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-rw-r--r--mysql-test/t/join_outer.test18
1 files changed, 18 insertions, 0 deletions
diff --git a/mysql-test/t/join_outer.test b/mysql-test/t/join_outer.test
index c670944c9b2..2c243aabeb6 100644
--- a/mysql-test/t/join_outer.test
+++ b/mysql-test/t/join_outer.test
@@ -897,3 +897,21 @@ FROM t1 JOIN t2 USING( a )
GROUP BY t1.a WITH ROLLUP;
DROP TABLE t1, t2;
+
+--echo #
+--echo # Bug#51598 Inconsistent behaviour with a COALESCE statement inside an IN comparison
+--echo #
+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));
+
+SELECT * FROM t1 LEFT JOIN t2 ON t1.f2 = t2.f2
+WHERE (COALESCE(t1.f1, t2.f1), f3) IN ((1, 3), (2, 2));
+
+DROP TABLE t1, t2;
+
+--echo End of 5.1 tests