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Fix bug#11868 NOT NULL ref optimization in subquery used in update must be

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disabled if ref is built with a key from the updated table

Problem was in add_not_null_conds() optimization function.
It contains following code:
JOIN_TAB *referred_tab= not_null_item->field->table->reginfo.join_tab;
...
add_cond_and_fix(&referred_tab->select_cond, notnull);
For UPDATE described in bug report referred_tab is 0 and dereferencing it
crashes the server.
This commit is contained in:
evgen@moonbone.local
2005-07-16 05:31:16 +04:00
parent 0298bc347a
commit 81d93df1ae
3 changed files with 30 additions and 1 deletions
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11
mysql-test/r/update.result
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@ -240,3 +240,14 @@ update t1, t2 set t1.a = t2.a where t2.b = t1.b;
show warnings;
Level Code Message
drop table t1, t2;
create table t1(f1 int, f2 int);
create table t2(f3 int, f4 int);
create index idx on t2(f3);
insert into t1 values(1,0),(2,0);
insert into t2 values(1,1),(2,2);
UPDATE t1 SET t1.f2=(SELECT MAX(t2.f4) FROM t2 WHERE t2.f3=t1.f1);
select * from t1;
f1 f2
1 1
2 2
drop table t1,t2;