SET SESSION STORAGE_ENGINE='InnoDB'; set @save_optimizer_switch_for_selectivity_test=@@optimizer_switch; set optimizer_switch='extended_keys=on'; drop table if exists t0,t1,t2,t3; select @@global.use_stat_tables; @@global.use_stat_tables COMPLEMENTARY select @@session.use_stat_tables; @@session.use_stat_tables COMPLEMENTARY set @save_use_stat_tables=@@use_stat_tables; set use_stat_tables='preferably'; set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity; set @save_histogram_size=@@histogram_size; set @save_histogram_type=@@histogram_type; set optimizer_use_condition_selectivity=3; create table t1 (a int); insert into t1 values (9), (3), (2), (NULL), (NULL), (2), (NULL), (1), (5), (NULL); analyze table t1; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK select * from mysql.column_stats; db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size hist_type histogram test t1 a 1 9 0.4000 4.0000 1.2000 0 NULL NULL flush table t1; explain extended select * from t1 where a is null; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 10 40.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where isnull(`test`.`t1`.`a`) explain extended select * from t1 where a is not null; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 10 60.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` is not null) drop table t1; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP DATABASE IF EXISTS dbt3_s001; CREATE DATABASE dbt3_s001; use dbt3_s001; === Q2 === set optimizer_use_condition_selectivity=5; explain extended select s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, s_phone, s_comment from part, supplier, partsupp, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and p_size = 9 and p_type like '%TIN' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' and ps_supplycost = ( select min(ps_supplycost) from partsupp, supplier, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY part ALL PRIMARY NULL NULL NULL 200 0.31 Using where; Using temporary; Using filesort 1 PRIMARY region ALL PRIMARY NULL NULL NULL 5 20.00 Using where; Using join buffer (flat, BNL join) 1 PRIMARY partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where 1 PRIMARY supplier eq_ref PRIMARY,i_s_nationkey PRIMARY 4 dbt3_s001.partsupp.ps_suppkey 1 100.00 Using where 1 PRIMARY nation eq_ref PRIMARY,i_n_regionkey PRIMARY 4 dbt3_s001.supplier.s_nationkey 1 100.00 Using where 2 DEPENDENT SUBQUERY region ALL PRIMARY NULL NULL NULL 5 20.00 Using where 2 DEPENDENT SUBQUERY partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 2 DEPENDENT SUBQUERY supplier eq_ref PRIMARY,i_s_nationkey PRIMARY 4 dbt3_s001.partsupp.ps_suppkey 1 100.00 Using where 2 DEPENDENT SUBQUERY nation eq_ref PRIMARY,i_n_regionkey PRIMARY 4 dbt3_s001.supplier.s_nationkey 1 100.00 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.part.p_partkey' of SELECT #2 was resolved in SELECT #1 Note 1003 select `dbt3_s001`.`supplier`.`s_acctbal` AS `s_acctbal`,`dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`nation`.`n_name` AS `n_name`,`dbt3_s001`.`part`.`p_partkey` AS `p_partkey`,`dbt3_s001`.`part`.`p_mfgr` AS `p_mfgr`,`dbt3_s001`.`supplier`.`s_address` AS `s_address`,`dbt3_s001`.`supplier`.`s_phone` AS `s_phone`,`dbt3_s001`.`supplier`.`s_comment` AS `s_comment` from `dbt3_s001`.`part` join `dbt3_s001`.`supplier` join `dbt3_s001`.`partsupp` join `dbt3_s001`.`nation` join `dbt3_s001`.`region` where ((`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`supplier`.`s_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`part`.`p_size` = 9) and (`dbt3_s001`.`nation`.`n_nationkey` = `dbt3_s001`.`supplier`.`s_nationkey`) and (`dbt3_s001`.`nation`.`n_regionkey` = `dbt3_s001`.`region`.`r_regionkey`) and (`dbt3_s001`.`region`.`r_name` = 'ASIA') and (`dbt3_s001`.`part`.`p_type` like '%TIN') and (`dbt3_s001`.`partsupp`.`ps_supplycost` = <`dbt3_s001`.`part`.`p_partkey`>((select min(`dbt3_s001`.`partsupp`.`ps_supplycost`) from `dbt3_s001`.`partsupp` join `dbt3_s001`.`supplier` join `dbt3_s001`.`nation` join `dbt3_s001`.`region` where ((`dbt3_s001`.`supplier`.`s_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`nation`.`n_nationkey` = `dbt3_s001`.`supplier`.`s_nationkey`) and (`dbt3_s001`.`nation`.`n_regionkey` = `dbt3_s001`.`region`.`r_regionkey`) and (`dbt3_s001`.`region`.`r_name` = 'ASIA') and (`dbt3_s001`.`part`.`p_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`)))))) order by `dbt3_s001`.`supplier`.`s_acctbal` desc,`dbt3_s001`.`nation`.`n_name`,`dbt3_s001`.`supplier`.`s_name`,`dbt3_s001`.`part`.`p_partkey` set optimizer_use_condition_selectivity=4; explain extended select s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, s_phone, s_comment from part, supplier, partsupp, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and p_size = 9 and p_type like '%TIN' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' and ps_supplycost = ( select min(ps_supplycost) from partsupp, supplier, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY region ALL PRIMARY NULL NULL NULL 5 20.00 Using where; Using temporary; Using filesort 1 PRIMARY part ALL PRIMARY NULL NULL NULL 200 2.08 Using where; Using join buffer (flat, BNL join) 1 PRIMARY partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where 1 PRIMARY supplier eq_ref PRIMARY,i_s_nationkey PRIMARY 4 dbt3_s001.partsupp.ps_suppkey 1 100.00 Using where 1 PRIMARY nation eq_ref PRIMARY,i_n_regionkey PRIMARY 4 dbt3_s001.supplier.s_nationkey 1 100.00 Using where 2 DEPENDENT SUBQUERY region ALL PRIMARY NULL NULL NULL 5 20.00 Using where 2 DEPENDENT SUBQUERY partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 2 DEPENDENT SUBQUERY supplier eq_ref PRIMARY,i_s_nationkey PRIMARY 4 dbt3_s001.partsupp.ps_suppkey 1 100.00 Using where 2 DEPENDENT SUBQUERY nation eq_ref PRIMARY,i_n_regionkey PRIMARY 4 dbt3_s001.supplier.s_nationkey 1 100.00 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.part.p_partkey' of SELECT #2 was resolved in SELECT #1 Note 1003 select `dbt3_s001`.`supplier`.`s_acctbal` AS `s_acctbal`,`dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`nation`.`n_name` AS `n_name`,`dbt3_s001`.`part`.`p_partkey` AS `p_partkey`,`dbt3_s001`.`part`.`p_mfgr` AS `p_mfgr`,`dbt3_s001`.`supplier`.`s_address` AS `s_address`,`dbt3_s001`.`supplier`.`s_phone` AS `s_phone`,`dbt3_s001`.`supplier`.`s_comment` AS `s_comment` from `dbt3_s001`.`part` join `dbt3_s001`.`supplier` join `dbt3_s001`.`partsupp` join `dbt3_s001`.`nation` join `dbt3_s001`.`region` where ((`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`supplier`.`s_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`part`.`p_size` = 9) and (`dbt3_s001`.`nation`.`n_nationkey` = `dbt3_s001`.`supplier`.`s_nationkey`) and (`dbt3_s001`.`nation`.`n_regionkey` = `dbt3_s001`.`region`.`r_regionkey`) and (`dbt3_s001`.`region`.`r_name` = 'ASIA') and (`dbt3_s001`.`part`.`p_type` like '%TIN') and (`dbt3_s001`.`partsupp`.`ps_supplycost` = <`dbt3_s001`.`part`.`p_partkey`>((select min(`dbt3_s001`.`partsupp`.`ps_supplycost`) from `dbt3_s001`.`partsupp` join `dbt3_s001`.`supplier` join `dbt3_s001`.`nation` join `dbt3_s001`.`region` where ((`dbt3_s001`.`supplier`.`s_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`nation`.`n_nationkey` = `dbt3_s001`.`supplier`.`s_nationkey`) and (`dbt3_s001`.`nation`.`n_regionkey` = `dbt3_s001`.`region`.`r_regionkey`) and (`dbt3_s001`.`region`.`r_name` = 'ASIA') and (`dbt3_s001`.`part`.`p_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`)))))) order by `dbt3_s001`.`supplier`.`s_acctbal` desc,`dbt3_s001`.`nation`.`n_name`,`dbt3_s001`.`supplier`.`s_name`,`dbt3_s001`.`part`.`p_partkey` === Q15 === create view revenue0 (supplier_no, total_revenue) as select l_suppkey, sum(l_extendedprice * (1 - l_discount)) from lineitem where l_shipdate >= '1995-08-01' and l_shipdate < date_add('1995-08-01', interval 90 day) group by l_suppkey; set @save_optimizer_switch=@@optimizer_switch; set optimizer_switch='index_condition_pushdown=off'; set optimizer_use_condition_selectivity=1; EXPLAIN EXTENDED select s_suppkey, s_name, s_address, s_phone, total_revenue from supplier, revenue0 where s_suppkey = supplier_no and total_revenue = (select max(total_revenue) from revenue0) order by s_suppkey; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY supplier index PRIMARY PRIMARY 4 NULL 10 100.00 1 PRIMARY ref key0 key0 5 dbt3_s001.supplier.s_suppkey 10 100.00 Using where 3 DERIVED lineitem range i_l_shipdate i_l_shipdate 4 NULL 228 100.00 Using where; Using temporary; Using filesort 2 SUBQUERY ALL NULL NULL NULL NULL 228 100.00 4 DERIVED lineitem range i_l_shipdate i_l_shipdate 4 NULL 228 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 select `dbt3_s001`.`supplier`.`s_suppkey` AS `s_suppkey`,`dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address`,`dbt3_s001`.`supplier`.`s_phone` AS `s_phone`,`revenue0`.`total_revenue` AS `total_revenue` from `dbt3_s001`.`supplier` join `dbt3_s001`.`revenue0` where ((`revenue0`.`supplier_no` = `dbt3_s001`.`supplier`.`s_suppkey`) and (`revenue0`.`total_revenue` = (select max(`revenue0`.`total_revenue`) from `dbt3_s001`.`revenue0`))) order by `dbt3_s001`.`supplier`.`s_suppkey` select s_suppkey, s_name, s_address, s_phone, total_revenue from supplier, revenue0 where s_suppkey = supplier_no and total_revenue = (select max(total_revenue) from revenue0) order by s_suppkey; s_suppkey s_name s_address s_phone total_revenue 1 Supplier#000000001 N kD4on9OM Ipw3,gf0JBoQDd7tgrzrddZ 27-918-335-1736 729084.7773 set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED select s_suppkey, s_name, s_address, s_phone, total_revenue from supplier, revenue0 where s_suppkey = supplier_no and total_revenue = (select max(total_revenue) from revenue0) order by s_suppkey; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY supplier index PRIMARY PRIMARY 4 NULL 10 100.00 1 PRIMARY ref key0 key0 5 dbt3_s001.supplier.s_suppkey 10 100.00 Using where 3 DERIVED lineitem range i_l_shipdate i_l_shipdate 4 NULL 228 100.00 Using where; Using temporary; Using filesort 2 SUBQUERY ALL NULL NULL NULL NULL 227 100.00 4 DERIVED lineitem range i_l_shipdate i_l_shipdate 4 NULL 228 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 select `dbt3_s001`.`supplier`.`s_suppkey` AS `s_suppkey`,`dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address`,`dbt3_s001`.`supplier`.`s_phone` AS `s_phone`,`revenue0`.`total_revenue` AS `total_revenue` from `dbt3_s001`.`supplier` join `dbt3_s001`.`revenue0` where ((`revenue0`.`supplier_no` = `dbt3_s001`.`supplier`.`s_suppkey`) and (`revenue0`.`total_revenue` = (select max(`revenue0`.`total_revenue`) from `dbt3_s001`.`revenue0`))) order by `dbt3_s001`.`supplier`.`s_suppkey` select s_suppkey, s_name, s_address, s_phone, total_revenue from supplier, revenue0 where s_suppkey = supplier_no and total_revenue = (select max(total_revenue) from revenue0) order by s_suppkey; s_suppkey s_name s_address s_phone total_revenue 1 Supplier#000000001 N kD4on9OM Ipw3,gf0JBoQDd7tgrzrddZ 27-918-335-1736 729084.7773 set optimizer_switch=@save_optimizer_switch; drop view revenue0; === Q16 === set optimizer_use_condition_selectivity=1; EXPLAIN EXTENDED select p_brand, p_type, p_size, count(distinct ps_suppkey) as supplier_cnt from partsupp, part where p_partkey = ps_partkey and p_brand <> 'Brand#11' and p_type not like 'SMALL POLISHED%' and p_size in (49, 37, 27, 5, 40, 6, 22, 8) and ps_suppkey not in (select s_suppkey from supplier where s_comment like '%Customer%Complaints%') group by p_brand, p_type, p_size order by supplier_cnt desc, p_brand, p_type, p_size; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY part ALL PRIMARY NULL NULL NULL 200 100.00 Using where; Using temporary; Using filesort 1 PRIMARY partsupp ref PRIMARY,i_ps_partkey i_ps_partkey 4 dbt3_s001.part.p_partkey 3 100.00 Using where; Using index 2 MATERIALIZED supplier ALL PRIMARY NULL NULL NULL 10 100.00 Using where Warnings: Note 1003 select `dbt3_s001`.`part`.`p_brand` AS `p_brand`,`dbt3_s001`.`part`.`p_type` AS `p_type`,`dbt3_s001`.`part`.`p_size` AS `p_size`,count(distinct `dbt3_s001`.`partsupp`.`ps_suppkey`) AS `supplier_cnt` from `dbt3_s001`.`partsupp` join `dbt3_s001`.`part` where ((`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`part`.`p_brand` <> 'Brand#11') and (not((`dbt3_s001`.`part`.`p_type` like 'SMALL POLISHED%'))) and (`dbt3_s001`.`part`.`p_size` in (49,37,27,5,40,6,22,8)) and (not(<`dbt3_s001`.`partsupp`.`ps_suppkey`>((`dbt3_s001`.`partsupp`.`ps_suppkey`,`dbt3_s001`.`partsupp`.`ps_suppkey` in ( (select `dbt3_s001`.`supplier`.`s_suppkey` from `dbt3_s001`.`supplier` where (`dbt3_s001`.`supplier`.`s_comment` like '%Customer%Complaints%') ), (`dbt3_s001`.`partsupp`.`ps_suppkey` in on distinct_key where ((`dbt3_s001`.`partsupp`.`ps_suppkey` = ``.`s_suppkey`))))))))) group by `dbt3_s001`.`part`.`p_brand`,`dbt3_s001`.`part`.`p_type`,`dbt3_s001`.`part`.`p_size` order by count(distinct `dbt3_s001`.`partsupp`.`ps_suppkey`) desc,`dbt3_s001`.`part`.`p_brand`,`dbt3_s001`.`part`.`p_type`,`dbt3_s001`.`part`.`p_size` select p_brand, p_type, p_size, count(distinct ps_suppkey) as supplier_cnt from partsupp, part where p_partkey = ps_partkey and p_brand <> 'Brand#11' and p_type not like 'SMALL POLISHED%' and p_size in (49, 37, 27, 5, 40, 6, 22, 8) and ps_suppkey not in (select s_suppkey from supplier where s_comment like '%Customer%Complaints%') group by p_brand, p_type, p_size order by supplier_cnt desc, p_brand, p_type, p_size; p_brand p_type p_size supplier_cnt Brand#21 MEDIUM ANODIZED TIN 8 4 Brand#22 PROMO PLATED TIN 5 4 Brand#24 MEDIUM BURNISHED NICKEL 6 4 Brand#24 SMALL ANODIZED STEEL 40 4 Brand#32 MEDIUM BURNISHED BRASS 49 4 Brand#33 MEDIUM POLISHED BRASS 49 4 Brand#41 STANDARD BRUSHED NICKEL 40 4 Brand#44 PROMO POLISHED STEEL 5 4 Brand#45 PROMO ANODIZED BRASS 22 4 Brand#53 STANDARD BRUSHED STEEL 27 4 Brand#54 MEDIUM POLISHED BRASS 22 4 Brand#54 STANDARD ANODIZED BRASS 22 4 Brand#13 LARGE BRUSHED STEEL 8 2 Brand#25 ECONOMY BURNISHED COPPER 27 2 Brand#44 STANDARD PLATED TIN 37 1 Brand#51 ECONOMY POLISHED STEEL 49 1 set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED select p_brand, p_type, p_size, count(distinct ps_suppkey) as supplier_cnt from partsupp, part where p_partkey = ps_partkey and p_brand <> 'Brand#11' and p_type not like 'SMALL POLISHED%' and p_size in (49, 37, 27, 5, 40, 6, 22, 8) and ps_suppkey not in (select s_suppkey from supplier where s_comment like '%Customer%Complaints%') group by p_brand, p_type, p_size order by supplier_cnt desc, p_brand, p_type, p_size; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY part ALL PRIMARY NULL NULL NULL 200 16.67 Using where; Using temporary; Using filesort 1 PRIMARY partsupp ref PRIMARY,i_ps_partkey i_ps_partkey 4 dbt3_s001.part.p_partkey 3 100.00 Using where; Using index 2 MATERIALIZED supplier ALL PRIMARY NULL NULL NULL 10 100.00 Using where Warnings: Note 1003 select `dbt3_s001`.`part`.`p_brand` AS `p_brand`,`dbt3_s001`.`part`.`p_type` AS `p_type`,`dbt3_s001`.`part`.`p_size` AS `p_size`,count(distinct `dbt3_s001`.`partsupp`.`ps_suppkey`) AS `supplier_cnt` from `dbt3_s001`.`partsupp` join `dbt3_s001`.`part` where ((`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`part`.`p_brand` <> 'Brand#11') and (not((`dbt3_s001`.`part`.`p_type` like 'SMALL POLISHED%'))) and (`dbt3_s001`.`part`.`p_size` in (49,37,27,5,40,6,22,8)) and (not(<`dbt3_s001`.`partsupp`.`ps_suppkey`>((`dbt3_s001`.`partsupp`.`ps_suppkey`,`dbt3_s001`.`partsupp`.`ps_suppkey` in ( (select `dbt3_s001`.`supplier`.`s_suppkey` from `dbt3_s001`.`supplier` where (`dbt3_s001`.`supplier`.`s_comment` like '%Customer%Complaints%') ), (`dbt3_s001`.`partsupp`.`ps_suppkey` in on distinct_key where ((`dbt3_s001`.`partsupp`.`ps_suppkey` = ``.`s_suppkey`))))))))) group by `dbt3_s001`.`part`.`p_brand`,`dbt3_s001`.`part`.`p_type`,`dbt3_s001`.`part`.`p_size` order by count(distinct `dbt3_s001`.`partsupp`.`ps_suppkey`) desc,`dbt3_s001`.`part`.`p_brand`,`dbt3_s001`.`part`.`p_type`,`dbt3_s001`.`part`.`p_size` select p_brand, p_type, p_size, count(distinct ps_suppkey) as supplier_cnt from partsupp, part where p_partkey = ps_partkey and p_brand <> 'Brand#11' and p_type not like 'SMALL POLISHED%' and p_size in (49, 37, 27, 5, 40, 6, 22, 8) and ps_suppkey not in (select s_suppkey from supplier where s_comment like '%Customer%Complaints%') group by p_brand, p_type, p_size order by supplier_cnt desc, p_brand, p_type, p_size; p_brand p_type p_size supplier_cnt Brand#21 MEDIUM ANODIZED TIN 8 4 Brand#22 PROMO PLATED TIN 5 4 Brand#24 MEDIUM BURNISHED NICKEL 6 4 Brand#24 SMALL ANODIZED STEEL 40 4 Brand#32 MEDIUM BURNISHED BRASS 49 4 Brand#33 MEDIUM POLISHED BRASS 49 4 Brand#41 STANDARD BRUSHED NICKEL 40 4 Brand#44 PROMO POLISHED STEEL 5 4 Brand#45 PROMO ANODIZED BRASS 22 4 Brand#53 STANDARD BRUSHED STEEL 27 4 Brand#54 MEDIUM POLISHED BRASS 22 4 Brand#54 STANDARD ANODIZED BRASS 22 4 Brand#13 LARGE BRUSHED STEEL 8 2 Brand#25 ECONOMY BURNISHED COPPER 27 2 Brand#44 STANDARD PLATED TIN 37 1 Brand#51 ECONOMY POLISHED STEEL 49 1 set optimizer_use_condition_selectivity=4; EXPLAIN EXTENDED select p_brand, p_type, p_size, count(distinct ps_suppkey) as supplier_cnt from partsupp, part where p_partkey = ps_partkey and p_brand <> 'Brand#11' and p_type not like 'SMALL POLISHED%' and p_size in (49, 37, 27, 5, 40, 6, 22, 8) and ps_suppkey not in (select s_suppkey from supplier where s_comment like '%Customer%Complaints%') group by p_brand, p_type, p_size order by supplier_cnt desc, p_brand, p_type, p_size; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY part ALL PRIMARY NULL NULL NULL 200 16.67 Using where; Using temporary; Using filesort 1 PRIMARY partsupp ref PRIMARY,i_ps_partkey i_ps_partkey 4 dbt3_s001.part.p_partkey 3 100.00 Using where; Using index 2 MATERIALIZED supplier ALL PRIMARY NULL NULL NULL 10 100.00 Using where Warnings: Note 1003 select `dbt3_s001`.`part`.`p_brand` AS `p_brand`,`dbt3_s001`.`part`.`p_type` AS `p_type`,`dbt3_s001`.`part`.`p_size` AS `p_size`,count(distinct `dbt3_s001`.`partsupp`.`ps_suppkey`) AS `supplier_cnt` from `dbt3_s001`.`partsupp` join `dbt3_s001`.`part` where ((`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`part`.`p_brand` <> 'Brand#11') and (not((`dbt3_s001`.`part`.`p_type` like 'SMALL POLISHED%'))) and (`dbt3_s001`.`part`.`p_size` in (49,37,27,5,40,6,22,8)) and (not(<`dbt3_s001`.`partsupp`.`ps_suppkey`>((`dbt3_s001`.`partsupp`.`ps_suppkey`,`dbt3_s001`.`partsupp`.`ps_suppkey` in ( (select `dbt3_s001`.`supplier`.`s_suppkey` from `dbt3_s001`.`supplier` where (`dbt3_s001`.`supplier`.`s_comment` like '%Customer%Complaints%') ), (`dbt3_s001`.`partsupp`.`ps_suppkey` in on distinct_key where ((`dbt3_s001`.`partsupp`.`ps_suppkey` = ``.`s_suppkey`))))))))) group by `dbt3_s001`.`part`.`p_brand`,`dbt3_s001`.`part`.`p_type`,`dbt3_s001`.`part`.`p_size` order by count(distinct `dbt3_s001`.`partsupp`.`ps_suppkey`) desc,`dbt3_s001`.`part`.`p_brand`,`dbt3_s001`.`part`.`p_type`,`dbt3_s001`.`part`.`p_size` select p_brand, p_type, p_size, count(distinct ps_suppkey) as supplier_cnt from partsupp, part where p_partkey = ps_partkey and p_brand <> 'Brand#11' and p_type not like 'SMALL POLISHED%' and p_size in (49, 37, 27, 5, 40, 6, 22, 8) and ps_suppkey not in (select s_suppkey from supplier where s_comment like '%Customer%Complaints%') group by p_brand, p_type, p_size order by supplier_cnt desc, p_brand, p_type, p_size; p_brand p_type p_size supplier_cnt Brand#21 MEDIUM ANODIZED TIN 8 4 Brand#22 PROMO PLATED TIN 5 4 Brand#24 MEDIUM BURNISHED NICKEL 6 4 Brand#24 SMALL ANODIZED STEEL 40 4 Brand#32 MEDIUM BURNISHED BRASS 49 4 Brand#33 MEDIUM POLISHED BRASS 49 4 Brand#41 STANDARD BRUSHED NICKEL 40 4 Brand#44 PROMO POLISHED STEEL 5 4 Brand#45 PROMO ANODIZED BRASS 22 4 Brand#53 STANDARD BRUSHED STEEL 27 4 Brand#54 MEDIUM POLISHED BRASS 22 4 Brand#54 STANDARD ANODIZED BRASS 22 4 Brand#13 LARGE BRUSHED STEEL 8 2 Brand#25 ECONOMY BURNISHED COPPER 27 2 Brand#44 STANDARD PLATED TIN 37 1 Brand#51 ECONOMY POLISHED STEEL 49 1 === Q18 === set optimizer_use_condition_selectivity=1; EXPLAIN EXTENDED select c_name, c_custkey, o_orderkey, o_orderdate, o_totalprice, sum(l_quantity) from customer, orders, lineitem where o_orderkey in (select l_orderkey from lineitem group by l_orderkey having sum(l_quantity) > 250) and c_custkey = o_custkey and o_orderkey = l_orderkey group by c_name, c_custkey, o_orderkey, o_orderdate, o_totalprice order by o_totalprice desc, o_orderdate; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY orders ALL PRIMARY,i_o_custkey NULL NULL NULL 1500 100.00 Using where; Using temporary; Using filesort 1 PRIMARY eq_ref distinct_key distinct_key 4 dbt3_s001.orders.o_orderkey 1 100.00 1 PRIMARY customer eq_ref PRIMARY PRIMARY 4 dbt3_s001.orders.o_custkey 1 100.00 1 PRIMARY lineitem ref PRIMARY,i_l_orderkey,i_l_orderkey_quantity i_l_orderkey_quantity 4 dbt3_s001.orders.o_orderkey 4 100.00 Using index 2 MATERIALIZED lineitem index NULL PRIMARY 8 NULL 6005 100.00 Warnings: Note 1003 select `dbt3_s001`.`customer`.`c_name` AS `c_name`,`dbt3_s001`.`customer`.`c_custkey` AS `c_custkey`,`dbt3_s001`.`orders`.`o_orderkey` AS `o_orderkey`,`dbt3_s001`.`orders`.`o_orderDATE` AS `o_orderdate`,`dbt3_s001`.`orders`.`o_totalprice` AS `o_totalprice`,sum(`dbt3_s001`.`lineitem`.`l_quantity`) AS `sum(l_quantity)` from (select `dbt3_s001`.`lineitem`.`l_orderkey` from `dbt3_s001`.`lineitem` group by `dbt3_s001`.`lineitem`.`l_orderkey` having (sum(`dbt3_s001`.`lineitem`.`l_quantity`) > 250)) join `dbt3_s001`.`customer` join `dbt3_s001`.`orders` join `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`customer`.`c_custkey` = `dbt3_s001`.`orders`.`o_custkey`) and (``.`l_orderkey` = `dbt3_s001`.`orders`.`o_orderkey`) and (`dbt3_s001`.`lineitem`.`l_orderkey` = `dbt3_s001`.`orders`.`o_orderkey`)) group by `dbt3_s001`.`customer`.`c_name`,`dbt3_s001`.`customer`.`c_custkey`,`dbt3_s001`.`orders`.`o_orderkey`,`dbt3_s001`.`orders`.`o_orderDATE`,`dbt3_s001`.`orders`.`o_totalprice` order by `dbt3_s001`.`orders`.`o_totalprice` desc,`dbt3_s001`.`orders`.`o_orderDATE` select c_name, c_custkey, o_orderkey, o_orderdate, o_totalprice, sum(l_quantity) from customer, orders, lineitem where o_orderkey in (select l_orderkey from lineitem group by l_orderkey having sum(l_quantity) > 250) and c_custkey = o_custkey and o_orderkey = l_orderkey group by c_name, c_custkey, o_orderkey, o_orderdate, o_totalprice order by o_totalprice desc, o_orderdate; c_name c_custkey o_orderkey o_orderdate o_totalprice sum(l_quantity) Customer#000000070 70 2567 1998-02-27 263411.29 266 Customer#000000010 10 4421 1997-04-04 258779.02 255 Customer#000000082 82 3460 1995-10-03 245976.74 254 Customer#000000068 68 2208 1995-05-01 245388.06 256 set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED select c_name, c_custkey, o_orderkey, o_orderdate, o_totalprice, sum(l_quantity) from customer, orders, lineitem where o_orderkey in (select l_orderkey from lineitem group by l_orderkey having sum(l_quantity) > 250) and c_custkey = o_custkey and o_orderkey = l_orderkey group by c_name, c_custkey, o_orderkey, o_orderdate, o_totalprice order by o_totalprice desc, o_orderdate; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY ALL distinct_key NULL NULL NULL 6005 0.00 Using temporary; Using filesort 1 PRIMARY orders eq_ref PRIMARY,i_o_custkey PRIMARY 4 .l_orderkey 1 100.00 Using where 1 PRIMARY customer eq_ref PRIMARY PRIMARY 4 dbt3_s001.orders.o_custkey 1 100.00 1 PRIMARY lineitem ref PRIMARY,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 .l_orderkey 4 100.00 2 MATERIALIZED lineitem index NULL PRIMARY 8 NULL 6005 100.00 Warnings: Note 1003 select `dbt3_s001`.`customer`.`c_name` AS `c_name`,`dbt3_s001`.`customer`.`c_custkey` AS `c_custkey`,`dbt3_s001`.`orders`.`o_orderkey` AS `o_orderkey`,`dbt3_s001`.`orders`.`o_orderDATE` AS `o_orderdate`,`dbt3_s001`.`orders`.`o_totalprice` AS `o_totalprice`,sum(`dbt3_s001`.`lineitem`.`l_quantity`) AS `sum(l_quantity)` from (select `dbt3_s001`.`lineitem`.`l_orderkey` from `dbt3_s001`.`lineitem` group by `dbt3_s001`.`lineitem`.`l_orderkey` having (sum(`dbt3_s001`.`lineitem`.`l_quantity`) > 250)) join `dbt3_s001`.`customer` join `dbt3_s001`.`orders` join `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`customer`.`c_custkey` = `dbt3_s001`.`orders`.`o_custkey`) and (`dbt3_s001`.`orders`.`o_orderkey` = ``.`l_orderkey`) and (`dbt3_s001`.`lineitem`.`l_orderkey` = ``.`l_orderkey`)) group by `dbt3_s001`.`customer`.`c_name`,`dbt3_s001`.`customer`.`c_custkey`,`dbt3_s001`.`orders`.`o_orderkey`,`dbt3_s001`.`orders`.`o_orderDATE`,`dbt3_s001`.`orders`.`o_totalprice` order by `dbt3_s001`.`orders`.`o_totalprice` desc,`dbt3_s001`.`orders`.`o_orderDATE` select c_name, c_custkey, o_orderkey, o_orderdate, o_totalprice, sum(l_quantity) from customer, orders, lineitem where o_orderkey in (select l_orderkey from lineitem group by l_orderkey having sum(l_quantity) > 250) and c_custkey = o_custkey and o_orderkey = l_orderkey group by c_name, c_custkey, o_orderkey, o_orderdate, o_totalprice order by o_totalprice desc, o_orderdate; c_name c_custkey o_orderkey o_orderdate o_totalprice sum(l_quantity) Customer#000000070 70 2567 1998-02-27 263411.29 266 Customer#000000010 10 4421 1997-04-04 258779.02 255 Customer#000000082 82 3460 1995-10-03 245976.74 254 Customer#000000068 68 2208 1995-05-01 245388.06 256 === Q22 === set optimizer_use_condition_selectivity=1; EXPLAIN EXTENDED select cntrycode, count(*) as numcust, sum(c_acctbal) as totacctbal from ( select substr(c_phone, 1, 2) as cntrycode, c_acctbal from customer where substr(c_phone, 1, 2) in ('10', '20', '14', '19', '11', '28', '25') and c_acctbal > (select avg(c_acctbal) from customer where c_acctbal > 0.00 and substr(c_phone, 1, 2) in ('10', '20', '14', '19', '11', '28', '25')) and not exists (select * from orders where o_custkey = c_custkey) ) as vip group by cntrycode order by cntrycode; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY customer ALL NULL NULL NULL NULL 150 100.00 Using where; Using temporary; Using filesort 4 DEPENDENT SUBQUERY orders ref i_o_custkey i_o_custkey 5 dbt3_s001.customer.c_custkey 15 100.00 Using index 3 SUBQUERY customer ALL NULL NULL NULL NULL 150 100.00 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.customer.c_custkey' of SELECT #4 was resolved in SELECT #2 Note 1003 select substr(`dbt3_s001`.`customer`.`c_phone`,1,2) AS `cntrycode`,count(0) AS `numcust`,sum(`dbt3_s001`.`customer`.`c_acctbal`) AS `totacctbal` from `dbt3_s001`.`customer` where ((substr(`dbt3_s001`.`customer`.`c_phone`,1,2) in ('10','20','14','19','11','28','25')) and (`dbt3_s001`.`customer`.`c_acctbal` > (select avg(`dbt3_s001`.`customer`.`c_acctbal`) from `dbt3_s001`.`customer` where ((`dbt3_s001`.`customer`.`c_acctbal` > 0.00) and (substr(`dbt3_s001`.`customer`.`c_phone`,1,2) in ('10','20','14','19','11','28','25'))))) and (not((1,exists(select 1 from `dbt3_s001`.`orders` where (`dbt3_s001`.`orders`.`o_custkey` = `dbt3_s001`.`customer`.`c_custkey`)))))) group by substr(`dbt3_s001`.`customer`.`c_phone`,1,2) order by substr(`dbt3_s001`.`customer`.`c_phone`,1,2) select cntrycode, count(*) as numcust, sum(c_acctbal) as totacctbal from ( select substr(c_phone, 1, 2) as cntrycode, c_acctbal from customer where substr(c_phone, 1, 2) in ('10', '20', '14', '19', '11', '28', '25') and c_acctbal > (select avg(c_acctbal) from customer where c_acctbal > 0.00 and substr(c_phone, 1, 2) in ('10', '20', '14', '19', '11', '28', '25')) and not exists (select * from orders where o_custkey = c_custkey) ) as vip group by cntrycode order by cntrycode; cntrycode numcust totacctbal 11 4 29942.58 19 2 17120.35 20 1 9091.82 28 2 14755.5 set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED select cntrycode, count(*) as numcust, sum(c_acctbal) as totacctbal from ( select substr(c_phone, 1, 2) as cntrycode, c_acctbal from customer where substr(c_phone, 1, 2) in ('10', '20', '14', '19', '11', '28', '25') and c_acctbal > (select avg(c_acctbal) from customer where c_acctbal > 0.00 and substr(c_phone, 1, 2) in ('10', '20', '14', '19', '11', '28', '25')) and not exists (select * from orders where o_custkey = c_custkey) ) as vip group by cntrycode order by cntrycode; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY customer ALL NULL NULL NULL NULL 150 100.00 Using where; Using temporary; Using filesort 4 DEPENDENT SUBQUERY orders ref i_o_custkey i_o_custkey 5 dbt3_s001.customer.c_custkey 15 100.00 Using index 3 SUBQUERY customer ALL NULL NULL NULL NULL 150 91.00 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.customer.c_custkey' of SELECT #4 was resolved in SELECT #2 Note 1003 select substr(`dbt3_s001`.`customer`.`c_phone`,1,2) AS `cntrycode`,count(0) AS `numcust`,sum(`dbt3_s001`.`customer`.`c_acctbal`) AS `totacctbal` from `dbt3_s001`.`customer` where ((substr(`dbt3_s001`.`customer`.`c_phone`,1,2) in ('10','20','14','19','11','28','25')) and (`dbt3_s001`.`customer`.`c_acctbal` > (select avg(`dbt3_s001`.`customer`.`c_acctbal`) from `dbt3_s001`.`customer` where ((`dbt3_s001`.`customer`.`c_acctbal` > 0.00) and (substr(`dbt3_s001`.`customer`.`c_phone`,1,2) in ('10','20','14','19','11','28','25'))))) and (not((1,exists(select 1 from `dbt3_s001`.`orders` where (`dbt3_s001`.`orders`.`o_custkey` = `dbt3_s001`.`customer`.`c_custkey`)))))) group by substr(`dbt3_s001`.`customer`.`c_phone`,1,2) order by substr(`dbt3_s001`.`customer`.`c_phone`,1,2) select cntrycode, count(*) as numcust, sum(c_acctbal) as totacctbal from ( select substr(c_phone, 1, 2) as cntrycode, c_acctbal from customer where substr(c_phone, 1, 2) in ('10', '20', '14', '19', '11', '28', '25') and c_acctbal > (select avg(c_acctbal) from customer where c_acctbal > 0.00 and substr(c_phone, 1, 2) in ('10', '20', '14', '19', '11', '28', '25')) and not exists (select * from orders where o_custkey = c_custkey) ) as vip group by cntrycode order by cntrycode; cntrycode numcust totacctbal 11 4 29942.58 19 2 17120.35 20 1 9091.82 28 2 14755.5 === Q20 === set optimizer_use_condition_selectivity=1; EXPLAIN EXTENDED select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY supplier ALL PRIMARY,i_s_nationkey NULL NULL NULL 10 100.00 Using where; Using filesort 1 PRIMARY eq_ref distinct_key distinct_key 4 func 1 100.00 1 PRIMARY nation eq_ref PRIMARY PRIMARY 4 dbt3_s001.supplier.s_nationkey 1 100.00 Using where 2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 100.00 Using where 2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where 4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 100.00 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2 Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2 Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`nation`.`n_nationkey` = `dbt3_s001`.`supplier`.`s_nationkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= (cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < ((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10 select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; s_name s_address Supplier#000000010 Saygah3gYWMp72i PY SELECT ((SELECT COUNT(*) FROM part WHERE p_name LIKE 'g%') / (SELECT COUNT(*) FROM part)) AS sel; sel 0.0600 set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort 1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00 1 PRIMARY eq_ref distinct_key distinct_key 4 func 1 100.00 2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 4.17 Using where 2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where 4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2 Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2 Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= (cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < ((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10 select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; s_name s_address Supplier#000000010 Saygah3gYWMp72i PY set histogram_size=127; ANALYZE TABLE part PERSISTENT FOR COLUMNS(p_name) INDEXES(); Table Op Msg_type Msg_text dbt3_s001.part analyze status Engine-independent statistics collected dbt3_s001.part analyze status OK flush table part; set optimizer_use_condition_selectivity=4; EXPLAIN EXTENDED select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort 1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00 1 PRIMARY eq_ref distinct_key distinct_key 4 func 1 100.00 2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 7.03 Using where 2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where 4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2 Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2 Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= (cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < ((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10 select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; s_name s_address Supplier#000000010 Saygah3gYWMp72i PY set histogram_type='DOUBLE_PREC_HB'; set histogram_size=126; ANALYZE TABLE part PERSISTENT FOR COLUMNS(p_name) INDEXES(); Table Op Msg_type Msg_text dbt3_s001.part analyze status Engine-independent statistics collected dbt3_s001.part analyze status OK flush table part; EXPLAIN EXTENDED select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort 1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00 1 PRIMARY eq_ref distinct_key distinct_key 4 func 1 100.00 2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 7.81 Using where 2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where 4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2 Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2 Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= (cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < ((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10 select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; s_name s_address Supplier#000000010 Saygah3gYWMp72i PY set histogram_type='SINGLE_PREC_HB'; set histogram_size=24; ANALYZE TABLE nation PERSISTENT FOR COLUMNS(n_name) INDEXES(); Table Op Msg_type Msg_text dbt3_s001.nation analyze status Engine-independent statistics collected dbt3_s001.nation analyze status OK flush table nation; EXPLAIN EXTENDED select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort 1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00 1 PRIMARY eq_ref distinct_key distinct_key 4 func 1 100.00 2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 7.81 Using where 2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where 4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where Warnings: Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2 Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2 Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= (cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < ((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10 select sql_calc_found_rows s_name, s_address from supplier, nation where s_suppkey in (select ps_suppkey from partsupp where ps_partkey in (select p_partkey from part where p_name like 'g%') and ps_availqty > (select 0.5 * sum(l_quantity) from lineitem where l_partkey = ps_partkey and l_suppkey = ps_suppkey and l_shipdate >= date('1993-01-01') and l_shipdate < date('1993-01-01') + interval '1' year )) and s_nationkey = n_nationkey and n_name = 'UNITED STATES' order by s_name limit 10; s_name s_address Supplier#000000010 Saygah3gYWMp72i PY DROP DATABASE dbt3_s001; set histogram_type=@save_histogram_type; set histogram_size=@save_histogram_size; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; use test; # # Bug mdev-4348: using view with use_condition_selectivity > 1 # set @tmp_use_stat_tables=@@use_stat_tables; set use_stat_tables='never'; set optimizer_use_condition_selectivity=3; CREATE TABLE t1 (a int, b int); INSERT t1 VALUES (7,1), (0,7); CREATE ALGORITHM=MERGE VIEW v1 AS SELECT * FROM t1; CREATE TABLE t2 (c int, d int, index idx(d)); INSERT INTO t2 VALUES (0,4), (8,6), (1,3), (8,5), (9,3), (2,2), (6,2), (1,9), (6,3), (2,8), (4,1), (0,7), (4,8), (4,5); EXPLAIN EXTENDED SELECT * FROM v1 INNER JOIN t2 ON ( a = c AND b = d ); 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 Using where 1 SIMPLE t2 ref idx idx 5 test.t1.b 1 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`c` = `test`.`t1`.`a`) and (`test`.`t2`.`d` = `test`.`t1`.`b`)) SELECT * FROM v1 INNER JOIN t2 ON ( a = c AND b = d ); a b c d 0 7 0 7 DROP VIEW v1; DROP TABLE t1,t2; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; set use_stat_tables=@tmp_use_stat_tables; # # Bug mdev-4349: impossible range for non-indexed column # set optimizer_use_condition_selectivity=3; create table t1 (a int); insert into t1 values (3), (7), (2), (5), (7), (1), (2), (2); set optimizer_use_condition_selectivity=1; explain extended select * from t1 where a < 1 and a > 7; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 8 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` < 1) and (`test`.`t1`.`a` > 7)) select * from t1 where a < 1 and a > 7; a set optimizer_use_condition_selectivity=3; explain extended select * from t1 where a < 1 and a > 7; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where 0 select * from t1 where a < 1 and a > 7; a drop table t1; create table t1 (a int); insert into t1 values (1); create table t2 (b int); insert into t2 values (2),(3); explain extended select * from t1 where a in ( select b from t2 ) AND ( a > 3 ); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 1 0.00 Using where 1 PRIMARY eq_ref distinct_key distinct_key 4 func 1 100.00 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 0.00 Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t1`.`a` > 3)) select * from t1 where a in ( select b from t2 ) AND ( a > 3 ); a drop table t1,t2; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; # # Bug mdev-4350: erroneous negative selectivity # create table t1 (a int); insert into t1 values (1), (1); insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 select * from t1; insert into t1 values (0); select count(*) from t1; count(*) 1025 set use_stat_tables='preferably'; set histogram_size=127; set histogram_type='SINGLE_PREC_HB'; analyze table t1; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK flush table t1; set optimizer_use_condition_selectivity=4; explain extended select * from t1 where a=0; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 1025 0.39 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` = 0) drop table t1; set histogram_size=@save_histogram_size; set histogram_type=@save_histogram_type; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; # # Bug mdev-4367: 2-way join with an empty table # when optimizer_use_condition_selectivity=3 # set optimizer_use_condition_selectivity=3; CREATE TABLE t1 (a varchar(1)) ENGINE=MyISAM; INSERT INTO t1 VALUES ('j'),('k'); CREATE TABLE t2 (b varchar(1)) ENGINE=MyISAM; INSERT INTO t2 VALUES ('x'),('y'); CREATE TABLE t3 (c varchar(1), KEY(c)) ENGINE=MyISAM; SELECT * FROM t1 STRAIGHT_JOIN (t2 JOIN t3 ON c = b AND b > 'z'); a b c DROP TABLE t1,t2,t3; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; # # Bug mdev-4366: impossible condition on an indexed column discovered after # substitution of constant tables # with optimizer_use_condition_selectivity=3 # CREATE TABLE t1 (pk int PRIMARY KEY, a int); INSERT INTO t1 VALUES (1,4), (2,6), (3,3), (4,5); CREATE TABLE t2 (b int); INSERT INTO t2 VALUES (1), (7); set optimizer_use_condition_selectivity=1; EXPLAIN EXTENDED SELECT 1 FROM t1, t2 WHERE pk = 6 AND a = 2 AND b = 10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1003 select 1 AS `1` from `test`.`t1` join `test`.`t2` where 0 SELECT 1 FROM t1, t2 WHERE pk = 6 AND a = 2 AND b = 10; 1 set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED SELECT 1 FROM t1, t2 WHERE pk = 6 AND a = 2 AND b = 10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1003 select 1 AS `1` from `test`.`t1` join `test`.`t2` where 0 SELECT 1 FROM t1, t2 WHERE pk = 6 AND a = 2 AND b = 10; 1 DROP TABLE t1,t2; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; # # Bug mdev-4370: Histograms have bean created, but the query is run after # FLUSH TABLES with optimizer_use_condition_selectivity=3 # set use_stat_tables=PREFERABLY; set histogram_size=10; set histogram_type='SINGLE_PREC_HB'; CREATE TABLE t1 (a int); INSERT INTO t1 VALUES (9), (1); ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK FLUSH TABLES; set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a > 3; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 75.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` > 3) SELECT * FROM t1 WHERE a > 3; a 9 set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1; set histogram_size=@save_histogram_size; set histogram_type=@save_histogram_type; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-4371: Join with condition supported by index on an empty table # with optimizer_use_condition_selectivity=3 # set use_stat_tables=PREFERABLY; CREATE TABLE t1 (a int, b int, INDEX(a)); CREATE TABLE t2 (c int); INSERT INTO t2 VALUES (1),(2),(3),(4),(5),(6),(7),(8); ANALYZE TABLE t1, t2; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK FLUSH TABLES; set optimizer_use_condition_selectivity=3; set @save_optimizer_switch=@@optimizer_switch; set optimizer_switch='index_condition_pushdown=off'; EXPLAIN EXTENDED SELECT * FROM t1, t2 WHERE a > 9; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 range a a 5 NULL 1 0.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 8 100.00 Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where (`test`.`t1`.`a` > 9) SELECT * FROM t1, t2 WHERE a > 9; a b c set optimizer_switch=@save_optimizer_switch; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1,t2; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-4373: condition on a short varchar column # with optimizer_use_condition_selectivity=3 # set use_stat_tables=PREFERABLY; CREATE TABLE t1 (a varchar(1)); INSERT INTO t1 VALUES ('x'), ('y'); ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK FLUSH TABLES; set optimizer_use_condition_selectivity=3; SELECT * FROM t1 WHERE a <= 'w'; a set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-4372: exists subquery in WHERE # with optimizer_use_condition_selectivity=3 # set use_stat_tables = PREFERABLY; CREATE TABLE t1 (a int); INSERT INTO t1 VALUES (1),(7),(4),(7),(0),(2),(9),(4),(0),(9),(1),(3),(8),(8); CREATE TABLE t2 (b int); INSERT INTO t2 VALUES (4),(5),(2),(5),(1),(1),(2); ANALYZE TABLE t1, t2; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK FLUSH TABLES; set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED SELECT * FROM t1, t2 WHERE EXISTS ( SELECT 1 FROM t1, t2 ) AND a != b OR a <= 4; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 100.00 1 PRIMARY t1 ALL NULL NULL NULL NULL 14 100.00 Using where; Using join buffer (flat, BNL join) 2 SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 2 SUBQUERY t1 ALL NULL NULL NULL NULL 14 100.00 Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` join `test`.`t2` where ((((1,exists(select 1 from `test`.`t1` join `test`.`t2`))) and (`test`.`t1`.`a` <> `test`.`t2`.`b`)) or (`test`.`t1`.`a` <= 4)) set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1,t2; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-4363: selectivity of the condition a IS NULL OR IS NOT NULL # with optimizer_use_condition_selectivity=3 # set use_stat_tables = PREFERABLY; CREATE TABLE t1 (a int); INSERT INTO t1 VALUES (1),(7),(4),(7),(NULL),(2),(NULL),(4),(NULL),(NULL),(1),(3),(8),(8); ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK FLUSH TABLE t1; set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a IS NULL; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 14 28.57 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where isnull(`test`.`t1`.`a`) EXPLAIN EXTENDED SELECT * FROM t1 WHERE a IS NOT NULL; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 14 71.43 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` is not null) EXPLAIN EXTENDED SELECT * FROM t1 WHERE a IS NULL OR a IS NOT NULL; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 14 100.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (isnull(`test`.`t1`.`a`) or (`test`.`t1`.`a` is not null)) EXPLAIN EXTENDED SELECT * FROM t1 WHERE a IS NULL OR a < 5; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 14 69.39 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (isnull(`test`.`t1`.`a`) or (`test`.`t1`.`a` < 5)) set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-4378: 2-way join with a materialized IN subquery in WHERE # when optimizer_use_condition_selectivity=4 # set use_stat_tables=PREFERABLY; set histogram_size=50; set histogram_type=SINGLE_PREC_HB; CREATE TABLE t1 (a INT) ENGINE=MyISAM; INSERT INTO t1 VALUES (8),(9),(6); CREATE TABLE t2 (b INT) ENGINE=MyISAM; INSERT INTO t2 VALUES (8),(1),(8),(9),(24),(6),(1),(6),(2),(4); CREATE TABLE t3 (ln VARCHAR(16)) ENGINE=MyISAM; INSERT INTO t3 VALUES ('smith'),('black'),('white'),('jones'), ('brown'),('taylor'),('anderson'),('taylor'); ANALYZE TABLE t1, t2, t3; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK test.t3 analyze status Engine-independent statistics collected test.t3 analyze status OK FLUSH TABLES; set optimizer_use_condition_selectivity=4; SELECT * FROM t1, t2 WHERE 'garcia' IN ( SELECT MIN( ln ) FROM t3 WHERE ln = 'sun' ); a b set histogram_size=@save_histogram_size; set histogram_type=@save_histogram_type; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1,t2,t3; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-4380: 2-way join with a materialized IN subquery in WHERE # when optimizer_use_condition_selectivity=3 # set use_stat_tables=PREFERABLY; CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (5),(9); CREATE TABLE t2 (b VARCHAR(8)); INSERT INTO t2 VALUES ('red'),('blue'); CREATE TABLE t3 (c VARCHAR(8), d VARCHAR(8)); INSERT INTO t3 VALUES ('white','black'),('cyan','yellow'); ANALYZE TABLE t1, t2, t3; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK test.t3 analyze status Engine-independent statistics collected test.t3 analyze status OK FLUSH TABLES; set optimizer_use_condition_selectivity=3; SELECT * FROM t1, t2 WHERE ( 'orange', 'green' ) IN ( SELECT MAX(c), MAX(d) FROM t3, t2 WHERE c >= d AND b = c ); a b set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1,t2,t3; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-4389: join with degenerated range condition in WHERE # when optimizer_use_condition_selectivity=3 # set use_stat_tables=PREFERABLY; CREATE TABLE t1 (f1 VARCHAR(1)); INSERT t1 VALUES ('p'),('q'); CREATE TABLE t2 (f2 VARCHAR(1)); INSERT INTO t2 VALUES ('o'),('v'),('f'),('f'),('e'),('l'),('j'),('p'),('r'),('j'), ('j'),('u'),('i'),('r'),('x'),('a'),('x'),('s'); ANALYZE TABLE t1, t2; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK FLUSH TABLES; SET optimizer_use_condition_selectivity=3; SELECT * FROM t1, t2 AS t2a, t2 AS t2b WHERE f1 <= 'a' AND t2a.f2 = f1; f1 f2 f2 set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1,t2; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-4406: range condition for non-nullable column # when optimizer_use_condition_selectivity=3 # create table t1 (a int not null); insert into t1 values (7), (6), (4), (9), (1), (5), (2), (1), (3), (8); set use_stat_tables='preferably'; analyze table t1; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK flush table t1; set optimizer_use_condition_selectivity=3; select count(*) from t1 where a between 5 and 7; count(*) 3 explain extended select * from t1 where a between 5 and 7; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 10 25.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` between 5 and 7) alter table t1 change column a a int; analyze table t1; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK flush table t1; explain extended select * from t1 where a between 5 and 7; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 10 25.00 Using where Warnings: Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` between 5 and 7) set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; drop table t1; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-5200: impossible where with a semijoin subquery # when optimizer_use_condition_selectivity=2 # set use_stat_tables = 'preferably'; set optimizer_use_condition_selectivity = 2; CREATE TABLE t1 (i1 int) ENGINE=MyISAM; INSERT INTO t1 VALUES (0), (1); CREATE TABLE t2 (pk2 int, i2 int, c2 char(1), PRIMARY KEY(pk2)) ENGINE=MyISAM; INSERT INTO t2 VALUES (1,8,'m'), (2,9,'b'); CREATE TABLE t3 (c3 char(1), INDEX(c3)) ENGINE=MyISAM; INSERT INTO t3 VALUES ('v'), ('c'); ANALYZE TABLE t1,t2,t3; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK test.t3 analyze status Engine-independent statistics collected test.t3 analyze status OK SELECT * FROM t1 WHERE 2 IN ( SELECT pk2 FROM t2 LEFT JOIN t3 ON (c3 = c2 ) WHERE i2 = 3 ); i1 EXPLAIN EXTENDED SELECT * FROM t1 WHERE 2 IN ( SELECT pk2 FROM t2 LEFT JOIN t3 ON (c3 = c2 ) WHERE i2 = 3 ); id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables Warnings: Note 1003 select `test`.`t1`.`i1` AS `i1` from `test`.`t1` semi join (`test`.`t2` left join `test`.`t3` on((`test`.`t3`.`c3` = 'b'))) where 0 set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1,t2,t3; # # Bug mdev-5415: query over an information schema table # when optimizer_use_condition_selectivity=3 # set optimizer_use_condition_selectivity = 3; SELECT * FROM INFORMATION_SCHEMA.TRIGGERS WHERE SQL_MODE != ''; TRIGGER_CATALOG TRIGGER_SCHEMA TRIGGER_NAME EVENT_MANIPULATION EVENT_OBJECT_CATALOG EVENT_OBJECT_SCHEMA EVENT_OBJECT_TABLE ACTION_ORDER ACTION_CONDITION ACTION_STATEMENT ACTION_ORIENTATION ACTION_TIMING ACTION_REFERENCE_OLD_TABLE ACTION_REFERENCE_NEW_TABLE ACTION_REFERENCE_OLD_ROW ACTION_REFERENCE_NEW_ROW CREATED SQL_MODE DEFINER CHARACTER_SET_CLIENT COLLATION_CONNECTION DATABASE_COLLATION set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; # # Bug mdev-5630: always true conjunctive condition # when optimizer_use_condition_selectivity=3 # set use_stat_tables = 'preferably'; set optimizer_use_condition_selectivity = 3; CREATE TABLE t1 (a int) ENGINE=MyISAM; INSERT INTO t1 VALUES (10); CREATE TABLE t2 (id int, flag char(1), INDEX(id)) ENGINE=MyISAM; INSERT INTO t2 VALUES (100,'0'),(101,'1'); ANALYZE TABLE t1, t2; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK SELECT * FROM t1, t2 WHERE id = a AND ( a = 16 OR flag AND a != 6 ); a id flag DROP TABLE t1,t2; # # Bug mdev-4429: join with range condition whose selectivity == 0 # when optimizer_use_condition_selectivity=3 # CREATE TABLE language (lang_group INT, lang VARCHAR(16) PRIMARY KEY); INSERT INTO language VALUES (1,'Chinese'),(6,'English'),(1,'French'), (1,'German'),(1,'Italian'),(0,'Japanese'); CREATE TABLE country (code varchar(3) PRIMARY KEY, country_group INT DEFAULT NULL); INSERT INTO country VALUES ('USA',3),('FRA',5); CREATE TABLE continent (cont_group INT, cont varchar(16) PRIMARY KEY); INSERT INTO continent VALUES (1,'N.America'),(1,'S.America'),(3,'Australia'), (4,'Africa'),(5,'Antarctica'),(6,'Eurasia'); SET use_stat_tables=PREFERABLY; ANALYZE TABLE country, language, continent; Table Op Msg_type Msg_text test.country analyze status Engine-independent statistics collected test.country analyze status OK test.language analyze status Engine-independent statistics collected test.language analyze status OK test.continent analyze status Engine-independent statistics collected test.continent analyze status OK FLUSH TABLES; SET optimizer_use_condition_selectivity=3; SELECT * FROM language, country, continent WHERE country_group = lang_group AND lang_group IS NULL; lang_group lang code country_group cont_group cont EXPLAIN EXTENDED SELECT * FROM language, country, continent WHERE country_group = lang_group AND lang_group IS NULL; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE country ALL NULL NULL NULL NULL 2 0.00 Using where 1 SIMPLE language ALL NULL NULL NULL NULL 6 0.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE continent ALL NULL NULL NULL NULL 6 100.00 Using join buffer (incremental, BNL join) Warnings: Note 1003 select `test`.`language`.`lang_group` AS `lang_group`,`test`.`language`.`lang` AS `lang`,`test`.`country`.`code` AS `code`,`test`.`country`.`country_group` AS `country_group`,`test`.`continent`.`cont_group` AS `cont_group`,`test`.`continent`.`cont` AS `cont` from `test`.`language` join `test`.`country` join `test`.`continent` where ((`test`.`language`.`lang_group` = `test`.`country`.`country_group`) and isnull(`test`.`country`.`country_group`)) set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; drop table language, country, continent; set use_stat_tables=@save_use_stat_tables; # # Bug mdev-5191: performance degradation due to a suboptimal chosen plan # when optimizer_use_condition_selectivity=3 # set use_stat_tables = 'preferably'; set @@RAND_SEED1=810763568, @@RAND_SEED2=600681772; set TIMESTAMP=1394806993; create table t1 (a int, b int) engine=myisam; insert t1 values (rand()*1e5, rand()*1e5); insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; insert t1 select rand()*1e5, rand()*1e5 from t1; create table t2 (c int, d int, key(c), key(d)) engine=myisam; insert t2 select floor(rand()*1e5/2)*2, floor(rand()*1e5/3)*3 from t1; analyze table t1,t2; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status Table is already up to date set optimizer_use_condition_selectivity=1; explain extended select * from t1, t2, t1 as t3 where t1.b=t2.c and t2.d=t3.a and t3.b<5 and t1.a < 2000; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 262144 100.00 Using where 1 SIMPLE t2 ref c,d c 5 test.t1.b 5 100.00 1 SIMPLE t3 ALL NULL NULL NULL NULL 262144 100.00 Using where; Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t1` `t3` where ((`test`.`t2`.`c` = `test`.`t1`.`b`) and (`test`.`t3`.`a` = `test`.`t2`.`d`) and (`test`.`t3`.`b` < 5) and (`test`.`t1`.`a` < 2000)) select * from t1, t2, t1 as t3 where t1.b=t2.c and t2.d=t3.a and t3.b<5 and t1.a < 2000; a b c d a b 1063 89366 89366 28296 28296 3 1495 89366 89366 28296 28296 3 221 56120 56120 28296 28296 3 961 24512 24512 85239 85239 4 set optimizer_use_condition_selectivity=3; explain extended select * from t1, t2, t1 as t3 where t1.b=t2.c and t2.d=t3.a and t3.b<5 and t1.a < 2000; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t3 ALL NULL NULL NULL NULL 262144 0.00 Using where 1 SIMPLE t2 ref c,d d 5 test.t3.a 7 100.00 1 SIMPLE t1 ALL NULL NULL NULL NULL 262144 2.00 Using where; Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t1` `t3` where ((`test`.`t1`.`b` = `test`.`t2`.`c`) and (`test`.`t2`.`d` = `test`.`t3`.`a`) and (`test`.`t3`.`b` < 5) and (`test`.`t1`.`a` < 2000)) select * from t1, t2, t1 as t3 where t1.b=t2.c and t2.d=t3.a and t3.b<5 and t1.a < 2000; a b c d a b 1063 89366 89366 28296 28296 3 1495 89366 89366 28296 28296 3 221 56120 56120 28296 28296 3 961 24512 24512 85239 85239 4 set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; drop table t1,t2; set histogram_type=@save_histogram_type; set histogram_size=@save_histogram_size; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; # # Bug mdev-5931: no where condition after constant table row substitution # with optimizer_use_condition_selectivity=3 # CREATE TABLE t1 (a varchar(3), b varchar(3)) ENGINE=MyISAM; INSERT INTO t1 VALUES ('foo', 'foo'); CREATE TABLE t2 (c INT) ENGINE=MyISAM; INSERT INTO t2 VALUES (1), (2); set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED SELECT * FROM t1, t2 WHERE c >= 0 OR a = b ; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Warnings: Note 1003 select 'foo' AS `a`,'foo' AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` where 1 SELECT * FROM t1, t2 WHERE c >= 0 OR a = b ; a b c foo foo 1 foo foo 2 set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1,t2; # # Bug mdev-6325: wrong selectivity of a column with ref access # create table t0(a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1(a int); insert into t1 select A.a + B.a* 10 + C.a * 100 from t0 A, t0 B, t0 C; create table t2 (a int, b int, key(a)); insert into t2 select A.a + 10*B.a, 12345 from t0 A, t0 B, t0 C; set use_stat_tables='preferably'; set histogram_size=100; set optimizer_use_condition_selectivity=4; analyze table t1 persistent for all; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK analyze table t2 persistent for all; Table Op Msg_type Msg_text test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK explain extended select * from t1 straight_join t2 where t1.a=t2.a and t1.a<10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 1000 0.99 Using where 1 SIMPLE t2 ref a a 5 test.t1.a 10 100.00 Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`a`) and (`test`.`t1`.`a` < 10)) explain extended select * from t1 straight_join t2 where t1.a=t2.a and t2.a<10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 1000 0.99 Using where 1 SIMPLE t2 ref a a 5 test.t1.a 10 100.00 Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` straight_join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`a`) and (`test`.`t1`.`a` < 10)) set histogram_size=@save_histogram_size; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; drop table t0,t1,t2; # # Bug mdev-6843: col IS NULL in where condition when col is always NULL # create table t0(a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1(a int); insert into t1 select A.a + B.a* 10 + C.a * 100 from t0 A, t0 B, t0 C; create table t2 (a int, b int); insert into t2 select NULL, a from t1; set use_stat_tables='preferably'; set histogram_size=100; set optimizer_use_condition_selectivity=4; analyze table t2 persistent for all; Table Op Msg_type Msg_text test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK explain extended select * from t2 a straight_join t2 b where a.a is null; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE a ALL NULL NULL NULL NULL 1000 100.00 Using where 1 SIMPLE b ALL NULL NULL NULL NULL 1000 100.00 Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`a`.`a` AS `a`,`test`.`a`.`b` AS `b`,`test`.`b`.`a` AS `a`,`test`.`b`.`b` AS `b` from `test`.`t2` `a` straight_join `test`.`t2` `b` where isnull(`test`.`a`.`a`) set histogram_size=@save_histogram_size; set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; drop table t0,t1,t2; # # Bug mdev-7316: a conjunct in WHERE with selectivity == 0 # CREATE TABLE t1 (a varchar(16), b int, PRIMARY KEY(a), KEY(b)); INSERT INTO t1 VALUES ('USAChinese',10), ('USAEnglish',20), ('USAFrench',30); CREATE TABLE t2 (i int); INSERT INTO t2 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(1),(2),(3),(4); ANALYZE TABLE t1, t2; Table Op Msg_type Msg_text test.t1 analyze status Engine-independent statistics collected test.t1 analyze status OK test.t2 analyze status Engine-independent statistics collected test.t2 analyze status OK set use_stat_tables='preferably'; set optimizer_use_condition_selectivity=3; EXPLAIN EXTENDED SELECT * FROM t1, t2 WHERE a <> 'USARussian' AND b IS NULL; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ref PRIMARY,b b 5 const 2 66.67 Using where; Using index 1 SIMPLE t2 ALL NULL NULL NULL NULL 14 100.00 Using join buffer (flat, BNL join) Warnings: Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`i` AS `i` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`a` <> 'USARussian') and isnull(`test`.`t1`.`b`)) SELECT * FROM t1, t2 WHERE a <> 'USARussian' AND b IS NULL; a b i set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity; DROP TABLE t1,t2; set use_stat_tables=@save_use_stat_tables; set optimizer_switch=@save_optimizer_switch_for_selectivity_test; set @tmp_ust= @@use_stat_tables; set @tmp_oucs= @@optimizer_use_condition_selectivity; # # MDEV-6808: MariaDB 10.0.13 crash with optimizer_use_condition_selectivity > 1 # set @tmp_mdev6808= @@optimizer_use_condition_selectivity; SET optimizer_use_condition_selectivity = 2; CREATE TABLE t1 ( event_id int(11) unsigned NOT NULL AUTO_INCREMENT, PRIMARY KEY (event_id) ) ENGINE=InnoDB; CREATE TABLE t2 ( repost_id int(11) unsigned NOT NULL AUTO_INCREMENT, subject_type varchar(24) CHARACTER SET latin1 COLLATE latin1_general_ci NOT NULL, subject_id int(11) unsigned NOT NULL, object_type varchar(24) CHARACTER SET latin1 COLLATE latin1_general_ci NOT NULL, object_id int(11) unsigned NOT NULL, is_private int(1) NOT NULL DEFAULT '0', PRIMARY KEY (repost_id), UNIQUE KEY `BETWEEN` (subject_type,subject_id,object_type,object_id,is_private), KEY SUBJECT (subject_type,subject_id), KEY OBJECT (object_type,object_id) ) ENGINE=InnoDB; SELECT * FROM t2, t1 WHERE t2.object_type = 'event' AND t2.object_id = t1.event_id AND t2.is_private = 0 AND t2.subject_id = 127994 AND t2.subject_type in ('user') ; repost_id subject_type subject_id object_type object_id is_private event_id DROP TABLE t1, t2; set optimizer_use_condition_selectivity=@tmp_mdev6808; # # MDEV-6442: Assertion `join->best_read < double(...)' failed with optimizer_use_condition_selectivity >=3, ... # SET use_stat_tables = PREFERABLY; SET optimizer_use_condition_selectivity = 3; CREATE TABLE t1 ( a VARCHAR(3), b VARCHAR(8), KEY (a,b) ) ENGINE=InnoDB; INSERT INTO t1 VALUES ('USA','Chinese'),('USA','English'); CREATE TABLE t2 (i INT) ENGINE=InnoDB; SELECT * FROM t1, t2 WHERE ( 't', 'o' ) IN ( SELECT t1_2.b, t1_1.a FROM t1 AS t1_1 STRAIGHT_JOIN t1 AS t1_2 ON ( t1_2.a = t1_1.b ) ); a b i DROP TABLE t1,t2; # # MDEV-6738: use_stat_table + histograms crashing optimizer # set use_stat_tables='preferably'; set optimizer_use_condition_selectivity=4; # Need innodb because there is a special kind of field_bit for non-myisam tables create table t1(col1 int, col2 bit(1) DEFAULT NULL) engine=innodb; select * from t1 where col2 != true; col1 col2 drop table t1; # # MDEV-7413: optimizer_use_condition_selectivity > 2 crashes 10.0.15+maria-1~wheezy # CREATE TABLE t1 ( parent_id int, child_group_id int, child_user_id int, KEY (parent_id,child_group_id,child_user_id) ) ENGINE=InnoDB; CREATE TABLE t2 ( id int, lower_group_name varchar(255), directory_id int(20), UNIQUE KEY (directory_id) ) ENGINE=InnoDB; CREATE TABLE t3 (id int) ENGINE=InnoDB; insert into t1 values (1,1,1),(2,2,2); insert into t2 values (10,'foo',10),(20,'bar',20); insert into t3 values (101),(102); set use_stat_tables = PREFERABLY, optimizer_use_condition_selectivity = 3; select * from t1, t2, t3 where t1.child_user_id=t3.id and t1.child_group_id is null and t2.lower_group_name='foo' and t1.parent_id=t2.id and t2.directory_id=10; parent_id child_group_id child_user_id id lower_group_name directory_id id drop table t1,t2,t3; # # End of 10.0 tests # set use_stat_tables= @tmp_ust; set optimizer_use_condition_selectivity= @tmp_oucs; SET SESSION STORAGE_ENGINE=DEFAULT;