From 57d15d62f15e8b17eddf0a5e6c4beee8e78c07b1 Mon Sep 17 00:00:00 2001
From: Sergei Golubchik <sergii@pisem.net>
Date: Tue, 3 Jun 2014 10:52:36 +0200
Subject: [PATCH] Add a test case for MySQL's:   Bug #18167356: EXPLAIN W/
 EXISTS(SELECT* UNION SELECT*)                  WHERE ONE OF SELECT* IS
 DISTINCT FAILS.

the bugfix itself was not merged - MariaDB doesn't have this bug.
---
 mysql-test/r/union.result | 13 +++++++++++--
 mysql-test/t/union.test   | 12 ++++++++++--
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/mysql-test/r/union.result b/mysql-test/r/union.result
index a3ad63c035a..6d99cad30f0 100644
--- a/mysql-test/r/union.result
+++ b/mysql-test/r/union.result
@@ -1876,8 +1876,8 @@ SELECT(SELECT 1 AS a FROM dual ORDER BY a DESC LIMIT 1) AS dev;
 dev
 1
 #
-# LP bug#1010729: Unexpected syntax error from UNION
-# (bug #54382)    with single-table join nest      
+# lp:1010729: Unexpected syntax error from UNION
+# (bug #54382) with single-table join nest      
 #
 CREATE TABLE t1 (a int);
 CREATE TABLE t2 (b int);
@@ -1892,3 +1892,12 @@ UNION
 SELECT t1.pk FROM t1 LEFT JOIN (t2) ON (t1.pk = t2.fk);
 pk
 DROP TABLE t1,t2;
+create table t1 (a int);
+insert t1 values (1),(2),(3),(1);
+explain select 1 from dual where exists (select max(a) from t1 group by a union select a+2 from t1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	4	Using temporary; Using filesort
+3	UNION	t1	ALL	NULL	NULL	NULL	NULL	4	
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
+drop table t1;
diff --git a/mysql-test/t/union.test b/mysql-test/t/union.test
index a53427f7fc6..877509a9fc0 100644
--- a/mysql-test/t/union.test
+++ b/mysql-test/t/union.test
@@ -1274,8 +1274,8 @@ SELECT(SELECT 1 AS a LIMIT 1) AS dev;
 SELECT(SELECT 1 AS a FROM dual ORDER BY a DESC LIMIT 1) AS dev;
 
 --echo #
---echo # LP bug#1010729: Unexpected syntax error from UNION
---echo # (bug #54382)    with single-table join nest      
+--echo # lp:1010729: Unexpected syntax error from UNION
+--echo # (bug #54382) with single-table join nest      
 --echo #
 CREATE TABLE t1 (a int);
 CREATE TABLE t2 (b int);
@@ -1292,3 +1292,11 @@ SELECT t1.pk FROM t1 LEFT JOIN (t2) ON (t1.pk = t2.fk);
 
 DROP TABLE t1,t2;
 
+#
+# Bug #18167356: EXPLAIN W/ EXISTS(SELECT* UNION SELECT*)
+#                WHERE ONE OF SELECT* IS DISTINCT FAILS.
+#
+create table t1 (a int);
+insert t1 values (1),(2),(3),(1);
+explain select 1 from dual where exists (select max(a) from t1 group by a union select a+2 from t1);
+drop table t1;