MDEV-18240 Assertion `0' failed in Item_cache_timestamp::val_datetime_packed

mysql-test/main/type_timestamp.result

@@ -1218,5 +1218,26 @@ NULL
 2018-10-14 15:31:02.00000
 DROP TABLE t1;
 #
+# MDEV-18240 Assertion `0' failed in Item_cache_timestamp::val_datetime_packed
+#
+CREATE TABLE t1 (c1 timestamp);
+SELECT MIN(t1.c1) AS k1 FROM t1 HAVING (k1 >= ALL(SELECT 'a' UNION SELECT 'r'));
+k1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: 'r'
+SELECT * FROM t1 HAVING MIN(t1.c1) >= ALL(SELECT 'a' UNION SELECT 'r');
+c1
+Warnings:
+Warning	1292	Truncated incorrect datetime value: 'r'
+DROP TABLE t1;
+CREATE TABLE t1 (c1 timestamp);
+INSERT INTO t1 VALUES ('2010-01-01 00:00:00');
+SELECT * FROM t1 HAVING MIN(t1.c1) >= ALL(SELECT '2010-01-01 10:00:00' UNION SELECT '2001-01-01 10:00:01');
+c1
+SELECT * FROM t1 HAVING MIN(t1.c1) >= ALL(SELECT '2000-01-01 10:00:00' UNION SELECT '2000-01-01 10:00:01');
+c1
+2010-01-01 00:00:00
+DROP TABLE t1;
+#
 # End of 10.4 tests
 #

mysql-test/main/type_timestamp.test

@@ -800,6 +800,20 @@ SELECT LEAD(d1,1) OVER(ORDER BY d1) FROM t1;
 SELECT LAG(d1,1) OVER(ORDER BY d1) FROM t1;
 DROP TABLE t1;
 
+--echo #
+--echo # MDEV-18240 Assertion `0' failed in Item_cache_timestamp::val_datetime_packed
+--echo #
+
+CREATE TABLE t1 (c1 timestamp);
+SELECT MIN(t1.c1) AS k1 FROM t1 HAVING (k1 >= ALL(SELECT 'a' UNION SELECT 'r'));
+SELECT * FROM t1 HAVING MIN(t1.c1) >= ALL(SELECT 'a' UNION SELECT 'r');
+DROP TABLE t1;
+
+CREATE TABLE t1 (c1 timestamp);
+INSERT INTO t1 VALUES ('2010-01-01 00:00:00');
+SELECT * FROM t1 HAVING MIN(t1.c1) >= ALL(SELECT '2010-01-01 10:00:00' UNION SELECT '2001-01-01 10:00:01');
+SELECT * FROM t1 HAVING MIN(t1.c1) >= ALL(SELECT '2000-01-01 10:00:00' UNION SELECT '2000-01-01 10:00:01');
+DROP TABLE t1;
 
 --echo #
 --echo # End of 10.4 tests

sql/item.h

@@ -6766,8 +6766,7 @@ class Item_cache_timestamp: public Item_cache
   }
   longlong val_datetime_packed(THD *thd)
   {
-    DBUG_ASSERT(0);
-    return 0;
+    return to_datetime(current_thd).to_packed();
   }
   longlong val_time_packed(THD *thd)
   {