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bug#4816. index search for NULL in blob

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2004-08-01 13:26:01 +02:00
parent 9ca47d047e
commit d14a27fdad
3 changed files with 21 additions and 0 deletions
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9
mysql-test/r/myisam.result
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@ -453,3 +453,12 @@ table type possible_keys key key_len ref rows Extra
t1 system NULL NULL NULL NULL 1 Using temporary
t2 index NULL PRIMARY 4 NULL 2 Using index; Distinct
drop table t1,t2;
create table t1 ( a tinytext, b char(1), index idx (a(1),b) );
insert into t1 values (null,''), (null,'');
explain select count(*) from t1 where a is null;
table type possible_keys key key_len ref rows Extra
t1 ref idx idx 4 const 1 Using where
select count(*) from t1 where a is null;
count(*)
2
drop table t1;