Fixed LP bug #880724.

Do not create KEYUSEs for a materialized view over a constant table.

mysql-test/r/derived_view.result

@@ -1701,4 +1701,44 @@ WHERE t.b <> 0 AND t.c = t1.a;
 b	c	a
 8	c	c
 DROP TABLE t1,t2,t3;
+#
+# Bug #880724: materialized const view as inner table of outer join
+#
+CREATE TABLE t1 (a int, b varchar(1));
+INSERT INTO t1 VALUES (9,NULL), (6,'r'), (7,'c');
+CREATE TABLE t2 (a int);
+INSERT INTO t2 VALUES (6);
+CREATE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2;
+SET SESSION optimizer_switch = 'derived_with_keys=on';
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT t1.b,v2.a  FROM t1 LEFT JOIN v2 ON v2.a = t1.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	1	Using where
+2	DERIVED	t2	system	NULL	NULL	NULL	NULL	1	
+SELECT t1.b,v2.a  FROM t1 LEFT JOIN v2 ON v2.a = t1.a;
+b	a
+NULL	NULL
+r	6
+c	NULL
+CREATE TABLE t3 (a int, b varchar(1));
+INSERT INTO t3 VALUES (8,'x'), (5,'r'), (9,'y');
+EXPLAIN
+SELECT * FROM t3
+WHERE t3.b <> ANY (SELECT t1.b  FROM t1 LEFT JOIN v2 ON v2.a = t1.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	Using where
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	1	Using where
+3	DERIVED	t2	system	NULL	NULL	NULL	NULL	1	
+SELECT * FROM t3
+WHERE t3.b <> ANY (SELECT t1.b  FROM t1 LEFT JOIN v2 ON v2.a = t1.a);
+a	b
+8	x
+5	r
+9	y
+SET SESSION join_cache_level = default;
+DROP VIEW v2;
+DROP TABLE t1,t2,t3;
 set optimizer_switch=@exit_optimizer_switch;

mysql-test/t/derived_view.test

@@ -1107,5 +1107,38 @@ FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
 
 DROP TABLE t1,t2,t3;
 
+--echo #
+--echo # Bug #880724: materialized const view as inner table of outer join
+--echo #
+
+CREATE TABLE t1 (a int, b varchar(1));
+INSERT INTO t1 VALUES (9,NULL), (6,'r'), (7,'c');
+
+CREATE TABLE t2 (a int);
+INSERT INTO t2 VALUES (6);
+
+CREATE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2;
+
+SET SESSION optimizer_switch = 'derived_with_keys=on';
+SET SESSION join_cache_level = 4;
+
+EXPLAIN
+SELECT t1.b,v2.a  FROM t1 LEFT JOIN v2 ON v2.a = t1.a;
+SELECT t1.b,v2.a  FROM t1 LEFT JOIN v2 ON v2.a = t1.a;
+
+CREATE TABLE t3 (a int, b varchar(1));
+INSERT INTO t3 VALUES (8,'x'), (5,'r'), (9,'y');
+
+EXPLAIN
+SELECT * FROM t3
+  WHERE t3.b <> ANY (SELECT t1.b  FROM t1 LEFT JOIN v2 ON v2.a = t1.a);
+SELECT * FROM t3
+  WHERE t3.b <> ANY (SELECT t1.b  FROM t1 LEFT JOIN v2 ON v2.a = t1.a);
+
+SET SESSION join_cache_level = default;
+
+DROP VIEW v2;
+DROP TABLE t1,t2,t3;
+
 # The following command must be the last one the file 
 set optimizer_switch=@exit_optimizer_switch;

sql/sql_select.cc

@@ -3827,7 +3827,9 @@ add_key_field(JOIN *join,
   uint optimize= 0;  
   if (eq_func &&
       ((join->is_allowed_hash_join_access() &&
-        field->hash_join_is_possible()) ||
+        field->hash_join_is_possible() && 
+        !(field->table->pos_in_table_list->is_materialized_derived() &&
+          field->table->created)) ||
        (field->table->pos_in_table_list->is_materialized_derived() &&
         !field->table->created)))
   {