Merge

sql/item_cmpfunc.cc:
  Auto merged
sql/item_cmpfunc.h:
  Auto merged
mysql-test/r/select.result:
  SCCS merged
mysql-test/t/select.test:
  SCCS merged

1 files changed, 13 insertions, 0 deletions

diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index e2c4609d902..b764ffd3c80 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -3337,6 +3337,19 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	Using index
 1	SIMPLE	t3	const	PRIMARY	PRIMARY	8	const,const	1	
 DROP TABLE t1,t2,t3;
+create table t1 (f1 int unique);
+create table t2 (f2 int unique);
+create table t3 (f3 int unique);
+insert into t1 values(1),(2);
+insert into t2 values(1),(2);
+insert into t3 values(1),(NULL);
+select * from t3 where f3 is null;
+f3
+NULL
+select t2.f2 from t1 left join t2 on f1=f2 join t3 on f1=f3 where f1=1;
+f2
+1
+drop table t1,t2,t3;
 create table t1(f1 char, f2 char not null);
 insert into t1 values(null,'a');
 create table t2 (f2 char not null);