From 560ff1a2ea1e2f438b27a12b65b5f2361e1d6231 Mon Sep 17 00:00:00 2001 From: unknown Date: Sat, 16 Jul 2005 05:31:16 +0400 Subject: 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 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 --- mysql-test/t/update.test | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'mysql-test/t/update.test') diff --git a/mysql-test/t/update.test b/mysql-test/t/update.test index 6a90fb95760..41f7d37e6d0 100644 --- a/mysql-test/t/update.test +++ b/mysql-test/t/update.test @@ -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; -- cgit v1.2.1