A preparatory patch to help adding JOIN::transform() and move one-time

query transformations to the PREPARE stage (prepared statements).

sql/item.h

@@ -716,10 +716,6 @@ public:
   void cleanup();
   bool remove_dependence_processor(byte * arg);
   void print(String *str);
-
-  friend bool insert_fields(THD *thd,TABLE_LIST *tables, const char *db_name,
-                            const char *table_name, List_iterator<Item> *it,
-                            bool any_privileges, bool allocate_view_names);
 };
 
 class Item_equal;

sql/mysql_priv.h

@@ -894,8 +894,7 @@ bool get_key_map_from_key_list(key_map *map, TABLE *table,
                                List<String> *index_list);
 bool insert_fields(THD *thd,TABLE_LIST *tables,
 		   const char *db_name, const char *table_name,
-		   List_iterator<Item> *it, bool any_privileges,
+		   List_iterator<Item> *it, bool any_privileges);
-                   bool allocate_view_names);
 bool setup_tables(THD *thd, TABLE_LIST *tables, Item **conds,
 		  TABLE_LIST **leaves, bool select_insert);
 int setup_wild(THD *thd, TABLE_LIST *tables, List<Item> &fields,

sql/sp_head.cc

@@ -682,6 +682,7 @@ sp_head::execute(THD *thd)
 
   cleanup_items(thd->current_arena->free_list);
   thd->current_arena= old_arena;
+  state= EXECUTED;
 
  done:
   DBUG_PRINT("info", ("ret=%d killed=%d query_error=%d",

sql/sql_base.cc

@@ -3051,7 +3051,7 @@ int setup_wild(THD *thd, TABLE_LIST *tables, List<Item> &fields,
       }
       else if (insert_fields(thd,tables,((Item_field*) item)->db_name,
                              ((Item_field*) item)->table_name, &it,
-                             any_privileges, arena != 0))
+                             any_privileges))
       {
 	if (arena)
 	  thd->restore_backup_item_arena(arena, &backup);
@@ -3304,8 +3304,6 @@ bool get_key_map_from_key_list(key_map *map, TABLE *table,
     any_privileges	0 If we should ensure that we have SELECT privileges
 		          for all columns
                         1 If any privilege is ok
-    allocate_view_names if true view names will be copied to current Query_arena
-                        memory (made for SP/PS)
   RETURN
     0	ok
         'it' is updated to point at last inserted
@@ -3315,7 +3313,7 @@ bool get_key_map_from_key_list(key_map *map, TABLE *table,
 bool
 insert_fields(THD *thd, TABLE_LIST *tables, const char *db_name,
 	      const char *table_name, List_iterator<Item> *it,
-              bool any_privileges, bool allocate_view_names)
+              bool any_privileges)
 {
   /* allocate variables on stack to avoid pool alloaction */
   Field_iterator_table table_iter;
@@ -3506,25 +3504,6 @@ insert_fields(THD *thd, TABLE_LIST *tables, const char *db_name,
           field->query_id=thd->query_id;
           table->used_keys.intersect(field->part_of_key);
         }
-        else if (allocate_view_names &&
-                 thd->lex->current_select->first_execution)
-        {
-	  Item_field *item;
-	  if (alias_used)
-	    item= new Item_field(0,
-				 thd->strdup(tables->alias),
-				 thd->strdup(field_name));
-	  else
-	    item= new Item_field(thd->strdup(tables->view_db.str),
-				 thd->strdup(tables->view_name.str),
-				 thd->strdup(field_name));
-          /*
-            during cleunup() this item will be put in list to replace
-            expression from VIEW
-          */
-          thd->nocheck_register_item_tree_change(it->ref(), item,
-                                                 thd->mem_root);
-        }
       }
       /*
 	All fields are used in case if usual tables (in case of view used

sql/sql_class.h

@@ -699,6 +699,8 @@ public:
   virtual ~Query_arena() {};
 
   inline bool is_stmt_prepare() const { return state == INITIALIZED; }
+  inline bool is_first_sp_execute() const
+  { return state == INITIALIZED_FOR_SP; }
   inline bool is_stmt_prepare_or_first_sp_execute() const
   { return (int)state < (int)PREPARED; }
   inline bool is_first_stmt_execute() const { return state == PREPARED; }

sql/sql_handler.cc

@@ -422,7 +422,7 @@ bool mysql_ha_read(THD *thd, TABLE_LIST *tables,
     }
   }
 
-  if (insert_fields(thd, tables, tables->db, tables->alias, &it, 0, 0))
+  if (insert_fields(thd, tables, tables->db, tables->alias, &it, 0))
     goto err0;
 
   protocol->send_fields(&list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF);

sql/sql_lex.h

@@ -530,7 +530,19 @@ public:
     query processing end even if we use temporary table
   */
   bool subquery_in_having;
-  bool first_execution; /* first execution in SP or PS */
+  /*
+    This variable is required to ensure proper work of subqueries and
+    stored procedures. Generally, one should use the states of
+    Query_arena to determine if it's a statement prepare or first
+    execution of a stored procedure. However, in case when there was an
+    error during the first execution of a stored procedure, the SP body
+    is not expelled from the SP cache. Therefore, a deeply nested
+    subquery might be left unoptimized. So we need this per-subquery
+    variable to inidicate the optimization/execution state of every
+    subquery. Prepared statements work OK in that regard, as in
+    case of an error during prepare the PS is not created.
+  */
+  bool first_execution;
   bool first_cond_optimization;
   /* do not wrap view fields with Item_ref */
   bool no_wrap_view_item;