MDEV-22256 Assertion `length == pack_length()' failed in Field_timestamp_with_dec::sort_string

Adding 10.2 specific tests only. No code changes.

The problem was earlier fixed by MDEV-21580 and MDEV-22715.

mysql-test/r/order_by.result

@@ -3485,4 +3485,27 @@ b	a
 40	1
 30	4
 drop table t1,t2;
+#
+# MDEV-22256 Assertion `length == pack_length()' failed in Field_timestamp_with_dec::sort_string
+#
+SET sql_mode='';
+SET @@SESSION.max_sort_length=4;
+Warnings:
+Warning	1292	Truncated incorrect max_sort_length value: '4'
+CREATE TABLE t1 (c TIMESTAMP(1));
+INSERT INTO t1 VALUES(0);
+DELETE FROM t1 ORDER BY c;
+DROP TABLE t1;
+SET @@SESSION.max_sort_length=DEFAULT;
+SET sql_mode=DEFAULT;
+SET sql_mode='';
+SET @@SESSION.max_sort_length=1;
+Warnings:
+Warning	1292	Truncated incorrect max_sort_length value: '1'
+CREATE TEMPORARY TABLE t1 (c DATETIME);
+INSERT INTO t1 VALUES(0);
+DELETE FROM t1 ORDER BY c;
+DROP TABLE t1;
+SET @@SESSION.max_sort_length=DEFAULT;
+SET sql_mode=DEFAULT;
 # End of 10.2 tests

mysql-test/t/order_by.test

@@ -2309,4 +2309,27 @@ explain (select b,a from t2 order by a limit 3) order by b desc;
 
 drop table t1,t2;
 
+--echo #
+--echo # MDEV-22256 Assertion `length == pack_length()' failed in Field_timestamp_with_dec::sort_string
+--echo #
+
+SET sql_mode='';
+SET @@SESSION.max_sort_length=4;
+CREATE TABLE t1 (c TIMESTAMP(1));
+INSERT INTO t1 VALUES(0);
+DELETE FROM t1 ORDER BY c;
+DROP TABLE t1;
+SET @@SESSION.max_sort_length=DEFAULT;
+SET sql_mode=DEFAULT;
+
+SET sql_mode='';
+SET @@SESSION.max_sort_length=1;
+CREATE TEMPORARY TABLE t1 (c DATETIME);
+INSERT INTO t1 VALUES(0);
+DELETE FROM t1 ORDER BY c;
+DROP TABLE t1;
+SET @@SESSION.max_sort_length=DEFAULT;
+SET sql_mode=DEFAULT;
+
+
 --echo # End of 10.2 tests