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Merge bk-internal:/home/bk/mysql-4.0/

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into serg.mylan:/usr/home/serg/Abk/mysql-4.0
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serg@serg.mylan 2004-08-01 13:30:10 +02:00
commit fab9fcb071
3 changed files with 21 additions and 0 deletions
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2
myisam/mi_key.c
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@ -177,6 +177,8 @@ uint _mi_pack_key(register MI_INFO *info, uint keynr, uchar *key, uchar *old,
if (!(*key++= (char) 1-*old++)) /* Copy null marker */
{
k_length-=length;
if (keyseg->flag & (HA_VAR_LENGTH | HA_BLOB_PART))
k_length-=2; /* Skip length */
continue; /* Found NULL */
}
}

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;

10
mysql-test/t/myisam.test
View File

@ -436,3 +436,13 @@ select sql_big_result distinct t1.a from t1,t2;
explain select sql_big_result distinct t1.a from t1,t2 order by t2.a;
explain select distinct t1.a from t1,t2 order by t2.a;
drop table t1,t2;
#
# index search for NULL in blob. Bug #4816
#
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;
select count(*) from t1 where a is null;
drop table t1;