diff options
Diffstat (limited to 'mysql-test/main/myisam_mrr.result')
| -rw-r--r-- | mysql-test/main/myisam_mrr.result | 639 |
1 files changed, 639 insertions, 0 deletions
diff --git a/mysql-test/main/myisam_mrr.result b/mysql-test/main/myisam_mrr.result new file mode 100644 index 00000000000..511e6a8d01f --- /dev/null +++ b/mysql-test/main/myisam_mrr.result @@ -0,0 +1,639 @@ +drop table if exists t0, t1, t2, t3; +set @myisam_mrr_tmp=@@optimizer_switch; +set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on'; +set @mrr_buffer_size_save= @@mrr_buffer_size; +set mrr_buffer_size=79; +Warnings: +Warning 1292 Truncated incorrect mrr_buffer_size value: '79' +create table t1(a int); +show create table t1; +Table Create Table +t1 CREATE TABLE `t1` ( + `a` int(11) DEFAULT NULL +) ENGINE=MyISAM DEFAULT CHARSET=latin1 +insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t2(a int); +insert into t2 select A.a + 10*(B.a + 10*C.a) from t1 A, t1 B, t1 C; +create table t3 ( +a char(8) not null, b char(8) not null, filler char(200), +key(a) +); +insert into t3 select @a:=concat('c-', 1000+ A.a, '=w'), @a, 'filler' from t2 A; +insert into t3 select concat('c-', 1000+A.a, '=w'), concat('c-', 2000+A.a, '=w'), +'filler-1' from t2 A; +insert into t3 select concat('c-', 1000+A.a, '=w'), concat('c-', 3000+A.a, '=w'), +'filler-2' from t2 A; +select a,filler from t3 where a >= 'c-9011=w'; +a filler +select a,filler from t3 where a >= 'c-1011=w' and a <= 'c-1015=w'; +a filler +c-1011=w filler +c-1012=w filler +c-1013=w filler +c-1014=w filler +c-1015=w filler +c-1011=w filler-1 +c-1012=w filler-1 +c-1013=w filler-1 +c-1014=w filler-1 +c-1015=w filler-1 +c-1011=w filler-2 +c-1012=w filler-2 +c-1013=w filler-2 +c-1014=w filler-2 +c-1015=w filler-2 +select a,filler from t3 where (a>='c-1011=w' and a <= 'c-1013=w') or +(a>='c-1014=w' and a <= 'c-1015=w'); +a filler +c-1011=w filler +c-1012=w filler +c-1013=w filler +c-1014=w filler +c-1015=w filler +c-1011=w filler-1 +c-1012=w filler-1 +c-1013=w filler-1 +c-1014=w filler-1 +c-1015=w filler-1 +c-1011=w filler-2 +c-1012=w filler-2 +c-1013=w filler-2 +c-1014=w filler-2 +c-1015=w filler-2 +insert into t3 values ('c-1013=z', 'c-1013=z', 'err'); +insert into t3 values ('a-1014=w', 'a-1014=w', 'err'); +select a,filler from t3 where (a>='c-1011=w' and a <= 'c-1013=w') or +(a>='c-1014=w' and a <= 'c-1015=w'); +a filler +c-1011=w filler +c-1012=w filler +c-1013=w filler +c-1014=w filler +c-1015=w filler +c-1011=w filler-1 +c-1012=w filler-1 +c-1013=w filler-1 +c-1014=w filler-1 +c-1015=w filler-1 +c-1011=w filler-2 +c-1012=w filler-2 +c-1013=w filler-2 +c-1014=w filler-2 +c-1015=w filler-2 +delete from t3 where b in ('c-1013=z', 'a-1014=w'); +select a,filler from t3 where a='c-1011=w' or a='c-1012=w' or a='c-1013=w' or +a='c-1014=w' or a='c-1015=w'; +a filler +c-1011=w filler +c-1012=w filler +c-1013=w filler +c-1014=w filler +c-1015=w filler +c-1011=w filler-1 +c-1012=w filler-1 +c-1013=w filler-1 +c-1014=w filler-1 +c-1015=w filler-1 +c-1011=w filler-2 +c-1012=w filler-2 +c-1013=w filler-2 +c-1014=w filler-2 +c-1015=w filler-2 +insert into t3 values ('c-1013=w', 'del-me', 'inserted'); +select a,filler from t3 where a='c-1011=w' or a='c-1012=w' or a='c-1013=w' or +a='c-1014=w' or a='c-1015=w'; +a filler +c-1011=w filler +c-1012=w filler +c-1013=w filler +c-1014=w filler +c-1015=w filler +c-1011=w filler-1 +c-1012=w filler-1 +c-1013=w filler-1 +c-1014=w filler-1 +c-1015=w filler-1 +c-1011=w filler-2 +c-1012=w filler-2 +c-1013=w filler-2 +c-1014=w filler-2 +c-1015=w filler-2 +c-1013=w inserted +delete from t3 where b='del-me'; +alter table t3 add primary key(b); +select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1018=w') or +b IN ('c-1019=w', 'c-1020=w', 'c-1021=w', +'c-1022=w', 'c-1023=w', 'c-1024=w'); +b filler +c-1011=w filler +c-1012=w filler +c-1013=w filler +c-1014=w filler +c-1015=w filler +c-1016=w filler +c-1017=w filler +c-1018=w filler +c-1019=w filler +c-1020=w filler +c-1021=w filler +c-1022=w filler +c-1023=w filler +c-1024=w filler +select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1020=w') or +b IN ('c-1021=w', 'c-1022=w', 'c-1023=w'); +b filler +c-1011=w filler +c-1012=w filler +c-1013=w filler +c-1014=w filler +c-1015=w filler +c-1016=w filler +c-1017=w filler +c-1018=w filler +c-1019=w filler +c-1020=w filler +c-1021=w filler +c-1022=w filler +c-1023=w filler +select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1018=w') or +b IN ('c-1019=w', 'c-1020=w') or +(b>='c-1021=w' and b<= 'c-1023=w'); +b filler +c-1011=w filler +c-1012=w filler +c-1013=w filler +c-1014=w filler +c-1015=w filler +c-1016=w filler +c-1017=w filler +c-1018=w filler +c-1019=w filler +c-1020=w filler +c-1021=w filler +c-1022=w filler +c-1023=w filler +drop table if exists t4; +create table t4 (a varchar(10), b int, c char(10), filler char(200), +key idx1 (a, b, c)); +insert into t4 (filler) select concat('NULL-', 15-a) from t2 order by a limit 15; +insert into t4 (a,b,c,filler) +select 'b-1',NULL,'c-1', concat('NULL-', 15-a) from t2 order by a limit 15; +insert into t4 (a,b,c,filler) +select 'b-1',NULL,'c-222', concat('NULL-', 15-a) from t2 order by a limit 15; +insert into t4 (a,b,c,filler) +select 'bb-1',NULL,'cc-2', concat('NULL-', 15-a) from t2 order by a limit 15; +insert into t4 (a,b,c,filler) +select 'zz-1',NULL,'cc-2', 'filler-data' from t2 order by a limit 500; +explain +select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1' + or c='no-such-row2'); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t4 range idx1 idx1 29 NULL 10 Using index condition; Using where; Rowid-ordered scan +select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1' + or c='no-such-row2'); +a b c filler +NULL NULL NULL NULL-15 +NULL NULL NULL NULL-14 +NULL NULL NULL NULL-13 +NULL NULL NULL NULL-12 +NULL NULL NULL NULL-11 +NULL NULL NULL NULL-10 +NULL NULL NULL NULL-9 +NULL NULL NULL NULL-8 +NULL NULL NULL NULL-7 +NULL NULL NULL NULL-6 +NULL NULL NULL NULL-5 +NULL NULL NULL NULL-4 +NULL NULL NULL NULL-3 +NULL NULL NULL NULL-2 +NULL NULL NULL NULL-1 +explain +select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2'); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t4 range idx1 idx1 29 NULL 21 Using index condition; Using where; Rowid-ordered scan +select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2'); +a b c filler +b-1 NULL c-1 NULL-15 +b-1 NULL c-1 NULL-14 +b-1 NULL c-1 NULL-13 +b-1 NULL c-1 NULL-12 +b-1 NULL c-1 NULL-11 +b-1 NULL c-1 NULL-10 +b-1 NULL c-1 NULL-9 +b-1 NULL c-1 NULL-8 +b-1 NULL c-1 NULL-7 +b-1 NULL c-1 NULL-6 +b-1 NULL c-1 NULL-5 +b-1 NULL c-1 NULL-4 +b-1 NULL c-1 NULL-3 +b-1 NULL c-1 NULL-2 +b-1 NULL c-1 NULL-1 +bb-1 NULL cc-2 NULL-15 +bb-1 NULL cc-2 NULL-14 +bb-1 NULL cc-2 NULL-13 +bb-1 NULL cc-2 NULL-12 +bb-1 NULL cc-2 NULL-11 +bb-1 NULL cc-2 NULL-10 +bb-1 NULL cc-2 NULL-9 +bb-1 NULL cc-2 NULL-8 +bb-1 NULL cc-2 NULL-7 +bb-1 NULL cc-2 NULL-6 +bb-1 NULL cc-2 NULL-5 +bb-1 NULL cc-2 NULL-4 +bb-1 NULL cc-2 NULL-3 +bb-1 NULL cc-2 NULL-2 +bb-1 NULL cc-2 NULL-1 +select * from t4 ignore index(idx1) where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2'); +a b c filler +b-1 NULL c-1 NULL-15 +b-1 NULL c-1 NULL-14 +b-1 NULL c-1 NULL-13 +b-1 NULL c-1 NULL-12 +b-1 NULL c-1 NULL-11 +b-1 NULL c-1 NULL-10 +b-1 NULL c-1 NULL-9 +b-1 NULL c-1 NULL-8 +b-1 NULL c-1 NULL-7 +b-1 NULL c-1 NULL-6 +b-1 NULL c-1 NULL-5 +b-1 NULL c-1 NULL-4 +b-1 NULL c-1 NULL-3 +b-1 NULL c-1 NULL-2 +b-1 NULL c-1 NULL-1 +bb-1 NULL cc-2 NULL-15 +bb-1 NULL cc-2 NULL-14 +bb-1 NULL cc-2 NULL-13 +bb-1 NULL cc-2 NULL-12 +bb-1 NULL cc-2 NULL-11 +bb-1 NULL cc-2 NULL-10 +bb-1 NULL cc-2 NULL-9 +bb-1 NULL cc-2 NULL-8 +bb-1 NULL cc-2 NULL-7 +bb-1 NULL cc-2 NULL-6 +bb-1 NULL cc-2 NULL-5 +bb-1 NULL cc-2 NULL-4 +bb-1 NULL cc-2 NULL-3 +bb-1 NULL cc-2 NULL-2 +bb-1 NULL cc-2 NULL-1 +drop table t1, t2, t3, t4; +create table t1 (a int, b int not null,unique key (a,b),index(b)); +insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6); +Warnings: +Warning 1062 Duplicate entry '6-6' for key 'a' +create table t2 like t1; +insert into t2 select * from t1; +alter table t1 modify b blob not null, add c int not null, drop key a, add unique key (a,b(20),c), drop key b, add key (b(10)); +select * from t1 where a is null; +a b c +NULL 7 0 +NULL 9 0 +NULL 9 0 +select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3; +a b c +NULL 9 0 +NULL 9 0 +select * from t1 where a is null and b=9 or a is null and b=7 limit 3; +a b c +NULL 7 0 +NULL 9 0 +NULL 9 0 +drop table t1, t2; +set @@mrr_buffer_size= @mrr_buffer_size_save; +CREATE TABLE t1 ( +ID int(10) unsigned NOT NULL AUTO_INCREMENT, +col1 int(10) unsigned DEFAULT NULL, +key1 int(10) unsigned NOT NULL DEFAULT '0', +key2 int(10) unsigned DEFAULT NULL, +text1 text, +text2 text, +col2 smallint(6) DEFAULT '100', +col3 enum('headers','bodyandsubject') NOT NULL DEFAULT 'bodyandsubject', +col4 tinyint(3) unsigned NOT NULL DEFAULT '0', +PRIMARY KEY (ID), +KEY (key1), +KEY (key2) +) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=utf8; +INSERT INTO t1 VALUES +(1,NULL,1130,NULL,'Hello',NULL,100,'bodyandsubject',0), +(2,NULL,1130,NULL,'bye',NULL,100,'bodyandsubject',0), +(3,NULL,1130,NULL,'red',NULL,100,'bodyandsubject',0), +(4,NULL,1130,NULL,'yellow',NULL,100,'bodyandsubject',0), +(5,NULL,1130,NULL,'blue',NULL,100,'bodyandsubject',0); +select * FROM t1 WHERE key1=1130 AND col1 IS NULL ORDER BY text1; +ID col1 key1 key2 text1 text2 col2 col3 col4 +5 NULL 1130 NULL blue NULL 100 bodyandsubject 0 +2 NULL 1130 NULL bye NULL 100 bodyandsubject 0 +1 NULL 1130 NULL Hello NULL 100 bodyandsubject 0 +3 NULL 1130 NULL red NULL 100 bodyandsubject 0 +4 NULL 1130 NULL yellow NULL 100 bodyandsubject 0 +drop table t1; + +BUG#37851: Crash in test_if_skip_sort_order tab->select is zero + +CREATE TABLE t1 ( +pk int(11) NOT NULL AUTO_INCREMENT, +PRIMARY KEY (pk) +); +INSERT INTO t1 VALUES (1); +CREATE TABLE t2 ( +pk int(11) NOT NULL AUTO_INCREMENT, +int_key int(11) DEFAULT NULL, +PRIMARY KEY (pk), +KEY int_key (int_key) +); +INSERT INTO t2 VALUES (1,1),(2,6),(3,0); +EXPLAIN EXTENDED +SELECT MIN(t1.pk) +FROM t1 WHERE EXISTS ( +SELECT t2.pk +FROM t2 +WHERE t2.int_key IS NULL +GROUP BY t2.pk +); +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 +2 SUBQUERY t2 ref int_key int_key 5 const 1 100.00 Using index condition +Warnings: +Note 1003 /* select#1 */ select min(`test`.`t1`.`pk`) AS `MIN(t1.pk)` from `test`.`t1` where 0 +DROP TABLE t1, t2; +# +# BUG#42048 Discrepancy between MyISAM and Maria's ICP implementation +# +create table t0 (a int); +insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t1 (a int, b char(20), filler char(200), key(a,b(10))); +insert into t1 select A.a + 10*(B.a + 10*C.a), 'bbb','filler' from t0 A, t0 B, t0 C; +update t1 set b=repeat(char(65+a), 20) where a < 25; +This must show range + using index condition: +explain select * from t1 where a < 10 and b = repeat(char(65+a), 20); +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a a 5 NULL 19 Using index condition; Using where +select * from t1 where a < 10 and b = repeat(char(65+a), 20); +a b filler +0 AAAAAAAAAAAAAAAAAAAA filler +1 BBBBBBBBBBBBBBBBBBBB filler +2 CCCCCCCCCCCCCCCCCCCC filler +3 DDDDDDDDDDDDDDDDDDDD filler +4 EEEEEEEEEEEEEEEEEEEE filler +5 FFFFFFFFFFFFFFFFFFFF filler +6 GGGGGGGGGGGGGGGGGGGG filler +7 HHHHHHHHHHHHHHHHHHHH filler +8 IIIIIIIIIIIIIIIIIIII filler +9 JJJJJJJJJJJJJJJJJJJJ filler +drop table t0,t1; +# +# BUG#41136: ORDER BY + range access: EXPLAIN shows "Using MRR" while MRR is actually not used +# +create table t0 (a int); +insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t1 (a int, b int, key(a)); +insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0 A, t0 B, t0 C; +This mustn't show "Using MRR": +explain select * from t1 where a < 20 order by a; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a a 5 NULL 20 Using index condition +drop table t0, t1; +# +# Part of MWL#67: DS-MRR backport: add an @@optimizer_switch flag for +# index_condition pushdown: +# - engine_condition_pushdown does not affect ICP +select @@optimizer_switch like '%index_condition_pushdown=on%'; +@@optimizer_switch like '%index_condition_pushdown=on%' +1 +create table t0 (a int); +insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t1 (a int, b int, key(a)); +insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0 A, t0 B, t0 C; +A query that will use ICP: +explain select * from t1 where a < 20; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a a 5 NULL 20 Using index condition; Rowid-ordered scan +set @save_optimizer_switch=@@optimizer_switch; +set optimizer_switch='index_condition_pushdown=off'; +explain select * from t1 where a < 20; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a a 5 NULL 20 Using where; Rowid-ordered scan +set optimizer_switch='index_condition_pushdown=on'; +explain select * from t1 where a < 20; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a a 5 NULL 20 Using index condition; Rowid-ordered scan +set optimizer_switch=@save_optimizer_switch; +# +# BUG#629684: Unreachable code in multi_range_read.cc in maria-5.3-dsmrr-cpk +# +delete from t0 where a > 2; +insert into t0 values (NULL),(NULL); +insert into t1 values (NULL, 1234), (NULL, 5678); +set @save_join_cache_level=@@join_cache_level; +set @@join_cache_level=6; +explain +select * from t0, t1 where t0.a<=>t1.a; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 ALL NULL NULL NULL NULL 5 +1 SIMPLE t1 ref a a 5 test.t0.a 1 Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan +select * from t0, t1 where t0.a<=>t1.a; +a a b +0 0 0 +1 1 1 +2 2 2 +NULL NULL 1234 +NULL NULL 1234 +NULL NULL 5678 +NULL NULL 5678 +set @@join_cache_level=@save_join_cache_level; +drop table t0, t1; +# +# BUG#625841: Assertion `!table || (!table->read_set || bitmap_is_set +# (table->read_set, field_index))' on REPLACE ... SELECT with MRR +# +create table t0 (a int); +insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t1 ( +key1 varchar(10), +col1 char(255), col2 char(255), +col3 char(244), col4 char(255), +key(key1) +); +create table t2 like t1; +insert into t1 +select +1000+A.a+100*B.a + 10*C.a, +'col1val', 'col2val', +'col3val', 'col4val' +from t0 A, t0 B, t0 C; +REPLACE INTO t2(col2,col3,col4) +SELECT col2,col3,col4 +FROM t1 +WHERE `key1` LIKE CONCAT( LEFT( '1' , 7 ) , '%' ) +ORDER BY col1 LIMIT 7; +drop table t0, t1, t2; +# +# BUG#670417: Diverging results in maria-5.3-mwl128-dsmrr-cpk with join buffer (incremental, BKA join) +# +set @save_join_cache_level = @@join_cache_level; +set join_cache_level = 6; +set @save_join_buffer_size=@@join_buffer_size; +set join_buffer_size = 136; +CREATE TABLE t1 ( +pk int(11) NOT NULL AUTO_INCREMENT, +col_int_key int(11) NOT NULL, +col_varchar_key varchar(1) NOT NULL, +col_varchar_nokey varchar(1) NOT NULL, +PRIMARY KEY (pk), +KEY col_varchar_key (col_varchar_key,col_int_key) +); +INSERT INTO t1 VALUES +(10,8,'v','v'),(11,8,'f','f'), (12,5,'v','v'), +(13,8,'s','s'),(14,8,'a','a'),(15,6,'p','p'), +(16,7,'z','z'),(17,2,'a','a'),(18,5,'h','h'), +(19,7,'h','h'),(20,2,'v','v'),(21,9,'v','v'), +(22,142,'b','b'),(23,3,'y','y'),(24,0,'v','v'), +(25,3,'m','m'),(26,5,'z','z'),(27,9,'n','n'), +(28,1,'d','d'),(29,107,'a','a'); +INSERT INTO t1 VALUES +(110,8,'v','v'),(111,8,'f','f'), (112,5,'v','v'), +(113,8,'s','s'),(114,8,'a','a'),(115,6,'p','p'), +(116,7,'z','z'),(117,2,'a','a'),(118,5,'h','h'), +(119,7,'h','h'),(120,2,'v','v'),(121,9,'v','v'), +(122,142,'b','b'),(123,3,'y','y'),(124,0,'v','v'), +(125,3,'m','m'),(126,5,'z','z'),(127,9,'n','n'), +(128,1,'d','d'),(129,107,'a','a'); +SELECT COUNT(*) +FROM +t1 AS table2, t1 AS table3 +where +table3.col_varchar_key = table2.col_varchar_key AND +table3.col_varchar_key = table2.col_varchar_nokey AND +table3.pk<>0; +COUNT(*) +200 +EXPLAIN SELECT COUNT(*) +FROM +t1 AS table2, t1 AS table3 +where +table3.col_varchar_key = table2.col_varchar_key AND +table3.col_varchar_key = table2.col_varchar_nokey AND +table3.pk<>0; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE table2 ALL col_varchar_key NULL NULL NULL 40 Using where +1 SIMPLE table3 ref PRIMARY,col_varchar_key col_varchar_key 3 test.table2.col_varchar_key 5 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan +set join_cache_level= @save_join_cache_level; +set join_buffer_size= @save_join_buffer_size; +drop table t1; +# +# BUG#730133: Wrong result with jkl = 7, BKA, ICP in maria-5.3 + compound index +# +set @tmp_730133_jcl= @@join_cache_level; +set join_cache_level = 7; +set @tmp_730133_os= @@optimizer_switch; +set optimizer_switch= 'join_cache_hashed=off,join_cache_bka=on,index_condition_pushdown=on,optimize_join_buffer_size=on'; +CREATE TABLE t1 (f1 int, f2 int, f3 int, f4 int, f5 int, KEY (f4,f3)); +INSERT IGNORE INTO t1 VALUES ('2','9','5','0','0'),('4','7','0','0','0'), +('6','97','190','0','0'),('7','3','6','0','0'),('11','101','186','0','0'), +('14','194','226','0','0'),('15','148','133','0','0'), +('16','9','6','0','0'),('17','9','3','0','0'),('18','1','8','0','0'), +('19','1','5','0','0'),('20','5','7','0','0'); +explain +SELECT COUNT(alias2.f2) +FROM +t1 STRAIGHT_JOIN +t1 AS alias3 STRAIGHT_JOIN +t1 AS alias2 FORCE KEY (f4) +WHERE +alias2.f4=alias3.f5 AND +alias2.f3 > alias3.f1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 index NULL f4 10 NULL 12 Using index +1 SIMPLE alias3 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join) +1 SIMPLE alias2 ref f4 f4 5 test.alias3.f5 2 Using index condition(BKA); Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan +SELECT COUNT(alias2.f2) +FROM +t1 STRAIGHT_JOIN +t1 AS alias3 STRAIGHT_JOIN +t1 AS alias2 FORCE KEY (f4) +WHERE +alias2.f4=alias3.f5 AND +alias2.f3 > alias3.f1; +COUNT(alias2.f2) +768 +set @@join_cache_level= @tmp_730133_jcl; +set @@optimizer_switch= @tmp_730133_os; +drop table t1; +# +# Test of MRR handler counters +# +flush status; +show status like 'Handler_mrr%'; +Variable_name Value +Handler_mrr_init 0 +Handler_mrr_key_refills 0 +Handler_mrr_rowid_refills 0 +create table t0 (a int); +insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t1 (a int, b int, filler char(200), key(a)); +insert into t1 +select A.a+10*B.a+100*C.a+1000*D.a, 123,'filler' from t0 A, t0 B, t0 C, t0 D; +explain select sum(b) from t1 where a < 10; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a a 5 NULL 8 Using index condition; Rowid-ordered scan +# This should show one MRR scan and no re-fills: +flush status; +select sum(b) from t1 where a < 10; +sum(b) +1230 +show status like 'handler_mrr%'; +Variable_name Value +Handler_mrr_init 1 +Handler_mrr_key_refills 0 +Handler_mrr_rowid_refills 0 +set @mrr_buffer_size_save= @@mrr_buffer_size; +set mrr_buffer_size=128; +explain select sum(b) from t1 where a < 1600; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range a a 5 NULL 1380 Using index condition; Rowid-ordered scan +# This should show one MRR scan and one extra rowid sort: +flush status; +select sum(b) from t1 where a < 1600; +sum(b) +196800 +show status like 'handler_mrr%'; +Variable_name Value +Handler_mrr_init 1 +Handler_mrr_key_refills 0 +Handler_mrr_rowid_refills 1 +set @@mrr_buffer_size= @mrr_buffer_size_save; +#Now, let's check BKA: +set @join_cache_level_save= @@join_cache_level; +set @join_buffer_size_save= @@join_buffer_size; +set join_cache_level=6; +explain select sum(t1.b) from t0,t1 where t0.a=t1.a; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using where +1 SIMPLE t1 ref a a 5 test.t0.a 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan +flush status; +select sum(t1.b) from t0,t1 where t0.a=t1.a; +sum(t1.b) +1230 +show status like 'handler_mrr%'; +Variable_name Value +Handler_mrr_init 1 +Handler_mrr_key_refills 0 +Handler_mrr_rowid_refills 0 +set join_buffer_size=10; +explain select sum(t1.b) from t0,t1 where t0.a=t1.a; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using where +1 SIMPLE t1 ref a a 5 test.t0.a 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan +flush status; +select sum(t1.b) from t0,t1 where t0.a=t1.a; +sum(t1.b) +1230 +show status like 'handler_mrr%'; +Variable_name Value +Handler_mrr_init ok +Handler_mrr_key_refills ok +Handler_mrr_rowid_refills ok +set join_cache_level= @join_cache_level_save; +set join_buffer_size= @join_buffer_size_save; +drop table t0, t1; +set optimizer_switch= @myisam_mrr_tmp; |