MDEV-5750 Assertion `ltime->year == 0' fails on a query with EXTRACT DAY_MINUTE and TIME column

Item_func_min_max::get_date() did not clear ltime->year when returning a TIME value.

mysql-test/r/func_time.result

@@ -2389,3 +2389,18 @@ c1	c2
 9923-03-10 22:47:10.0	NULL
 Warnings:
 Warning	1292	Truncated incorrect DECIMAL value: '2000000000000000000.0'
+#
+# MDEV-5750 Assertion `ltime->year == 0' fails on a query with EXTRACT DAY_MINUTE and TIME column
+#
+CREATE TABLE t1 ( d DATE, t TIME );
+INSERT INTO t1 VALUES ('2008-12-05','22:34:09'),('2005-03-27','14:26:02');
+SELECT EXTRACT(DAY_MINUTE FROM GREATEST(t,d)), GREATEST(t,d) FROM t1;
+EXTRACT(DAY_MINUTE FROM GREATEST(t,d))	GREATEST(t,d)
+342259	838:59:59
+342259	838:59:59
+Warnings:
+Warning	1292	Truncated incorrect time value: '9336:00:00'
+Warning	1292	Truncated incorrect time value: '9336:00:00'
+Warning	1292	Truncated incorrect time value: '2952:00:00'
+Warning	1292	Truncated incorrect time value: '2952:00:00'
+DROP TABLE t1;

mysql-test/t/func_time.test

@@ -1442,3 +1442,12 @@ DROP TABLE t1;
 --echo # MDEV-6099 Bad results for DATE_ADD(.., INTERVAL 2000000000000000000.0 SECOND)
 --echo #
 SELECT DATE_ADD('2001-01-01 10:20:30',INTERVAL 250000000000.0 SECOND) AS c1, DATE_ADD('2001-01-01 10:20:30',INTERVAL 2000000000000000000.0 SECOND) AS c2;
+
+
+--echo #
+--echo # MDEV-5750 Assertion `ltime->year == 0' fails on a query with EXTRACT DAY_MINUTE and TIME column
+--echo #
+CREATE TABLE t1 ( d DATE, t TIME );
+INSERT INTO t1 VALUES ('2008-12-05','22:34:09'),('2005-03-27','14:26:02');
+SELECT EXTRACT(DAY_MINUTE FROM GREATEST(t,d)), GREATEST(t,d) FROM t1;
+DROP TABLE t1;

sql/item_func.cc

@@ -2646,7 +2646,7 @@ bool Item_func_min_max::get_date(MYSQL_TIME *ltime, uint fuzzy_date)
   {
     ltime->time_type= MYSQL_TIMESTAMP_TIME;
     ltime->hour+= (ltime->month * 32 + ltime->day) * 24;
-    ltime->month= ltime->day= 0;
+    ltime->year= ltime->month= ltime->day= 0;
     if (adjust_time_range_with_warn(ltime,
                                     min(decimals, TIME_SECOND_PART_DIGITS)))
       return (null_value= true);