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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.



sql/sql_select.cc:
  Fix bug #11868 NOT NULL ref optimization in subquery used in update must be
  disabled if ref is built with a key from the updated table
mysql-test/r/update.result:
  Test case for bug#11868 Update with subquery with ref built with a key from
  the updated table crashes server.
mysql-test/t/update.test:
  Test case for bug#11868 Update with subquery with ref built with a key from the updated table crashes server
This commit is contained in:
unknown 2005-07-16 05:31:16 +04:00
commit 560ff1a2ea
3 changed files with 30 additions and 1 deletions
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13
mysql-test/t/update.test
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@ -201,3 +201,16 @@ analyze table t1,t2;
update t1, t2 set t1.a = t2.a where t2.b = t1.b;
show warnings;
drop table t1, t2;
#
# Bug #11868 Update with subquery with ref built with a key from the updated
# table crashes server
#
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;
drop table t1,t2;