Merge.

mysql-test/r/view.result

@@ -4246,3 +4246,34 @@ a	MIN(b)
 7	78
 DROP VIEW v1;
 DROP TABLE t1,t2;
+#
+# LP bug #804686: query over a derived table using a view 
+#                 with a degenerated where condition
+#
+CREATE TABLE t1 (a int, b int);
+INSERT INTO t1 VALUES (0,0), (1,0), (0,0), (1,1), (1,0);
+CREATE VIEW v1 AS SELECT a,b FROM t1;
+CREATE VIEW v2 AS SELECT a, MAX(b) AS b FROM t1 GROUP BY a;
+SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b<>0;
+b
+SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b<>0;
+b
+SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b;
+b
+SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b;
+b
+EXPLAIN EXTENDED
+SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+Warnings:
+Note	1003	select `test`.`t1`.`b` AS `b` from `test`.`t1` where 0
+EXPLAIN EXTENDED
+SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `v2`.`b` AS `b` from `test`.`v2` where 0
+DROP VIEW v1,v2;
+DROP TABLE t1;

mysql-test/t/view.test

@@ -4192,3 +4192,24 @@ SELECT a, MIN(b) FROM v1 GROUP BY a;
 DROP VIEW v1;
 DROP TABLE t1,t2;
 
+--echo #
+--echo # LP bug #804686: query over a derived table using a view 
+--echo #                 with a degenerated where condition
+--echo #
+
+CREATE TABLE t1 (a int, b int);
+INSERT INTO t1 VALUES (0,0), (1,0), (0,0), (1,1), (1,0);
+CREATE VIEW v1 AS SELECT a,b FROM t1;
+CREATE VIEW v2 AS SELECT a, MAX(b) AS b FROM t1 GROUP BY a;
+
+SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b<>0;
+SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b<>0;
+SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b;
+SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b;
+EXPLAIN EXTENDED
+SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b;
+EXPLAIN EXTENDED
+SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b;
+
+DROP VIEW v1,v2;
+DROP TABLE t1;

sql/item.cc

@@ -6883,40 +6883,6 @@ bool Item_direct_ref::get_date(MYSQL_TIME *ltime,uint fuzzydate)
 }
 
 
-Item* Item_direct_ref_to_ident::transform(Item_transformer transformer,
-                                          uchar *argument)
-{
-  DBUG_ASSERT(!current_thd->is_stmt_prepare());
-
-  Item *new_item= ident->transform(transformer, argument);
-  if (!new_item)
-    return 0;
-  DBUG_ASSERT(new_item->type() == FIELD_ITEM || new_item->type() == REF_ITEM);
-
-  if (ident != new_item)
-    current_thd->change_item_tree((Item**)&ident, new_item);
-  return (this->*transformer)(argument);
-}
-
-
-Item* Item_direct_ref_to_ident::compile(Item_analyzer analyzer, uchar **arg_p,
-                                        Item_transformer transformer,
-                                        uchar *arg_t)
-{
-  if (!(this->*analyzer)(arg_p))
-    return 0;
-
-  uchar *arg_v= *arg_p;
-  Item *new_item= ident->compile(analyzer, &arg_v, transformer, arg_t);
-  if (new_item && ident != new_item)
-  {
-    DBUG_ASSERT(new_item->type() == FIELD_ITEM || new_item->type() == REF_ITEM);
-    current_thd->change_item_tree((Item**)&ident, new_item);
-  }
-  return (this->*transformer)(arg_t);
-}
-
-
 Item_cache_wrapper::~Item_cache_wrapper()
 {
   DBUG_ASSERT(expr_cache == 0);

sql/item.h

@@ -2570,8 +2570,8 @@ class Item_ref :public Item_ident
   Field *get_tmp_table_field()
   { return result_field ? result_field : (*ref)->get_tmp_table_field(); }
   Item *get_tmp_table_item(THD *thd);
-  inline table_map used_tables() const;		
-  inline void update_used_tables(); 
+  table_map used_tables() const;		
+  void update_used_tables(); 
   bool const_item() const 
   {
     return (*ref)->const_item();
@@ -2713,9 +2713,6 @@ class Item_direct_ref_to_ident :public Item_direct_ref
   virtual void print(String *str, enum_query_type query_type)
   { ident->print(str, query_type); }
 
-  virtual Item* transform(Item_transformer transformer, uchar *arg);
-  virtual Item* compile(Item_analyzer analyzer, uchar **arg_p,
-                        Item_transformer transformer, uchar *arg_t);
 };