WL3527: 5.0 part:

enabled the optional FOR JOIN to all the three
clauses : USE, FORCE and IGNORE

mysql-test/r/select.result

@@ -3636,6 +3636,12 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT 1 FROM t1 IGNORE INDEX FOR JOIN (a) WHERE a = 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+EXPLAIN SELECT 1 FROM t1 USE INDEX FOR JOIN (a) WHERE a = 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	a	a	5	const	1	Using where; Using index
+EXPLAIN SELECT 1 FROM t1 FORCE INDEX FOR JOIN (a) WHERE a = 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	a	a	5	const	1	Using where; Using index
 DROP TABLE t1;
 CREATE TABLE t1 ( f1 int primary key, f2 int, f3 int, f4 int, f5 int, f6 int, checked_out int);
 CREATE TABLE t2 ( f11 int PRIMARY KEY );

mysql-test/t/select.test

@@ -3111,6 +3111,8 @@ DROP TABLE t1,t2,t3;
 CREATE TABLE t1 (a INT, b INT, KEY (a)); INSERT INTO t1 VALUES (1,1),(2,2);
 EXPLAIN SELECT 1 FROM t1 WHERE a = 1;
 EXPLAIN SELECT 1 FROM t1 IGNORE INDEX FOR JOIN (a) WHERE a = 1;
+EXPLAIN SELECT 1 FROM t1 USE INDEX FOR JOIN (a) WHERE a = 1;
+EXPLAIN SELECT 1 FROM t1 FORCE INDEX FOR JOIN (a) WHERE a = 1;
 DROP TABLE t1;
 
 #

sql/sql_yacc.yy

@@ -1092,7 +1092,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 	key_alg opt_btree_or_rtree
 
 %type <string_list>
-	key_usage_list key_usage_list_inner using_list
+	key_usage_list using_list
 
 %type <key_part>
 	key_part
@@ -5907,19 +5907,15 @@ opt_key_definition:
 	    sel->use_index_ptr= &sel->use_index;
 	    sel->table_join_options|= TL_OPTION_FORCE_INDEX;
 	  }
-	| IGNORE_SYM key_or_index opt_for_join key_usage_list_inner
+	| IGNORE_SYM key_usage_list
 	  {
 	    SELECT_LEX *sel= Select;
-	    sel->ignore_index= *$4;
+	    sel->ignore_index= *$2;
 	    sel->ignore_index_ptr= &sel->ignore_index;
 	  };
 
 key_usage_list:
-	key_or_index key_usage_list_inner
-        { $$= $2; }
-	;
-
-key_usage_list_inner:
+        key_or_index opt_for_join      
 	{ Select->interval_list.empty(); }
         '(' key_list_or_empty ')'
         { $$= &Select->interval_list; }