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MDEV-4778: Incorrect results from Aria/MyISAM SELECT using index with prefix length on TEXT column

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Backport the fix olav.sandstaa@sun.com-20101102184747-qfuntqwj021imy9r:
"Fix for Bug#52660 Perf. regr. using ICP for MyISAM on range queries on an index containing TEXT" 
(together with further fixes in that code) into MyISAM and Aria.
This commit is contained in:
Sergey Petrunya
2013-07-16 10:56:42 +04:00
parent 9651a6f574
commit 47c1b04079
10 changed files with 180 additions and 14 deletions
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20
mysql-test/r/null_key.result
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@ -78,13 +78,13 @@ 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));
explain select * from t1 where a is null and b = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 Using index condition; Using where
1 SIMPLE t1 ref a,b a 5 const 3 Using where
explain select * from t1 where a is null and b = 2 and c=0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 Using index condition; Using where
1 SIMPLE t1 ref a,b a 5 const 3 Using where
explain select * from t1 where a is null and b = 7 and c=0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 Using index condition; Using where
1 SIMPLE t1 ref a,b a 5 const 3 Using where
explain select * from t1 where a=2 and b = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 1 Using where
@ -93,25 +93,25 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 12 Using where
explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 and c=0 limit 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 5 NULL 5 Using index condition; Using where
1 SIMPLE t1 range a,b a 5 NULL 5 Using where
explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref_or_null a,b a 5 const 4 Using index condition; Using where
1 SIMPLE t1 ref_or_null a,b a 5 const 4 Using where
explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 Using index condition; Using where
1 SIMPLE t1 ref a,b a 5 const 3 Using where
explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 Using index condition; Using where
1 SIMPLE t1 ref a,b a 5 const 3 Using where
explain select * from t1 where a > 1 and a < 3 limit 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 1 Using index condition
1 SIMPLE t1 range a a 5 NULL 1 Using where
explain select * from t1 where a is null and b=7 or a > 1 and a < 3 limit 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 5 NULL 4 Using index condition; Using where
1 SIMPLE t1 range a,b a 5 NULL 4 Using where
explain select * from t1 where a > 8 and a < 9;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 1 Using index condition
1 SIMPLE t1 range a a 5 NULL 1 Using where
explain select * from t1 where b like "6%";
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range b b 12 NULL 1 Using where