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-rw-r--r--mysql-test/r/join_outer.result20
1 files changed, 20 insertions, 0 deletions
diff --git a/mysql-test/r/join_outer.result b/mysql-test/r/join_outer.result
index 083be3737f7..4543446e807 100644
--- a/mysql-test/r/join_outer.result
+++ b/mysql-test/r/join_outer.result
@@ -1289,3 +1289,23 @@ a COUNT( t2.b ) SUM( t2.b ) MAX( t2.b )
1 3 6 3
NULL 3 6 3
DROP TABLE t1, t2;
+#
+# Bug#51598 Inconsistent behaviour with a COALESCE statement inside an IN comparison
+#
+CREATE TABLE t1(f1 INT, f2 INT, f3 INT);
+INSERT INTO t1 VALUES (1, NULL, 3);
+CREATE TABLE t2(f1 INT, f2 INT);
+INSERT INTO t2 VALUES (2, 1);
+EXPLAIN EXTENDED SELECT * FROM t1 LEFT JOIN t2 ON t1.f2 = t2.f2
+WHERE (COALESCE(t1.f1, t2.f1), f3) IN ((1, 3), (2, 2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
+1 SIMPLE t2 system NULL NULL NULL NULL 1 100.00
+Warnings:
+Note 1003 select '1' AS `f1`,NULL AS `f2`,'3' AS `f3`,NULL AS `f1`,NULL AS `f2` from `test`.`t1` left join `test`.`t2` on(multiple equal(NULL)) where ((coalesce('1',NULL),'3') in ((1,3),(2,2)))
+SELECT * FROM t1 LEFT JOIN t2 ON t1.f2 = t2.f2
+WHERE (COALESCE(t1.f1, t2.f1), f3) IN ((1, 3), (2, 2));
+f1 f2 f3 f1 f2
+1 NULL 3 NULL NULL
+DROP TABLE t1, t2;
+End of 5.1 tests