48','h','h'), (5,7,'2004-09-18','22:17:16','h','h'), -(4,2,'2006-10-14','14:59:37','v','v'), (2,9,'1900-01-01','23:37:40','v','v'), -(33,142,'2000-11-28','14:14:01','b','b'), (5,3,'2008-04-04','02:54:19','y','y'), -(1,0,'2002-07-13','06:34:26','v','v'), (9,3,'2003-01-03','18:07:38','m','m'), -(1,5,'2006-04-02','13:55:23','z','z'), (3,9,'2006-10-19','20:32:28','n','n'), -(8,1,'2005-06-08','11:57:44','d','d'), (231,107,'2006-12-26','03:10:35','a','a'); -INSERT INTO t3 VALUES -(103,108,'2008-12-04','00:00:00','a','v'), (103,108,'2009-03-28','00:00:00','b','f'), -(103,105,'1900-01-01','00:55:47','c','v'), (102,108,'2009-10-02','00:00:00','d','s'), -(100,108,'1900-01-01','20:51:59','e','a'), (100,106,'2008-06-04','09:47:27','f','p'), -(108,107,'2009-01-13','21:58:29','g','z'), (105,102,'1900-01-01','22:45:53','h','a'), -(109,105,'2008-01-28','14:06:48','i','h'), (105,107,'2004-09-18','22:17:16','j','h'), -(104,102,'2006-10-14','14:59:37','k','v'), (102,109,'1900-01-01','23:37:40','l','v'), -(1033,1142,'2000-11-28','14:14:01','m','b'), (105,103,'2008-04-04','02:54:19','n','y'), -(100,100,'2002-07-13','06:34:26','o','v'), (109,103,'2003-01-03','18:07:38','p','m'), -(100,105,'2006-04-02','13:55:23','q','z'), (103,109,'2006-10-19','20:32:28','s','n'), -(108,100,'2005-06-08','11:57:44','t','d'), (1231,1107,'2006-12-26','03:10:35','v','a'); -CREATE TABLE t1 SELECT * FROM t3; -DELETE FROM t1 WHERE i > 8; -CREATE TABLE t2 SELECT * FROM t3; -DELETE FROM t2 WHERE j > 10; -EXPLAIN -SELECT t1.i, t1.d, t1.v, t2.i, t2.d, t2.t, t2.v FROM t1,t2,t3 -WHERE t3.u <='a' AND t2.j < 5 AND t3.v = t2.u; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 16 -1 SIMPLE t2 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join) -1 SIMPLE t3 hash_ALL idx #hash#idx 3 test.t2.u 40 Using where; Using join buffer (flat, BNLH join) -SELECT t1.i, t1.d, t1.v, t2.i, t2.d, t2.t, t2.v FROM t1,t2,t3 -WHERE t3.u <='a' AND t2.j < 5 AND t3.v = t2.u; -i d v i d t v -0 2008-06-04 p 1 2002-07-13 06:34:26 v -0 2008-06-04 p 4 2006-10-14 14:59:37 v -0 2008-06-04 p 5 1900-01-01 22:45:53 a -0 2008-06-04 p 5 1900-01-01 22:45:53 a -0 2008-06-04 p 5 1900-01-01 22:45:53 a -1 1900-01-01 a 1 2002-07-13 06:34:26 v -1 1900-01-01 a 4 2006-10-14 14:59:37 v -1 1900-01-01 a 5 1900-01-01 22:45:53 a -1 1900-01-01 a 5 1900-01-01 22:45:53 a -1 1900-01-01 a 5 1900-01-01 22:45:53 a -1 2002-07-13 v 1 2002-07-13 06:34:26 v -1 2002-07-13 v 4 2006-10-14 14:59:37 v -1 2002-07-13 v 5 1900-01-01 22:45:53 a -1 2002-07-13 v 5 1900-01-01 22:45:53 a -1 2002-07-13 v 5 1900-01-01 22:45:53 a -1 2006-04-02 z 1 2002-07-13 06:34:26 v -1 2006-04-02 z 4 2006-10-14 14:59:37 v -1 2006-04-02 z 5 1900-01-01 22:45:53 a -1 2006-04-02 z 5 1900-01-01 22:45:53 a -1 2006-04-02 z 5 1900-01-01 22:45:53 a -2 1900-01-01 v 1 2002-07-13 06:34:26 v -2 1900-01-01 v 4 2006-10-14 14:59:37 v -2 1900-01-01 v 5 1900-01-01 22:45:53 a -2 1900-01-01 v 5 1900-01-01 22:45:53 a -2 1900-01-01 v 5 1900-01-01 22:45:53 a -2 2009-10-02 s 1 2002-07-13 06:34:26 v -2 2009-10-02 s 4 2006-10-14 14:59:37 v -2 2009-10-02 s 5 1900-01-01 22:45:53 a -2 2009-10-02 s 5 1900-01-01 22:45:53 a -2 2009-10-02 s 5 1900-01-01 22:45:53 a -3 1900-01-01 v 1 2002-07-13 06:34:26 v -3 1900-01-01 v 4 2006-10-14 14:59:37 v -3 1900-01-01 v 5 1900-01-01 22:45:53 a -3 1900-01-01 v 5 1900-01-01 22:45:53 a -3 1900-01-01 v 5 1900-01-01 22:45:53 a -3 2006-10-19 n 1 2002-07-13 06:34:26 v -3 2006-10-19 n 4 2006-10-14 14:59:37 v -3 2006-10-19 n 5 1900-01-01 22:45:53 a -3 2006-10-19 n 5 1900-01-01 22:45:53 a -3 2006-10-19 n 5 1900-01-01 22:45:53 a -3 2008-12-04 v 1 2002-07-13 06:34:26 v -3 2008-12-04 v 4 2006-10-14 14:59:37 v -3 2008-12-04 v 5 1900-01-01 22:45:53 a -3 2008-12-04 v 5 1900-01-01 22:45:53 a -3 2008-12-04 v 5 1900-01-01 22:45:53 a -3 2009-03-28 f 1 2002-07-13 06:34:26 v -3 2009-03-28 f 4 2006-10-14 14:59:37 v -3 2009-03-28 f 5 1900-01-01 22:45:53 a -3 2009-03-28 f 5 1900-01-01 22:45:53 a -3 2009-03-28 f 5 1900-01-01 22:45:53 a -4 2006-10-14 v 1 2002-07-13 06:34:26 v -4 2006-10-14 v 4 2006-10-14 14:59:37 v -4 2006-10-14 v 5 1900-01-01 22:45:53 a -4 2006-10-14 v 5 1900-01-01 22:45:53 a -4 2006-10-14 v 5 1900-01-01 22:45:53 a -5 1900-01-01 a 1 2002-07-13 06:34:26 v -5 1900-01-01 a 4 2006-10-14 14:59:37 v -5 1900-01-01 a 5 1900-01-01 22:45:53 a -5 1900-01-01 a 5 1900-01-01 22:45:53 a -5 1900-01-01 a 5 1900-01-01 22:45:53 a -5 2004-09-18 h 1 2002-07-13 06:34:26 v -5 2004-09-18 h 4 2006-10-14 14:59:37 v -5 2004-09-18 h 5 1900-01-01 22:45:53 a -5 2004-09-18 h 5 1900-01-01 22:45:53 a -5 2004-09-18 h 5 1900-01-01 22:45:53 a -5 2008-04-04 y 1 2002-07-13 06:34:26 v -5 2008-04-04 y 4 2006-10-14 14:59:37 v -5 2008-04-04 y 5 1900-01-01 22:45:53 a -5 2008-04-04 y 5 1900-01-01 22:45:53 a -5 2008-04-04 y 5 1900-01-01 22:45:53 a -8 2005-06-08 d 1 2002-07-13 06:34:26 v -8 2005-06-08 d 4 2006-10-14 14:59:37 v -8 2005-06-08 d 5 1900-01-01 22:45:53 a -8 2005-06-08 d 5 1900-01-01 22:45:53 a -8 2005-06-08 d 5 1900-01-01 22:45:53 a -8 2009-01-13 z 1 2002-07-13 06:34:26 v -8 2009-01-13 z 4 2006-10-14 14:59:37 v -8 2009-01-13 z 5 1900-01-01 22:45:53 a -8 2009-01-13 z 5 1900-01-01 22:45:53 a -8 2009-01-13 z 5 1900-01-01 22:45:53 a -DROP TABLE t1,t2,t3; -SET SESSION join_cache_level=DEFAULT; -SET SESSION join_buffer_size=DEFAULT; -# -# Bug #664508: 'Simple' GROUP BY + ORDER BY -# when join buffers are used -# -CREATE TABLE t1 ( -pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL, -PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2 (v,i) -) COLLATE latin1_bin; -INSERT INTO t1 VALUES -(10,8,'v'), (11,8,'f'), (13,8,'s'), (14,8,'a'), -(15,6,'p'), (16,7,'z'), (17,2,'a'), (18,5,'h'), (19,7,'h'), -(25,3,'m'), (26,5,'a'), (27,9,'n'), (28,1,'d'), (29,107,'a'); -INSERT INTO t1 VALUES -(110,8,'x'), (111,8,'y'), (112,5,'v'), (113,8,'z'), (114,8,'i'), -(115,6,'j'), (116,7,'t'), (117,2,'b'), (118,5,'j'), (119,7,'w'), -(125,3,'q'), (126,5,'o'), (127,9,'n'), (128,1,'e'), (129,107,'c'); -INSERT INTO t1 VALUES -(210,8,'b'), (211,8,'c'), (212,5,'d'), (213,8,'e'), (214,8,'g'), -(215,6,'f'), (216,7,'h'), (217,2,'i'), (218,5,'j'), (219,7,'k'), -(225,3,'l'), (226,5,'m'), (227,9,'n'), (228,1,'o'), (229,107,'p'); -CREATE TABLE t2 ( -pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL, -PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2(v,i) -) COLLATE latin1_bin; -INSERT INTO t2 VALUES -(10,8,'v'), (11,8,'f'), (12,5,'v'), (13,8,'s'), (14,8,'a'), -(15,6,'p'), (16,7,'z'), (17,2,'a'), (18,5,'h'), (19,7,'h'), -(20,2,'v'), (21,9,'v'), (22,142,'b'), (23,3,'y'), (24,0,'v'), -(25,3,'m'), (26,5,'b'), (27,9,'n'), (28,1,'d'), (29,107,'a'); -CREATE TABLE t3 ( -pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL, -PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2(v,i) -) COLLATE latin1_bin; -INSERT INTO t3 VALUES -(1,9,'x'), (2,5,'g'), (3,1,'o'), (4,0,'g'), (5,1,'v'), -(6,190,'m'), (7,6,'x'), (8,3,'c'), (9,4,'z'), (10,3,'i'), -(11,186,'x'), (12,1,'g'), (13,8,'q'), (14,226,'m'), (15,133,'p'), -(16,6,'e'), (17,3,'t'), (18,8,'j'), (19,5,'h'), (20,7,'w'); -SET SESSION join_cache_level=1; -EXPLAIN -SELECT t2.v FROM t1, t2, t3 -WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort -1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where -1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where -SELECT t2.v FROM t1, t2, t3 -WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -v -b -h -n -v -p -EXPLAIN -SELECT t2.v FROM t1, t2, t3 -WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort -1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where -1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where -SELECT t2.v FROM t1, t2, t3 -WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -v -b -h -n -v -p -SET SESSION join_cache_level=6; -EXPLAIN -SELECT t2.v FROM t1, t2, t3 -WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort -1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -SELECT t2.v FROM t1, t2, t3 -WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -v -b -h -n -v -p -EXPLAIN -SELECT t2.v FROM t1, t2, t3 -WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort -1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan -1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -SELECT t2.v FROM t1, t2, t3 -WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -v -b -h -n -v -p -SET SESSION join_cache_level=4; -EXPLAIN -SELECT t2.v FROM t1, t2, t3 -WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort -1 SIMPLE t3 hash_ALL PRIMARY,idx2 #hash#PRIMARY 4 test.t2.i 20 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE t1 hash_ALL idx2 #hash#idx2 3 test.t3.v 44 Using where; Using join buffer (incremental, BNLH join) -SELECT t2.v FROM t1, t2, t3 -WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -v -b -h -n -v -p -EXPLAIN -SELECT t2.v FROM t1, t2, t3 -WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort -1 SIMPLE t3 hash_ALL PRIMARY,idx2 #hash#PRIMARY 4 test.t2.i 20 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE t1 hash_ALL idx2 #hash#idx2 3 test.t3.v 44 Using where; Using join buffer (incremental, BNLH join) -SELECT t2.v FROM t1, t2, t3 -WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100 -GROUP BY t2.v ORDER BY t1.pk,t2.v; -v -b -h -n -v -p -DROP TABLE t1,t2,t3; -SET SESSION join_cache_level=DEFAULT; -# -# Bug #668290: hash join with non-binary collations -# -CREATE TABLE t1 ( -i int DEFAULT NULL, -cl varchar(10) CHARACTER SET latin1 DEFAULT NULL, -cu varchar(10) CHARACTER SET utf8 DEFAULT NULL, -INDEX cl (cl), -INDEX cu (cu) -); -INSERT INTO t1 VALUES -(650903552,'cmxffkpsel','z'), (535298048,'tvtjrcmxff','y'), -(1626865664,'when','for'), (39649280,'rcvljitvtj','ercvljitvt'), -(792068096,'ttercvljit','jttercvlji'); -INSERT INTO t1 SELECT * FROM t1; -CREATE TABLE t2 ( -cu varchar(10) CHARACTER SET utf8 DEFAULT NULL, -i int DEFAULT NULL, -cl varchar(10) CHARACTER SET latin1 DEFAULT NULL, -INDEX cu (cu), -INDEX cl (cl) -); -INSERT INTO t2 VALUES -('g',7,'like'), ('fujttercvl',6,'y'), -('s',2,'e'), ('didn\'t',0,'v'), - ('gvdrodpedk',8,'chogvdrodp'), ('jichogvdro',7,'will'); -EXPLAIN -SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 -1 SIMPLE t1 ref cu cu 33 func 2 Using where; Using index -SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ; -i -6 -6 -SET SESSION join_cache_level = 4; -EXPLAIN -SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 6 -1 SIMPLE t1 hash_index cu #hash#cu:cu 33:33 func 10 Using where; Using index; Using join buffer (flat, BNLH join) -SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ; -i -6 -6 -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2; -# -# Bug #669382: hash join using a ref with constant key parts -# -CREATE TABLE t1 (a int); -INSERT INTO t1 VALUES -(9), (11), (7), (8), (4), (1), (12), (3), (5); -INSERT INTO t1 SELECT * FROM t1; -INSERT INTO t1 SELECT * FROM t1; -CREATE TABLE t2 (a int, b int, c int, INDEX idx (a,b)); -INSERT INTO t2 VALUES -(8, 80, 800), (1, 10, 100), (1, 11, 101), (3, 30, 300), -(1, 12, 102), (8, 81, 801), (7, 70, 700), (12, 120, 1200), -(8, 82, 802), (1, 13, 103), (1, 14, 104), (3, 31, 301), -(1, 15, 105), (8, 83, 803), (7, 71, 701); -SET SESSION join_cache_level = 4; -SET SESSION join_buffer_size = 256; -EXPLAIN -SELECT t1.a, t2.c FROM t1,t2 WHERE t1.a=t2.a AND t2.b=99; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL idx NULL NULL NULL 15 Using where -1 SIMPLE t1 hash_ALL NULL #hash#$hj 5 test.t2.a 36 Using where; Using join buffer (flat, BNLH join) -SELECT t1.a, t2.c FROM t1,t2 WHERE t1.a=t2.a AND t2.b=99; -a c -SET SESSION join_cache_level = DEFAULT; -SET SESSION join_buffer_size = DEFAULT; -DROP TABLE t1,t2; -# -# Bug #671901: hash join using a ref to a varchar field -# -CREATE TABLE t1 ( -v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL, -i int DEFAULT NULL -); -INSERT INTO t1 VALUES -('k',8), ('abcdefjh',-575340544), ('f',77), ('because', 2), ('f',-517472256), -('abcdefjhj',5), ('z',7); -CREATE TABLE t2 ( -v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL, -i int DEFAULT NULL, -INDEX idx (v) -); -INSERT INTO t2 VALUES -('did',5), ('was',-1631322112), ('are',3), ('abcdefjhjk',3), -('abcdefjhjk',4), ('tell',-824573952), ('t',0),('v',-1711013888), -('abcdefjhjk',1015414784), ('or',4), ('now',0), ('abcdefjhjk',-32702464), -('abcdefjhjk',4), ('time',1078394880), ('f',4), ('m',-1845559296), -('ff', 5), ('abcdefjhjk',-1074397184); -INSERT INTO t2 VALUES -('dig',5), ('were',-1631322112), ('is',3), ('abcdefjhjl',3), -('abcdefjh',4), ('told',-824573952), ('tt',0),('vv',-1711013888), -('abcdefjhjj',1015414784), ('and',4), ('here',0), ('abcdefjhjm',-32702464), -('abcdefjhji',4), ('space',1078394880), ('fs',4), ('mn',-1845559296), -('fq', 5), ('abcdefjhjp',-1074397184); -EXPLAIN -SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where -1 SIMPLE t2 ref idx idx 13 test.t1.v 3 -SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v; -v i -abcdefjh 4 -f 4 -f 4 -EXPLAIN -SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v); -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 7 -1 SIMPLE t2 ref idx idx 13 func 3 Using index condition -SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v); -v i -f 5 -f 5 -SET SESSION join_cache_level = 4; -EXPLAIN -SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where -1 SIMPLE t2 hash_ALL idx #hash#idx 13 test.t1.v 36 Using join buffer (flat, BNLH join) -SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v; -v i -f 4 -f 4 -abcdefjh 4 -EXPLAIN -SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v); -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 7 -1 SIMPLE t2 hash_ALL idx #hash#idx 13 func 36 Using where; Using join buffer (flat, BNLH join) -SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v); -v i -f 5 -f 5 -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2; -# Bug #672497: 3 way join with tiny incremental join buffer with -# and a ref access from the first table -# -CREATE TABLE t1 ( -pk int PRIMARY KEY, -v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL, -INDEX idx (v) -); -INSERT INTO t1 VALUES -(1,'abcdefjhjk'), (2,'i'),(3,'abcdefjhjk'), (4,'well'), (5,'abcdefjhjk'), -(6,'abcdefjhjk'), (7,'that'); -CREATE TABLE t2 ( -pk int PRIMARY KEY, -i int DEFAULT NULL, -v varchar(1000) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL, -INDEX idx (v) -); -INSERT INTO t2 VALUES -(1,6,'yes'), (2,NULL,'will'), (3,NULL,'o'), (4,NULL,'k'), (5,NULL,'she'), -(6,-1450835968,'abcdefjhjkl'), (7,-975831040,'abcdefjhjkl'), (8,NULL,'z'), -(10,-343932928,'t'), -(11,6,'yes'), (12,NULL,'will'), (13,NULL,'o'), (14,NULL,'k'), (15,NULL,'she'), -(16,-1450835968,'abcdefjhjkl'), (17,-975831040,'abcdefjhjkl'), (18,NULL,'z'), -(19,-343932928,'t'); -INSERT INTO t2 VALUES -(101,6,'yes'), (102,NULL,'will'), (103,NULL,'o'), (104,NULL,'k'), (105,NULL,'she'), -(106,-1450835968,'abcdefjhjkl'), (107,-975831040,'abcdefjhjkl'), (108,NULL,'z'), -(100,-343932928,'t'), -(111,6,'yes'), (112,NULL,'will'), (113,NULL,'o'), (114,NULL,'k'), (115,NULL,'she'), -(116,-1450835968,'abcdefjhjkl'), (117,-975831040,'abcdefjhjkl'), (118,NULL,'z'), -(119,-343932928,'t'); -CREATE TABLE t3 ( -pk int NOT NULL PRIMARY KEY, -i int, -v varchar(1024) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL, -INDEX idx (v(333)) -); -INSERT INTO t3 VALUES -(1,7,'abcdefjhjkl'),(2,6,'y'), (3,NULL,'to'),(4,7,'n'),(5,7,'look'), (6,NULL,'all'), -(7,1443168256,'c'), (8,1427046400,'right'), -(11,7,'abcdefjhjkl'), (12,6,'y'), (13,NULL,'to'), (14,7,'n'), (15,7,'look'), -(16,NULL,'all'), (17,1443168256,'c'), (18,1427046400,'right'), -(21,7,'abcdefjhjkl'), (22,6,'y'), (23,NULL,'to'), (24,7,'n'), (25,7,'look'), -(26,NULL,'all'), (27,1443168256,'c'), (28,1427046400,'right'), -(31,7,'abcdefjhjkl'), (32,6,'y'), (33,NULL,'to'), (34,7,'n'), (35,7,'look'), -(36,NULL,'all'), (37,1443168256,'c'), (38,1427046400,'right'); -INSERT INTO t3 VALUES -(101,7,'abcdefjhjkl'),(102,6,'y'), (103,NULL,'to'),(104,7,'n'),(105,7,'look'), -(106,NULL,'all'), (107,1443168256,'c'), (108,1427046400,'right'), -(111,7,'abcdefjhjkl'), (112,6,'y'), (113,NULL,'to'), (114,7,'n'), (115,7,'look'), -(116,NULL,'all'), (117,1443168256,'c'), (118,1427046400,'right'), -(121,7,'abcdefjhjkl'), (122,6,'y'), (123,NULL,'to'), (124,7,'n'), (125,7,'look'), -(126,NULL,'all'), (127,1443168256,'c'), (128,1427046400,'right'), -(131,7,'abcdefjhjkl'), (132,6,'y'), (133,NULL,'to'), (134,7,'n'), (135,7,'look'), -(136,NULL,'all'), (137,1443168256,'c'), (138,1427046400,'right'); -SET SESSION join_buffer_size = 256; -SET SESSION join_cache_level = 4; -EXPLAIN -SELECT t3.i FROM t1,t2,t3 -WHERE t1.v = t2.v AND t3.v = t1.v AND t2.i <> 0; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 index idx idx 13 NULL 7 Using where; Using index -1 SIMPLE t2 hash_ALL idx #hash#idx 1003 test.t1.v 36 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE t3 hash_ALL idx #hash#idx 1002 func 64 Using where; Using join buffer (incremental, BNLH join) -SELECT t3.i FROM t1,t2,t3 -WHERE t1.v = t2.v AND t3.v = t1.v AND t2.i <> 0; -i -SET SESSION join_cache_level = DEFAULT; -SET SESSION join_buffer_size = DEFAULT; -DROP TABLE t1,t2,t3; -# -# Bug #672551: hash join over a long varchar field -# -CREATE TABLE t1 ( -pk int PRIMARY KEY, -a varchar(512) CHARSET latin1 COLLATE latin1_bin DEFAULT NULL, -INDEX idx (a) -); -INSERT INTO t1 VALUES (2, 'aa'), (5, 'ccccccc'), (3, 'bb'); -CREATE TABLE t2( -pk int PRIMARY KEY, -a varchar(512) CHARSET latin1 COLLATE latin1_bin DEFAULT NULL, -INDEX idx (a) -); -INSERT INTO t2 VALUES -(10, 'a'), (20, 'c'), (30, 'aa'), (4, 'bb'), -(11, 'a'), (21, 'c'), (31, 'aa'), (41, 'cc'), -(12, 'a'), (22, 'c'), (32, 'bb'), (42, 'aa'); -INSERT INTO t2 VALUES -(110, 'a'), (120, 'c'), (130, 'aa'), (14, 'bb'), -(111, 'a'), (121, 'c'), (131, 'aa'), (141, 'cc'), -(112, 'a'), (122, 'c'), (132, 'bb'), (142, 'aa'); -SELECT * FROM t1,t2 WHERE t2.a=t1.a; -pk a pk a -2 aa 30 aa -2 aa 31 aa -2 aa 42 aa -2 aa 130 aa -2 aa 131 aa -2 aa 142 aa -3 bb 4 bb -3 bb 32 bb -3 bb 14 bb -3 bb 132 bb -SET SESSION join_cache_level = 4; -EXPLAIN -SELECT * FROM t1,t2 WHERE t2.a=t1.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL idx NULL NULL NULL 3 Using where -1 SIMPLE t2 hash_ALL idx #hash#idx 515 test.t1.a 24 Using join buffer (flat, BNLH join) -SELECT * FROM t1,t2 WHERE t2.a=t1.a; -pk a pk a -2 aa 30 aa -3 bb 4 bb -2 aa 31 aa -3 bb 32 bb -2 aa 42 aa -2 aa 130 aa -3 bb 14 bb -2 aa 131 aa -3 bb 132 bb -2 aa 142 aa -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2; -# -# Bug #674431: nested outer join when join_cache_level is set to 7 -# -CREATE TABLE t1 (a int, b varchar(32)) ; -INSERT INTO t1 VALUES (5,'h'), (NULL,'j'); -CREATE TABLE t2 (a int, b varchar(32), c int) ; -INSERT INTO t2 VALUES (5,'h',100), (NULL,'j',200); -CREATE TABLE t3 (a int, b varchar(32), INDEX idx(b)); -INSERT INTO t3 VALUES (77,'h'), (88,'g'); -SET SESSION optimizer_switch = 'outer_join_with_cache=on'; -SET SESSION join_cache_level = 7; -SELECT t3.a -FROM t1 LEFT JOIN -(t2 LEFT OUTER JOIN t3 ON t2.b = t3.b) ON t2.a = t1.b -WHERE t3.a BETWEEN 3 AND 11 OR t1.a <= t2.c; -a -Warnings: -Warning 1292 Truncated incorrect INTEGER value: 'h' -Warning 1292 Truncated incorrect INTEGER value: 'j' -SET SESSION optimizer_switch = 'outer_join_with_cache=off'; -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2,t3; -# -# Bug #52540: nested outer join when join_cache_level is set to 3 -# -CREATE TABLE t1 (a int); -INSERT INTO t1 VALUES (2); -CREATE TABLE t2 (a varchar(10)); -INSERT INTO t2 VALUES ('f'),('x'); -CREATE TABLE t3 (pk int(11) PRIMARY KEY); -INSERT INTO t3 VALUES (2); -CREATE TABLE t4 (a varchar(10)); -SET SESSION optimizer_switch = 'outer_join_with_cache=on'; -SET SESSION join_cache_level = 3; -SELECT * -FROM t2 LEFT JOIN -((t1 JOIN t3 ON t1.a = t3.pk) LEFT JOIN t4 ON 1) ON 1; -a a pk a -f 2 2 NULL -x 2 2 NULL -SET SESSION optimizer_switch = 'outer_join_with_cache=off'; -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2,t3,t4; -# -# Bug #674423: outer join with ON expression over only outer tables -# -CREATE TABLE t1 (a int) ; -INSERT INTO t1 VALUES ('9'); -CREATE TABLE t2 (pk int, a int) ; -INSERT INTO t2 VALUES ('9',NULL), ('1',NULL); -SET SESSION optimizer_switch = 'outer_join_with_cache=on'; -SET SESSION join_cache_level = 0; -EXPLAIN -SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 -1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where -SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <>0 OR t2.pk < 9; -pk a a -1 NULL NULL -SET SESSION join_cache_level = 1; -EXPLAIN -SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 -1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join) -SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9; -pk a a -1 NULL NULL -SET SESSION optimizer_switch = 'outer_join_with_cache=off'; -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2; -# -# Bug #675095: nested outer join using join buffer -# -CREATE TABLE t1 (pk int, a1 int) ; -INSERT IGNORE INTO t1 VALUES (2,NULL), (8,0); -CREATE TABLE t2 (pk int, a2 int, c2 int, d2 int) ; -INSERT IGNORE INTO t2 VALUES (9,0,0,2), (1,0,0,7); -CREATE TABLE t3 (pk int, a3 int, c3 int, d3 int) ; -INSERT IGNORE INTO t3 VALUES (9,0,0,2), (1,0,0,7); -CREATE TABLE t4 (pk int, a4 int, INDEX idx(a4)) ; -INSERT IGNORE INTO t4 VALUES (2,NULL), (8,0); -INSERT IGNORE INTO t4 VALUES (12,10), (18,20); -INSERT IGNORE INTO t4 VALUES (22,11), (28,21); -INSERT IGNORE INTO t4 VALUES (32,12), (38,22); -CREATE TABLE t5 (pk int, a5 int) ; -INSERT IGNORE INTO t5 VALUES (2,0), (8,0); -SET SESSION optimizer_switch = 'outer_join_with_cache=on'; -SET SESSION join_cache_level = 0; -EXPLAIN EXTENDED -SELECT * -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2) -LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5; -id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where -1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where -1 SIMPLE t4 ref idx idx 5 test.t1.a1 2 100.00 Using where -1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where -Warnings: -Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1 -SELECT * -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2) -LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5; -pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5 -2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0 -2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0 -2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0 -2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0 -8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL -SET SESSION join_cache_level = 2; -EXPLAIN EXTENDED -SELECT * -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2) -LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5; -id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join) -1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE t4 ref idx idx 5 test.t1.a1 2 100.00 Using where -1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join) -Warnings: -Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1 -SELECT * -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2) -LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5; -pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5 -2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0 -2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0 -2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0 -2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0 -8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL -SET SESSION join_cache_level = 1; -EXPLAIN EXTENDED -SELECT * -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2) -LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5; -id select_type table type possible_keys key key_len ref rows filtered Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 -1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where -1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where -1 SIMPLE t4 ref idx idx 5 test.t1.a1 2 100.00 Using where -1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join) -Warnings: -Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1 -SELECT * -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2) -LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5; -pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5 -2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0 -2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0 -2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0 -2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0 -8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL -SET SESSION optimizer_switch = 'outer_join_with_cache=off'; -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2,t3,t4,t5; -# -# Bug #675516: nested outer join with 3 tables in the nest -# using BNL + BNLH -# -CREATE TABLE t1 (a1 int, b1 int, c1 int) ; -INSERT INTO t1 VALUES (7,8,0), (6,4,0); -CREATE TABLE t2 (a2 int) ; -INSERT INTO t2 VALUES (5); -CREATE TABLE t3 (a3 int, b3 int, c3 int, PRIMARY KEY (b3)) ; -INSERT INTO t3 VALUES (2,5,0); -CREATE TABLE t4 (a4 int, b4 int, c4 int) ; -INSERT INTO t4 VALUES (7,8,0); -SET SESSION optimizer_switch = 'outer_join_with_cache=on'; -SET SESSION join_cache_level = 4; -EXPLAIN -SELECT * FROM -t1 LEFT JOIN -((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3 -WHERE t3.a3 IS NULL; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t3 hash_ALL PRIMARY #hash#$hj 5 test.t1.c1 1 Using where; Using join buffer (flat, BNLH join) -1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t3.b3 1 Using where; Using join buffer (incremental, BNLH join) -1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -SELECT * FROM -t1 LEFT JOIN -((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3 -WHERE t3.a3 IS NULL; -a1 b1 c1 a2 a3 b3 c3 a4 b4 c4 -SET SESSION join_cache_level = 0; -EXPLAIN -SELECT * FROM -t1 LEFT JOIN -((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3 -WHERE t3.a3 IS NULL; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where -1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where -SELECT * FROM -t1 LEFT JOIN -((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3 -WHERE t3.a3 IS NULL; -a1 b1 c1 a2 a3 b3 c3 a4 b4 c4 -SET SESSION optimizer_switch = 'outer_join_with_cache=off'; -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2,t3,t4; -# -# Bug #660963: nested outer join with join_cache_level set to 5 -# -CREATE TABLE t1 (a1 int) ; -INSERT INTO t1 VALUES (0),(0); -CREATE TABLE t2 (a2 int, b2 int, PRIMARY KEY (a2)) ; -INSERT INTO t2 VALUES (2,1); -CREATE TABLE t3 (a3 int, b3 int, PRIMARY KEY (a3)) ; -INSERT INTO t3 VALUES (2,1); -SET SESSION optimizer_switch = 'outer_join_with_cache=on'; -SET SESSION join_cache_level = 6; -EXPLAIN -SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join) -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0; -a1 a2 b2 a3 b3 -0 2 1 2 1 -0 2 1 2 1 -SET SESSION join_cache_level = 5; -EXPLAIN -SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join) -1 SIMPLE t3 hash_ALL PRIMARY #hash#PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BNLH join) -SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0; -a1 a2 b2 a3 b3 -0 2 1 2 1 -0 2 1 2 1 -SET SESSION optimizer_switch = 'outer_join_with_cache=off'; -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2,t3; -# -# Bug #675922: incremental buffer for BKA with access from previous -# buffers from non-nullable columns whose values may be null -# -CREATE TABLE t1 (a1 varchar(32)) ; -INSERT INTO t1 VALUES ('s'),('k'); -CREATE TABLE t2 (a2 int PRIMARY KEY, b2 varchar(32)) ; -INSERT INTO t2 VALUES (7,'s'); -CREATE TABLE t3 (a3 int PRIMARY KEY, b3 varchar(32)) ; -INSERT INTO t3 VALUES (7,'s'); -CREATE TABLE t4 (a4 int) ; -INSERT INTO t4 VALUES (9); -CREATE TABLE t5(a5 int PRIMARY KEY, b5 int) ; -INSERT INTO t5 VALUES (7,0); -SET SESSION optimizer_switch = 'outer_join_with_cache=on'; -SET SESSION join_cache_level = 0; -EXPLAIN -SELECT t4.a4, t5.b5 -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1) -LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index -1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where -SELECT t4.a4, t5.b5 -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1) -LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2; -a4 b5 -9 0 -9 NULL -SET SESSION join_cache_level = 6; -EXPLAIN -SELECT t4.a4, t5.b5 -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1) -LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where -1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index -1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join) -1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan -SELECT t4.a4, t5.b5 -FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1) -LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2; -a4 b5 -9 0 -9 NULL -SET SESSION optimizer_switch = 'outer_join_with_cache=off'; -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2,t3,t4,t5; -# -# Bug #670380: hash join for non-binary collation -# -CREATE TABLE t1 (pk int PRIMARY KEY, a varchar(32)); -CREATE TABLE t2 (pk int PRIMARY KEY, a varchar(32), INDEX idx(a)); -INSERT INTO t1 VALUES -(10,'AAA'), (20,'BBBB'), (30,'Cc'), (40,'DD'), (50,'ee'); -INSERT INTO t2 VALUES -(1,'Bbbb'), (2,'BBB'), (3,'bbbb'), (4,'AaA'), (5,'CC'), -(6,'cC'), (7,'CCC'), (8,'AAA'), (9,'bBbB'), (10,'aaaa'), -(11,'a'), (12,'dd'), (13,'EE'), (14,'ee'), (15,'D'), -(101,'Bbbb'), (102,'BBB'), (103,'bbbb'), (104,'AaA'), (105,'CC'), -(106,'cC'), (107,'CCC'), (108,'AAA'), (109,'bBbB'), (110,'aaaa'), -(111,'a'), (112,'dd'), (113,'EE'), (114,'ee'), (115,'D'); -SET SESSION join_cache_level = 4; -EXPLAIN -SELECT * FROM t1,t2 WHERE t1.a=t2.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where -1 SIMPLE t2 hash_ALL idx #hash#idx 35 test.t1.a 30 Using join buffer (flat, BNLH join) -SELECT * FROM t1,t2 WHERE t1.a=t2.a; -pk a pk a -20 BBBB 1 Bbbb -20 BBBB 3 bbbb -10 AAA 4 AaA -30 Cc 5 CC -30 Cc 6 cC -10 AAA 8 AAA -20 BBBB 9 bBbB -40 DD 12 dd -50 ee 13 EE -50 ee 14 ee -20 BBBB 101 Bbbb -20 BBBB 103 bbbb -10 AAA 104 AaA -30 Cc 105 CC -30 Cc 106 cC -10 AAA 108 AAA -20 BBBB 109 bBbB -40 DD 112 dd -50 ee 113 EE -50 ee 114 ee -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2; -# -# Bug #694092: incorrect detection of index only pushdown conditions -# -CREATE TABLE t1 ( -f1 varchar(10), f3 int(11), PRIMARY KEY (f3) -); -INSERT INTO t1 VALUES ('y',1),('or',5); -CREATE TABLE t2 ( -f3 int(11), f2 varchar(1024), f4 varchar(10), PRIMARY KEY (f3) -); -INSERT INTO t2 VALUES (6,'RPOYT','y'),(10,'JINQE','m'); -SET SESSION join_cache_level = 1; -SET SESSION optimizer_switch = 'index_condition_pushdown=off'; -EXPLAIN -SELECT * FROM t1,t2 -WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6); -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where; Rowid-ordered scan -1 SIMPLE t2 range PRIMARY PRIMARY 4 NULL 2 Using where; Rowid-ordered scan; Using join buffer (flat, BNL join) -SELECT * FROM t1,t2 -WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6); -f1 f3 f3 f2 f4 -SET SESSION optimizer_switch = 'index_condition_pushdown=on'; -EXPLAIN -SELECT * FROM t1,t2 -WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6); -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Using where; Rowid-ordered scan -1 SIMPLE t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Using where; Rowid-ordered scan; Using join buffer (flat, BNL join) -SELECT * FROM t1,t2 -WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6); -f1 f3 f3 f2 f4 -SET SESSION join_cache_level = DEFAULT; -SET SESSION optimizer_switch = @local_join_cache_test_optimizer_switch_default; -DROP TABLE t1,t2; -CREATE TABLE t1 (f1 int, f2 varchar(10), KEY (f1), KEY (f2)) ; -INSERT INTO t1 VALUES -(4,'e'), (891879424,'l'), (-243400704,'ectlyqupbk'), (1851981824,'of'), -(-1495203840,'you'), (4,'no'), (-1436942336,'c'), (891420672,'DQQYO'), -(608698368,'qergldqmec'), (1,'x'); -CREATE TABLE t2 (f3 varchar(64), KEY (f3)); -INSERT INTO t2 VALUES -('d'), ('UALLN'), ('d'), ('z'), ('r'), ('YVAKV'), ('d'), ('TNGZK'), ('e'), -('xucupaxdyythsgiw'), ('why'), ('ttugkxucupaxdyyt'), ('l'), ('LHTKN'), -('d'), ('o'), ('v'), ('KGLCJ'), ('your'); -SET SESSION optimizer_switch='index_merge_sort_intersection=off'; -SET SESSION optimizer_switch = 'index_condition_pushdown=off'; -EXPLAIN SELECT * FROM t1,t2 -WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0, 100) ORDER BY t1.f2 LIMIT 1; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range f1,f2 f2 13 NULL 10 Using where -1 SIMPLE t2 ref f3 f3 67 test.t1.f2 2 Using where; Using index -SELECT * FROM t1,t2 -WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1; -f1 f2 f3 -SET SESSION optimizer_switch = @local_join_cache_test_optimizer_switch_default; -SET SESSION optimizer_switch = 'index_condition_pushdown=on'; -EXPLAIN SELECT * FROM t1,t2 -WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range f1,f2 f2 13 NULL 10 Using where -1 SIMPLE t2 ref f3 f3 67 test.t1.f2 2 Using where; Using index -SELECT * FROM t1,t2 -WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1; -f1 f2 f3 -SET SESSION optimizer_switch = @local_join_cache_test_optimizer_switch_default; -DROP TABLE t1,t2; -# -# Bug #694443: hash join using IS NULL the an equi-join condition -# -CREATE TABLE t1 (a int PRIMARY KEY); -INSERT INTO t1 VALUES -(7), (4), (9), (1), (3), (8), (2); -CREATE TABLE t2 (a int, b int, INDEX idx (a)); -INSERT INTO t2 VALUES -(NULL,10), (4,80), (7,70), (6,11), (7,90), (NULL,40), -(4,77), (4,50), (NULL,41), (7,99), (7,88), (8,12), -(1,21), (4,90), (7,91), (8,22), (6,92), (NULL,42), -(2,78), (2,51), (1,43), (5,97), (5,89); -SET SESSION join_cache_level = 1; -EXPLAIN -SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 3 Using where; Using index -1 SIMPLE t2 ref idx idx 5 const 4 Using index condition -SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL; -a a b -1 NULL 10 -1 NULL 40 -1 NULL 41 -1 NULL 42 -2 NULL 10 -2 NULL 40 -2 NULL 41 -2 NULL 42 -SET SESSION join_cache_level = 4; -EXPLAIN -SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 3 Using where; Using index -1 SIMPLE t2 hash_range idx #hash#idx:idx 5:5 const 4 Using index condition; Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join) -SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL; -a a b -1 NULL 10 -2 NULL 10 -1 NULL 40 -2 NULL 40 -1 NULL 41 -2 NULL 41 -1 NULL 42 -2 NULL 42 -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2; -# -# Bug #697557: hash join on a varchar field -# -CREATE TABLE t1 ( f1 varchar(10) , f2 int(11) , KEY (f1)); -INSERT INTO t1 VALUES ('r',1), ('m',2); -CREATE TABLE t2 ( f1 varchar(10) , f2 int(11) , KEY (f1)); -INSERT INTO t2 VALUES -('hgtofubn',1), ('GDOXZ',91), ('n',2), ('fggxgalh',88), -('hgtofu',1), ('GDO',101), ('n',3), ('fggxga',55), -('hgtofu',3), ('GDO',33), ('nn',3), ('fggxgarrr',77), -('jgtofu',3), ('JDO',33), ('mn',3), ('jggxgarrr',77), -('igtofu',3), ('IDO',33), ('ln',3), ('iggxgarrr',77); -SET SESSION join_cache_level=3; -EXPLAIN -SELECT * FROM t1,t2 WHERE t2.f1 = t1.f1; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL f1 NULL NULL NULL 2 Using where -1 SIMPLE t2 hash_ALL f1 #hash#f1 13 test.t1.f1 20 Using join buffer (flat, BNLH join) -SELECT * FROM t1,t2 WHERE t2.f1 = t1.f1; -f1 f2 f1 f2 -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1,t2; -# -# Bug #707827: hash join on varchar column with NULLs -# -CREATE TABLE t1 (v varchar(1)); -INSERT INTO t1 VALUES ('o'), ('u'); -CREATE TABLE t2 (a int, v varchar(1), INDEX idx (v)) ; -INSERT INTO t2 VALUES -(8,NULL), (10,'b'), (5,'k'), (4,NULL), -(1,NULL), (11,'u'), (7,NULL), (2,'d'), -(18,'u'), (11,'b'), (15,'k'), (12,'d'), -(18,'x'), (11,'y'), (15,'l'), (12,'e'); -SET SESSION join_buffer_size = 256; -SET SESSION join_cache_level = 4; -EXPLAIN -SELECT a FROM t1,t2 WHERE t2.v = t1.v ; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where -1 SIMPLE t2 hash_ALL idx #hash#idx 4 test.t1.v 16 Using join buffer (flat, BNLH join) -SELECT a FROM t1,t2 WHERE t2.v = t1.v ; -a -11 -18 -SET SESSION join_cache_level = 1; -EXPLAIN -SELECT a FROM t1,t2 WHERE t2.v = t1.v ; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where -1 SIMPLE t2 ref idx idx 4 test.t1.v 2 -SELECT a FROM t1,t2 WHERE t2.v = t1.v ; -a -11 -18 -SET SESSION join_cache_level = DEFAULT; -SET SESSION join_buffer_size = DEFAULT; -DROP TABLE t1,t2; -# -# Bug #802860: crash on join cache + derived + duplicate_weedout -# -SET SESSION optimizer_switch= -'semijoin=on,materialization=off,firstmatch=off,loosescan=off,derived_with_keys=on'; -CREATE TABLE t1 (a int) ; -INSERT IGNORE INTO t1 VALUES (0), (1), (0); -CREATE TABLE t2 (a int) ; -INSERT IGNORE INTO t2 VALUES (0), (3), (0), (2); -SET SESSION join_cache_level = 0; -EXPLAIN -SELECT * FROM (SELECT DISTINCT * FROM t1) t -WHERE t.a IN (SELECT t2.a FROM t2); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where; Start temporary -1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 2 End temporary -2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary -SELECT * FROM (SELECT DISTINCT * FROM t1) t -WHERE t.a IN (SELECT t2.a FROM t2); -a -0 -SET SESSION join_cache_level = 1; -EXPLAIN -SELECT * FROM (SELECT DISTINCT * FROM t1) t -WHERE t.a IN (SELECT t2.a FROM t2); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 -1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where; Start temporary; End temporary; Using join buffer (flat, BNL join) -2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary -SELECT * FROM (SELECT DISTINCT * FROM t1) t -WHERE t.a IN (SELECT t2.a FROM t2); -a -0 -SET SESSION join_cache_level = DEFAULT; -DROP TABLE t1, t2; -# -# Bug #887479: join_cache_level=3 + semijoin=on -# -CREATE TABLE t1 (a int, b int); -INSERT INTO t1 VALUES (3914,17), (3710,5), (3888,20); -CREATE TABLE t2 (c int, KEY (c)); -INSERT INTO t2 VALUES (27), (17), (33), (20), (3), (7), (18), (2); -SET @tmp887479_optimizer_switch=@@optimizer_switch; -SET SESSION optimizer_switch='semijoin=on'; -SET SESSION optimizer_switch='semijoin_with_cache=on'; -SET SESSION join_cache_level=1; -EXPLAIN -SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where -1 PRIMARY t2 ref c c 5 test.t1.b 2 Using index; Start temporary; End temporary -SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2); -a b -3914 17 -3888 20 -SET SESSION join_cache_level=3; -EXPLAIN -SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where -1 PRIMARY t2 hash_index c #hash#c:c 5:5 test.t1.b 8 Using index; Start temporary; End temporary; Using join buffer (flat, BNLH join) -SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2); -a b -3914 17 -3888 20 -SET SESSION join_cache_level = DEFAULT; -SET optimizer_switch=@tmp887479_optimizer_switch; -DROP TABLE t1,t2; -# -# Bug #899777: join_cache_level=4 + semijoin=on -# -CREATE TABLE t1 (a int, b int, c int, UNIQUE INDEX idx (a)); -INSERT INTO t1 VALUES (1,8,6), (2,2,8); -CREATE TABLE t2 (a int, b int, c int, UNIQUE INDEX idx (a)); -INSERT INTO t2 VALUES (1,8,6), (2,2,8); -CREATE TABLE t3 (a int, b int, c int, UNIQUE INDEX idx (a)); -INSERT INTO t3 VALUES (1,8,6), (2,2,8); -CREATE TABLE t4 (a int, b int, c int, UNIQUE INDEX idx (a)); -INSERT INTO t4 VALUES (1,8,6), (2,2,8); -SET @tmp_optimizer_switch=@@optimizer_switch; -SET SESSION optimizer_switch='semijoin=on'; -SET SESSION optimizer_switch='semijoin_with_cache=on'; -SET SESSION join_cache_level=1; -EXPLAIN -SELECT t1.* FROM t1,t2 -WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b) -AND t1.a = 1; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 const idx idx 5 const 1 -1 PRIMARY t2 ALL NULL NULL NULL NULL 2 -1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where; Start temporary; Using join buffer (flat, BNL join) -1 PRIMARY t4 ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (flat, BNL join) -SELECT t1.* FROM t1,t2 -WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b) -AND t1.a = 1; -a b c -1 8 6 -SET SESSION join_cache_level=4; -EXPLAIN -SELECT t1.* FROM t1,t2 -WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b) -AND t1.a = 1; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 const idx idx 5 const 1 -1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where -1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; Using join buffer (flat, BNLH join) -1 PRIMARY t4 hash_ALL NULL #hash#$hj 10 const,test.t2.b 2 Using where; End temporary; Using join buffer (incremental, BNLH join) -SELECT t1.* FROM t1,t2 -WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b) -AND t1.a = 1; -a b c -1 8 6 -SET SESSION join_cache_level = DEFAULT; -SET optimizer_switch=@tmp_optimizer_switch; -DROP TABLE t1,t2,t3,t4; -# -# Bug #899509: an attempt to use hash join with join_cache_level=0 -# -CREATE TABLE t1 (a int); -INSERT INTO t1 VALUES (8), (7); -CREATE TABLE t2 (a int); -INSERT INTO t2 VALUES (8), (7); -CREATE TABLE t3 (a int); -INSERT INTO t3 VALUES (8), (7); -SET @tmp_optimizer_switch=@@optimizer_switch; -set optimizer_switch=default; -set @@optimizer_switch='semijoin_with_cache=off'; -set @@optimizer_switch='outer_join_with_cache=off'; -SET optimizer_switch='derived_merge=off,derived_with_keys=off'; -SET join_cache_level=0; -EXPLAIN -SELECT * FROM (SELECT t1.* FROM t1, t2) t WHERE t.a IN (SELECT * FROM t3); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 -1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1 -3 MATERIALIZED t3 ALL NULL NULL NULL NULL 2 -2 DERIVED t1 ALL NULL NULL NULL NULL 2 -2 DERIVED t2 ALL NULL NULL NULL NULL 2 -SELECT * FROM (SELECT t1.* FROM t1, t2) t WHERE t.a IN (SELECT * FROM t3); -a -8 -8 -7 -7 -SELECT * FROM ( SELECT ta.* FROM t1 AS ta, t1 ) tb WHERE a IN ( SELECT * FROM t1 ); -a -8 -8 -7 -7 -SET SESSION join_cache_level = DEFAULT; -SET optimizer_switch=@tmp_optimizer_switch; -DROP TABLE t1,t2,t3; -# -# Bug #900469: semijoin + BNLH + ORDER BY -# -CREATE TABLE t1 (a int, b int); -INSERT INTO t1 VALUES (8,10); -CREATE TABLE t2 (c int, d int); -INSERT INTO t2 VALUES (8,10); -INSERT INTO t2 VALUES (9,11); -CREATE TABLE t3 (c int, d int); -INSERT INTO t3 VALUES (8,10); -INSERT INTO t3 VALUES (9,11); -SET @tmp_optimizer_switch=@@optimizer_switch; -set @@optimizer_switch='semijoin_with_cache=on'; -SET join_cache_level=1; -EXPLAIN -SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort -1 PRIMARY t2 ALL NULL NULL NULL NULL 2 -1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNL join) -SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d; -a b c d -8 10 8 10 -8 10 9 11 -SET join_cache_level=3; -EXPLAIN -SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 system NULL NULL NULL NULL 1 -1 PRIMARY t2 ALL NULL NULL NULL NULL 2 -1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNLH join) -SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c); -a b c d -8 10 8 10 -8 10 9 11 -SET join_cache_level=3; -EXPLAIN -SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort -1 PRIMARY t2 ALL NULL NULL NULL NULL 2 -1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNLH join) -SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d; -a b c d -8 10 8 10 -8 10 9 11 -SET SESSION join_cache_level = DEFAULT; -SET optimizer_switch=@tmp_optimizer_switch; -DROP TABLE t1,t2,t3; -# -# Bug #901478: semijoin + ORDER BY + join_cache_level=4|6 -# -CREATE TABLE t1 (a char(1)); -INSERT INTO t1 VALUES ('x'); -CREATE TABLE t2 (a int, b int, c int, KEY(a), KEY(b), KEY(c)); -INSERT INTO t2 VALUES -(9,1,0), (7,2,8), (2,3,5), (4,2,9), (8,3,8), (3,4,1), (5,5,4); -CREATE TABLE t3 (a CHAR(1)); -INSERT INTO t3 VALUES ('x'); -CREATE TABLE t4 (a int, b int, c int, KEY(b), KEY(c)); -INSERT INTO t4 VALUES -(9,1,0), (7,2,8), (2,3,5), (4,2,9), (8,3,8), (3,4,1), (5,5,4); -INSERT INTO t4 VALUES -(19,11,10), (17,12,18), (12,13,15), (14,12,19), -(18,13,18), (13,14,11), (15,15,14); -SET @tmp_optimizer_switch=@@optimizer_switch; -SET @@optimizer_switch='semijoin=on'; -SET @@optimizer_switch='firstmatch=off'; -SET @@optimizer_switch='mrr=off'; -SET @@optimizer_switch='semijoin_with_cache=off'; -set join_cache_level=1; -EXPLAIN -SELECT * FROM t1,t2 -WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND -t2.a BETWEEN 4 and 5 -ORDER BY t2.b; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 system NULL NULL NULL NULL 1 -1 PRIMARY t3 system NULL NULL NULL NULL 1 -1 PRIMARY t2 range a,c a 5 NULL 1 Using index condition; Using where; Using filesort -1 PRIMARY t4 ref c c 5 test.t2.c 2 Using where; Start temporary; End temporary -SELECT * FROM t1,t2 -WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND -t2.a BETWEEN 4 and 5 -ORDER BY t2.b; -a a b c -x 4 2 9 -x 5 5 4 -set join_cache_level=4; -EXPLAIN -SELECT * FROM t1,t2 -WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND -t2.a BETWEEN 4 and 5 -ORDER BY t2.b; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort -1 PRIMARY t3 system NULL NULL NULL NULL 1 -1 PRIMARY t2 range a,c a 5 NULL 1 Using index condition; Using where -1 PRIMARY t4 ref c c 5 test.t2.c 2 Using where; Start temporary; End temporary -SELECT * FROM t1,t2 -WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND -t2.a BETWEEN 4 and 5 -ORDER BY t2.b; -a a b c -x 4 2 9 -x 5 5 4 -SET @@optimizer_switch='semijoin_with_cache=on'; -set join_cache_level=6; -EXPLAIN -SELECT * FROM t1,t2 -WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND -t2.a BETWEEN 4 and 5 -ORDER BY t2.b; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort -1 PRIMARY t3 system NULL NULL NULL NULL 1 -1 PRIMARY t2 range a,c a 5 NULL 1 Using index condition; Using where -1 PRIMARY t4 ref c c 5 test.t2.c 2 Using where; Start temporary; End temporary -SELECT * FROM t1,t2 -WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND -t2.a BETWEEN 4 and 5 -ORDER BY t2.b; -a a b c -x 4 2 9 -x 5 5 4 -SET join_cache_level = DEFAULT; -SET optimizer_switch=@tmp_optimizer_switch; -DROP TABLE t1,t2,t3,t4; -# -# Bug#53305 Duplicate weedout + join buffer (join cache --level=7,8) -# -create table t1 (uid int, fid int, index(uid)); -insert into t1 values -(1,1), (1,2), (1,3), (1,4), -(2,5), (2,6), (2,7), (2,8), -(3,1), (3,2), (3,9); -create table t2 (uid int primary key, name varchar(128), index(name)); -insert into t2 values -(1, "A"), (2, "B"), (3, "C"), (4, "D"), (5, "E"), -(6, "F"), (7, "G"), (8, "H"), (9, "I"); -create table t3 (uid int, fid int, index(uid)); -insert into t3 values -(1,1), (1,2), (1,3),(1,4), -(2,5), (2,6), (2,7), (2,8), -(3,1), (3,2), (3,9); -set @tmp_optimizer_switch=@@optimizer_switch; -set @@optimizer_switch='semijoin=on'; -set optimizer_switch='materialization=off'; -set optimizer_switch='loosescan=off,firstmatch=off'; -set optimizer_switch='mrr_sort_keys=off'; -set join_cache_level=7; -create table t4 (uid int primary key, name varchar(128), index(name)); -insert into t4 values -(1, "A"), (2, "B"), (3, "C"), (4, "D"), (5, "E"), -(6, "F"), (7, "G"), (8, "H"), (9, "I"); -explain select name from t2, t1 -where t1.uid in (select t4.uid from t4, t3 where t3.uid=1 and t4.uid=t3.fid) -and t2.uid=t1.fid; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t3 ref uid uid 5 const 4 Using where; Start temporary -1 PRIMARY t4 eq_ref PRIMARY PRIMARY 4 test.t3.fid 1 Using index -1 PRIMARY t1 ALL uid NULL NULL NULL 11 Using where; End temporary; Using join buffer (flat, BNL join) -1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 test.t1.fid 1 Using join buffer (flat, BKAH join); Rowid-ordered scan -select name from t2, t1 -where t1.uid in (select t4.uid from t4, t3 where t3.uid=1 and t4.uid=t3.fid) -and t2.uid=t1.fid; -name -A -A -B -B -C -D -E -F -G -H -I -set join_cache_level = default; -set optimizer_switch=@tmp_optimizer_switch; -drop table t1,t2,t3,t4; -# -# Bug#50358 - semijoin execution of subquery with outerjoin -# emplying join buffer -# -CREATE TABLE t1 (i int); -CREATE TABLE t2 (i int); -CREATE TABLE t3 (i int); -INSERT INTO t1 VALUES (1), (2); -INSERT INTO t2 VALUES (6); -INSERT INTO t3 VALUES (1), (2); -set @tmp_optimizer_switch=@@optimizer_switch; -set @@optimizer_switch='semijoin=on'; -set optimizer_switch='materialization=on'; -set join_cache_level=0; -EXPLAIN -SELECT * FROM t1 WHERE t1.i IN -(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 -1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 -2 MATERIALIZED t3 ALL NULL NULL NULL NULL 2 -2 MATERIALIZED t2 ALL NULL NULL NULL NULL 1 Using where -SELECT * FROM t1 WHERE t1.i IN -(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i); -i -1 -2 -set join_cache_level=2; -EXPLAIN -SELECT * FROM t1 WHERE t1.i IN -(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 -1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 -2 MATERIALIZED t3 ALL NULL NULL NULL NULL 2 -2 MATERIALIZED t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join) -SELECT * FROM t1 WHERE t1.i IN -(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i); -i -1 -2 -set join_cache_level = default; -set optimizer_switch=@tmp_optimizer_switch; -DROP TABLE t1,t2,t3; -# -# Bug #12546542: missing row with semijoin=off + join cache -# (LP bug #922971) -# -CREATE TABLE t1 (a varchar(1024)); -INSERT INTO t1 VALUES ('v'), ('we'); -CREATE TABLE t2 ( -a varchar(1024) CHARACTER SET utf8 DEFAULT NULL, b int, c int -); -INSERT INTO t2 VALUES ('we',4,NULL), ('v',1305673728,6); -CREATE TABLE t3 (b int, c int); -INSERT INTO t3 VALUES (4,4); -set @tmp_optimizer_switch=@@optimizer_switch; -set optimizer_switch='semijoin=off'; -set optimizer_switch='materialization=off'; -set join_cache_level=0; -EXPLAIN -SELECT * FROM t1 -WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b -WHERE t2.c < 10 OR t3.c > 1); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where -2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where -2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 1 Using where -SELECT * FROM t1 -WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b -WHERE t2.c < 10 OR t3.c > 1); -a -v -we -set join_cache_level=2; -EXPLAIN -SELECT * FROM t1 -WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b -WHERE t2.c < 10 OR t3.c > 1); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where -2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where -2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join) -SELECT * FROM t1 -WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b -WHERE t2.c < 10 OR t3.c > 1); -a -v -we -set join_cache_level = default; -set optimizer_switch=@tmp_optimizer_switch; -DROP TABLE t1,t2,t3; -# -# lp:925985 LEFT JOIN with optimize_join_buffer_size=off + -# join_buffer_size > join_buffer_space_limit -# -CREATE TABLE t1 (a int); -INSERT INTO t1 VALUES (5), (3); -CREATE TABLE t2 (a int, b int); -INSERT INTO t2 VALUES -(3,30), (1,10), (7,70), (2,20), -(3,31), (1,11), (7,71), (2,21), -(3,32), (1,12), (7,72), (2,22); -CREATE TABLE t3 (b int, c int); -INSERT INTO t3 VALUES (32, 302), (42,400), (30,300); -set @tmp_optimizer_switch=@@optimizer_switch; -set optimizer_switch='optimize_join_buffer_size=off'; -set join_buffer_space_limit=4096; -set join_buffer_size=4096*2; -set join_cache_level=2; -set optimizer_switch='outer_join_with_cache=on'; -EXPLAIN -SELECT * FROM t1, t2 LEFT JOIN t3 ON t2.b=t3.b WHERE t1.a=t2.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 2 -1 SIMPLE t2 ALL NULL NULL NULL NULL 12 Using where -1 SIMPLE t3 ALL NULL NULL NULL NULL 3 Using where -SELECT * FROM t1, t2 LEFT JOIN t3 ON t2.b=t3.b WHERE t1.a=t2.a; -a a b b c -3 3 30 30 300 -3 3 31 NULL NULL -3 3 32 32 302 -set join_buffer_space_limit=default; -set join_buffer_size=default; -set join_cache_level=default; -set optimizer_switch=@tmp_optimizer_switch; -DROP TABLE t1,t2,t3; -# -# Bug #1058071: LEFT JOIN using blobs -# (MDEV-564) when join buffer size is small -# -CREATE TABLE t1 ( -col269 decimal(31,10) unsigned DEFAULT NULL, -col280 geometry DEFAULT NULL, -col281 tinyint(1) DEFAULT NULL, -col282 time NOT NULL, -col284 datetime DEFAULT NULL, -col286 date DEFAULT NULL, -col287 datetime DEFAULT NULL, -col288 decimal(30,29) DEFAULT NULL, -col291 time DEFAULT NULL, -col292 time DEFAULT NULL -) ENGINE=Aria; -INSERT INTO t1 VALUES -(0.0,PointFromText('POINT(9 0)'),0,'11:24:05','2013-04-14 21:30:28',NULL,'2011-12-20 06:00:34',9.9,'13:04:39',NULL), -(0.0,NULL,127,'05:43:12','2012-09-05 06:15:27','2027-01-01','2011-10-29 10:48:29',0.0,'06:24:05','11:33:37'), -(0.0,NULL,127,'12:54:41','2013-01-12 11:32:58','2011-11-03','2013-01-03 02:00:34',00,'11:54:15','20:19:15'), -(0.0,PointFromText('POINT(9 0)'),0,'19:48:07','2012-07-16 15:45:25','2012-03-25','2013-09-07 17:21:52',0.5,'17:36:54','21:24:19'), -(0.0,PointFromText('POINT(9 0)'),0,'03:43:48','2012-09-28 00:00:00','2012-06-26','2011-11-16 05:01:09',00,'01:25:42','19:30:06'), -(0.0,LineStringFromText('LINESTRING(0 0,9 9,0 0,9 0,0 0)'),127,'11:33:21','2012-03-31 10:29:22','2012-10-10','2012-04-21 19:21:06',NULL,'05:13:22','09:48:34'), -(NULL,PointFromText('POINT(9 0)'),127,'00:00:00','0000-00-00','2012-04-04 21:26:12','2013-03-04',0.0,'12:54:30',NULL), -(NULL,PointFromText('POINT(9 0)'),1,'00:00:00','2013-05-01 22:37:49','2013-06-26','2012-09-22 17:31:03',0.0,'08:09:57','11:15:36'); -Warnings: -Note 1265 Data truncated for column 'col286' at row 7 -CREATE TABLE t2 (b int) ENGINE=Aria; -INSERT INTO t2 VALUES (NULL); -CREATE TABLE t3 (c int) ENGINE=Aria; -INSERT INTO t3 VALUES (NULL); -set @tmp_optimizer_switch=@@optimizer_switch; -set optimizer_switch = 'outer_join_with_cache=on,join_cache_incremental=on'; -set join_buffer_size=128; -EXPLAIN -SELECT 1 AS c FROM t1 NATURAL LEFT JOIN t2 LEFT OUTER JOIN t3 ON 1 -GROUP BY elt(t1.col282,1,t1.col280); -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using temporary; Using filesort -1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join) -1 SIMPLE t3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -SELECT 1 AS c FROM t1 NATURAL LEFT JOIN t2 LEFT OUTER JOIN t3 ON 1 -GROUP BY elt(t1.col282,1,t1.col280); -c -1 -set join_buffer_size=default; -set optimizer_switch=@tmp_optimizer_switch; -DROP table t1,t2,t3; -set join_buffer_size= default; -set @@optimizer_switch=@save_optimizer_switch; -# -# MDEV-5293: outer join, join buffering, and order by - invalid query plan -# -create table t0 (a int primary key) engine=myisam; -insert into t0 values (1); -create table t1(a int) engine=myisam; -insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); -alter table t1 add b int; -create table t2 like t1; -insert into t2 select * from t1; -#The following must use "Using temporary; Using filesort" and not just "Using filesort": -explain select * from t0,t1 left join t2 on t1.b=t2.b order by t0.a, t1.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t0 system NULL NULL NULL NULL 1 Using temporary; Using filesort -1 SIMPLE t1 ALL NULL NULL NULL NULL 10 -1 SIMPLE t2 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join) -drop table t0,t1,t2; -# MDEV-6292: huge performance degradation for a sequence -# of LEFT JOIN operations when using join buffer -# -CREATE TABLE t1 ( -id int(11) NOT NULL AUTO_INCREMENT, -col1 varchar(255) NOT NULL DEFAULT '', -PRIMARY KEY (id) -) ENGINE=INNODB; -CREATE TABLE t2 ( -id int(11) NOT NULL AUTO_INCREMENT, -parent_id smallint(3) NOT NULL DEFAULT '0', -col2 varchar(25) NOT NULL DEFAULT '', -PRIMARY KEY (id) -) ENGINE=INNODB; -set join_buffer_size=8192; -set join_cache_level=0; -set @init_time:=now(); -SELECT t.* -FROM -t1 t -LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val" - LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val" - LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val" - LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val" - LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val" - LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val" - LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val" - LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val" - LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val" - LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val" - LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val" - LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val" - LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val" - LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val" - LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val" - LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val" - LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val" - LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val" - LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val" - LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val" - LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val" - LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val" - LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val" - LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val" - LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val" - LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val" - LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val" -ORDER BY -col1; -id col1 -select timestampdiff(second, @init_time, now()) <= 5; -timestampdiff(second, @init_time, now()) <= 5 -1 -set join_cache_level=2; -set @init_time:=now(); -SELECT t.* -FROM -t1 t -LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val" - LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val" - LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val" - LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val" - LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val" - LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val" - LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val" - LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val" - LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val" - LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val" - LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val" - LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val" - LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val" - LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val" - LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val" - LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val" - LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val" - LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val" - LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val" - LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val" - LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val" - LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val" - LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val" - LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val" - LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val" - LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val" - LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val" -ORDER BY -col1; -id col1 -select timestampdiff(second, @init_time, now()) <= 5; -timestampdiff(second, @init_time, now()) <= 5 -1 -EXPLAIN -SELECT t.* -FROM -t1 t -LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val" - LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val" - LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val" - LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val" - LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val" - LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val" - LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val" - LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val" - LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val" - LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val" - LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val" - LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val" - LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val" - LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val" - LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val" - LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val" - LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val" - LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val" - LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val" - LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val" - LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val" - LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val" - LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val" - LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val" - LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val" - LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val" - LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val" -ORDER BY -col1; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t ALL NULL NULL NULL NULL 1 Using temporary; Using filesort -1 SIMPLE c1 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join) -1 SIMPLE c2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c5 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c6 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c7 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c8 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c9 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c10 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c11 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c12 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c13 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c14 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c15 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c16 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c17 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c18 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c19 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c20 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c21 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c22 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c23 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c24 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c25 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c26 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -1 SIMPLE c27 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join) -set join_buffer_size=default; -set join_cache_level = default; -DROP TABLE t1,t2; -# -# MDEV-14960: BNLH used for materialized semi-join -# -CREATE TABLE t1 (i1 int); -CREATE TABLE t2 (e1 int); -CREATE TABLE t4 (e1 int); -CREATE TABLE t5 (e1 int); -INSERT INTO t1 VALUES -(1),(2),(3),(4),(5),(6),(7),(8); -INSERT INTO t1 SELECT i1+8 FROM t1; -INSERT INTO t1 SELECT i1+16 FROM t1; -INSERT INTO t1 SELECT i1+32 FROM t1; -INSERT INTO t1 SELECT i1+64 FROM t1; -INSERT INTO t2 SELECT * FROM t1; -INSERT INTO t4 SELECT * FROM t1; -INSERT INTO t5 SELECT * FROM t1; -set @save_optimizer_switch= @@optimizer_switch; -SET join_cache_level = 6; -SET join_buffer_size=4096; -SET join_buffer_space_limit=4096; -SET optimizer_switch = 'join_cache_hashed=on,optimize_join_buffer_size=on'; -EXPLAIN SELECT * FROM t1 -WHERE -i1 < 10 AND -i1 IN -(SELECT i1 FROM -(SELECT (t4.e1) i1 FROM t4 -LEFT JOIN t5 ON t4.e1 = t5.e1 -LEFT JOIN (SELECT e1 FROM t2 ) AS d ON t4.e1 = d.e1) a); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 128 Using where -1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 -2 MATERIALIZED t4 ALL NULL NULL NULL NULL 128 -2 MATERIALIZED t5 hash_ALL NULL #hash#$hj 5 test.t4.e1 128 Using where; Using join buffer (flat, BNLH join) -2 MATERIALIZED t2 hash_ALL NULL #hash#$hj 5 test.t4.e1 128 Using where; Using join buffer (incremental, BNLH join) -SELECT * FROM t1 -WHERE -i1 < 10 AND -i1 IN -(SELECT i1 FROM -(SELECT (t4.e1) i1 FROM t4 -LEFT JOIN t5 ON t4.e1 = t5.e1 -LEFT JOIN (SELECT e1 FROM t2 ) AS d ON t4.e1 = d.e1) a); -i1 -1 -2 -3 -4 -5 -6 -7 -8 -9 -SET join_cache_level = default; -SET join_buffer_size = default; -SET join_buffer_space_limit= default; -set optimizer_switch=@save_optimizer_switch; -DROP TABLE t1,t4,t5,t2; -# -# MDEV-5123 Remove duplicated conditions pushed both to join_tab->select_cond and join_tab->cache_select->cond for blocked joins. -# -set join_cache_level=default; -set expensive_subquery_limit=0; -create table t1 (c1 int); -create table t2 (c2 int); -create table t3 (c3 int); -insert into t1 values (1), (2); -insert into t2 values (1), (2); -insert into t3 values (2); -explain -select count(*) from t1 straight_join t2 -where c1 = c2-0 and c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1); -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 -1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join) -2 UNCACHEABLE SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE -set @counter=0; -select count(*) from t1 straight_join t2 -where c1 = c2-0 and c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1); -count(*) -2 -select @counter; -@counter -2 -explain -select count(*) from t1 straight_join t2 -where c1 = c2-0 and -c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1) and -c2 / 2 = 1; -id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY t1 ALL NULL NULL NULL NULL 2 -1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join) -2 UNCACHEABLE SUBQUERY t3 system NULL NULL NULL NULL 1 -set @counter=0; -select count(*) from t1 straight_join t2 -where c1 = c2-0 and -c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1) and -c2 / 2 = 1; -count(*) -1 -select @counter; -@counter -2 -drop table t1,t2,t3; -set expensive_subquery_limit=default; -# -# MDEV-6071: EXPLAIN chooses to use join buffer while execution turns it down -# -create table t1 (a int); -insert into t1 values -(7), (9), (1), (4), (2), (3), (5), (8), (11), (6), (10); -explain select count(*) from t1, t1 t2 where t1.a=t2.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 11 -1 SIMPLE t2 ALL NULL NULL NULL NULL 11 Using where; Using join buffer (flat, BNL join) -set join_buffer_space_limit=1024*8; -select @@join_buffer_space_limit; -@@join_buffer_space_limit -8192 -select @@join_buffer_size; -@@join_buffer_size -262144 -explain select count(*) from t1, t1 t2 where t1.a=t2.a; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ALL NULL NULL NULL NULL 11 -1 SIMPLE t2 ALL NULL NULL NULL NULL 11 Using where -set join_buffer_space_limit=default; -drop table t1; -# -# MDEV-6687: Assertion `0' failed in Protocol::end_statement on query -# -SET join_cache_level = 3; -# The following should have -# - table order PROFILING,user, -# - table user accessed with hash_ALL: -explain -SELECT * FROM INFORMATION_SCHEMA.PROFILING, mysql.user WHERE password_expired = PAGE_FAULTS_MINOR; -id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE PROFILING ALL NULL NULL NULL NULL NULL Using where -1 SIMPLE user hash_ALL NULL #hash#$hj 1 information_schema.PROFILING.PAGE_FAULTS_MINOR 4 Using where; Using join buffer (flat, BNLH join) -set join_cache_level=default; -create table t1 (c1 date not null, key (c1)) engine=innodb; -insert t1 values ('2017-12-27'); -create table t2 (pk int, f1 int, f2 int); -insert t2 values (4,1,1), (6,1,1); -set join_buffer_size = 222222208; -select f2 from t2,t1 where f2 = 0; -f2 -drop table t1, t2; -set join_buffer_size = default; -set @@optimizer_switch=@save_optimizer_switch; |