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A fix (bug #8942: SUBSTRING_INDEX in UPDATE causes internal loop).

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This commit is contained in:
ramil@mysql.com 2005-03-17 10:24:50 +04:00
parent c5478c4f25
commit a773916238
3 changed files with 18 additions and 1 deletions
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7
mysql-test/r/update.result
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@ -209,3 +209,10 @@ insert into t1 values (1, "t1c2-1", 10), (2, "t1c2-2", 20);
update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1"; update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1";
update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1" where t1.c3 = 10; update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1" where t1.c3 = 10;
drop table t1, t2; drop table t1, t2;
create table t1 (a int, b char(255), key(a, b(20)));
insert into t1 values (0, '1');
update t1 set b = b + 1 where a = 0;
select * from t1;
a b
0 2
drop table t1;

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

@ -164,3 +164,13 @@ insert into t1 values (1, "t1c2-1", 10), (2, "t1c2-2", 20);
update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1"; update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1";
update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1" where t1.c3 = 10; update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1" where t1.c3 = 10;
drop table t1, t2; drop table t1, t2;
#
# Bug #8942: a problem with update and partial key part
#
create table t1 (a int, b char(255), key(a, b(20)));
insert into t1 values (0, '1');
update t1 set b = b + 1 where a = 0;
select * from t1;
drop table t1;

2
sql/key.cc
View File

@ -265,7 +265,7 @@ bool check_if_key_used(TABLE *table, uint idx, List<Item> &fields)
f.rewind(); f.rewind();
while ((field=(Item_field*) f++)) while ((field=(Item_field*) f++))
{ {
if (key_part->field == field->field) if (key_part->field->eq(field->field))
return 1; return 1;
} }
} }