main.type_date fails around midnight sporadically

main.type_date                           w1 [ fail ]

        Test ended at 2016-06-29 00:00:00

CURRENT_TEST: main.type_date

--- /opt/buildbot-slave/mariadb/dan_demeter2/build/mysql-test/r/type_date.result	2016-06-28 11:45:27.916481633 -0400

+++ /opt/buildbot-slave/mariadb/dan_demeter2/build/mysql-test/r/type_date.reject	2016-06-29 00:00:00.714427156 -0400

@@ -168,27 +168,27 @@

 INSERT INTO t1 VALUES (DATE(NOW()), 1);

 SELECT COUNT(*) FROM t1 WHERE a = NOW();

 COUNT(*)

-0

+1

 EXPLAIN SELECT COUNT(*) FROM t1 WHERE a = NOW();

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables

+1	SIMPLE	t1	system	PRIMARY	NULL	NULL	NULL	1	

 INSERT INTO t1 VALUES (DATE(NOW()), 2);

 SELECT COUNT(*) FROM t1 WHERE a = NOW();

 COUNT(*)

-0

+2

 EXPLAIN SELECT COUNT(*) FROM t1 WHERE a = NOW();

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables

+1	SIMPLE	t1	ref	PRIMARY	PRIMARY	3	const	1	Using where; Using index

 SELECT COUNT(*) FROM t1 WHERE a = NOW() AND b = 1;

 COUNT(*)

-0

+1

 EXPLAIN SELECT COUNT(*) FROM t1 WHERE a = NOW() AND b = 1;

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables

+1	SIMPLE	t1	const	PRIMARY	PRIMARY	7	const,const	1	Using index

 ALTER TABLE t1 DROP PRIMARY KEY;

 SELECT COUNT(*) FROM t1 WHERE a = NOW();

 COUNT(*)

-0

+2

 EXPLAIN SELECT COUNT(*) FROM t1 WHERE a = NOW();

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where

@@ -432,7 +432,7 @@

 explain

 select 1 from t1 as t1_0 inner join t1 as t2 on (t1_0.a <=> now()) join t1 on 1;

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	t1_0	ref	a	a	4	const	0	Using where; Using index

+1	SIMPLE	t1_0	ref	a	a	4	const	1	Using where; Using index

 1	SIMPLE	t2	index	NULL	a	4	NULL	2	Using index; Using join buffer (flat, BNL join)

 1	SIMPLE	t1	index	NULL	a	4	NULL	2	Using index; Using join buffer (incremental, BNL join)

 select 1 from t1 as t1_0 inner join t1 as t2 on (t1_0.a <=> now()) join t1 on 1;