MDEV-15363 Wrong result for CAST(LAST_DAY(TIME'00:00:00') AS TIME)

This problem was earlier fixed by the patch for MDEV-15340.
Adding tests only.

mysql-test/main/func_time.result

@@ -3559,3 +3559,12 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where subtime(`test`.`t1`.`a`,TIME'00:00:01') = TIME'00:00:09' and addtime(`test`.`t1`.`a`,TIME'00:00:01') <= TIME'00:00:09'
 DROP TABLE t1;
+#
+# MDEV-15363 Wrong result for CAST(LAST_DAY(TIME'00:00:00') AS TIME)
+#
+SELECT
+LAST_DAY(TIME'00:00:00') AS c1,
+CAST(CAST(LAST_DAY(TIME'00:00:00') AS DATE) AS TIME) AS c2,
+CAST(LAST_DAY(TIME'00:00:00') AS TIME) AS c3;
+c1	c2	c3
+2018-08-31	00:00:00	00:00:00

mysql-test/main/func_time.test

@@ -2149,3 +2149,13 @@ SELECT * FROM t1 WHERE ADDTIME(a,TIME'00:00:01')<=TIME'00:00:09';
 SELECT * FROM t1 WHERE SUBTIME(a,TIME'00:00:01')=TIME'00:00:09' AND ADDTIME(a,TIME'00:00:01')<=TIME'00:00:09'; 
 EXPLAIN EXTENDED SELECT * FROM t1 WHERE SUBTIME(a,TIME'00:00:01')=TIME'00:00:09' AND ADDTIME(a,TIME'00:00:01')<=TIME'00:00:09'; 
 DROP TABLE t1;
+
+
+--echo #
+--echo # MDEV-15363 Wrong result for CAST(LAST_DAY(TIME'00:00:00') AS TIME)
+--echo #
+
+SELECT
+  LAST_DAY(TIME'00:00:00') AS c1,
+  CAST(CAST(LAST_DAY(TIME'00:00:00') AS DATE) AS TIME) AS c2,
+  CAST(LAST_DAY(TIME'00:00:00') AS TIME) AS c3;