BUG#6635 - test_if_skip_sort_order() thought it can skip filesort

for fulltext searches too

mysql-test/r/fulltext_order_by.result

@@ -62,6 +62,14 @@ a	rel
 6	0
 4	1
 7	1
+alter table t1 add key m (message);
+explain SELECT message FROM t1 WHERE MATCH (message) AGAINST ('steve') ORDER BY message;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	fulltext	message	message	0		1	Using where; Using filesort
+SELECT message FROM t1 WHERE MATCH (message) AGAINST ('steve') ORDER BY message desc;
+message
+steve is cool
+steve
 drop table t1;
 CREATE TABLE t1 (
 a INT AUTO_INCREMENT PRIMARY KEY,

mysql-test/t/fulltext_order_by.test

@@ -31,6 +31,14 @@ SELECT a, MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) FROM t1 WHERE a=7 an
 SELECT a, FORMAT(MATCH (message) AGAINST ('steve'),6) as rel FROM t1 ORDER BY rel;
 SELECT a, MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) as rel FROM t1 ORDER BY rel;
 
+#
+# BUG#6635 - test_if_skip_sort_order() thought it can skip filesort
+# for fulltext searches too
+#
+alter table t1 add key m (message);
+explain SELECT message FROM t1 WHERE MATCH (message) AGAINST ('steve') ORDER BY message;
+SELECT message FROM t1 WHERE MATCH (message) AGAINST ('steve') ORDER BY message desc;
+
 drop table t1;
 
 #

sql/sql_select.cc

@@ -7142,7 +7142,7 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
   {
     ref_key=	   tab->ref.key;
     ref_key_parts= tab->ref.key_parts;
-    if (tab->type == JT_REF_OR_NULL)
+    if (tab->type == JT_REF_OR_NULL || tab->type == JT_FT)
       DBUG_RETURN(0);
   }
   else if (select && select->quick)		// Range found by opt_range