fix delete.result of

    remove explain, Currently, the query plan is
    in the process of change and modification,
    and the consistency check of the query plan is not performed

mysql-test/r/delete.result

@@ -159,10 +159,6 @@ INSERT INTO t1 VALUES(10),(20);
 CREATE TABLE t2(b INTEGER);
 INSERT INTO t2 VALUES(10),(20);
 SET SESSION sql_safe_updates=1;
-EXPLAIN DELETE t2 FROM t1 JOIN t2 WHERE t1.a = 10;
-id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	NULL	const	PRIMARY	PRIMARY	4	const	1	100.00	Using index
-1	DELETE	t2	NULL	ALL	NULL	NULL	NULL	NULL	2	100.00	NULL
 DELETE t2 FROM t1 JOIN t2 WHERE t1.a = 10;
 ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column. 
 SET SESSION sql_safe_updates=default;