support parse sql like : DELETE FROM a1, a2 USING t1 AS a1 INNER JOIN t2 AS a2 WHERE a1.id=a2.id; related issue: vitessio/vitess#3787

Signed-off-by: xhh1989 <[email protected]>

Author: xhh1989

parse_test.go

@@ -665,6 +665,9 @@ var (
 		input: "delete a from a join b on a.id = b.id where b.name = 'test'",
 	}, {
 		input: "delete a, b from a, b where a.id = b.id and b.name = 'test'",
+	}, {
+		input:  "delete from a1, a2 using t1 as a1 inner join t2 as a2 where a1.id=a2.id",
+		output: "delete a1, a2 from t1 as a1 join t2 as a2 where a1.id = a2.id",
 	}, {
 		input: "set /* simple */ a = 3",
 	}, {