From 0a50e43e9df2f1e005591e22388e6d20f82edf72 Mon Sep 17 00:00:00 2001
From: Alexander Barkov <bar@mariadb.org>
Date: Thu, 16 Jun 2016 14:57:32 +0400
Subject: [PATCH] MDEV-9374 having '2015-01-01 01:00:00.000001' >
 coalesce(NULL) returns true The problem was earlier fixed by the patch for
 MDEV-9521. Adding tests only.

---
 mysql-test/r/type_datetime.result | 8 ++++++++
 mysql-test/t/type_datetime.test   | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/mysql-test/r/type_datetime.result b/mysql-test/r/type_datetime.result
index 82b64d30d96..e033fe48607 100644
--- a/mysql-test/r/type_datetime.result
+++ b/mysql-test/r/type_datetime.result
@@ -834,5 +834,13 @@ a	b	a	b
 DEALLOCATE PREPARE stmt1;
 DROP TABLE t1,t2;
 #
+# MDEV-9374 having '2015-01-01 01:00:00.000001' > coalesce(NULL) returns true
+#
+CREATE TABLE t1 (c1 DATETIME(0));
+INSERT INTO t1 VALUES (NULL);
+SELECT * FROM t1 HAVING '2015-01-01 01:00:00.000001' > COALESCE(c1);
+c1
+DROP TABLE t1;
+#
 # End of 5.5 tests
 #
diff --git a/mysql-test/t/type_datetime.test b/mysql-test/t/type_datetime.test
index e44b190def0..3f96673c43f 100644
--- a/mysql-test/t/type_datetime.test
+++ b/mysql-test/t/type_datetime.test
@@ -610,6 +610,14 @@ EXECUTE stmt1;
 DEALLOCATE PREPARE stmt1;
 DROP TABLE t1,t2;
 
+--echo #
+--echo # MDEV-9374 having '2015-01-01 01:00:00.000001' > coalesce(NULL) returns true
+--echo #
+CREATE TABLE t1 (c1 DATETIME(0));
+INSERT INTO t1 VALUES (NULL);
+SELECT * FROM t1 HAVING '2015-01-01 01:00:00.000001' > COALESCE(c1);
+DROP TABLE t1;
+
 --echo #
 --echo # End of 5.5 tests
 --echo #