args_copy and cleunup() removed from Item_sum

registration changing ITEM_SUM arguments added


sql/item.cc:
  cleunup for Item_result_field
sql/item.h:
  cleunup for Item_result_field
sql/item_sum.cc:
  args_copy and cleunup() removed from Item_sum
sql/item_sum.h:
  args_copy and cleunup() removed from Item_sum
sql/sql_select.cc:
  registration changing ITEM_SUM arguments

sql/item.cc

@@ -2629,6 +2629,14 @@ String *Item_type_holder::val_str(String*)
   return 0;
 }
 
+void Item_result_field::cleanup()
+{
+  DBUG_ENTER("Item_result_field::cleanup()");
+  Item::cleanup();
+  result_field= 0;
+  DBUG_VOID_RETURN;
+}
+
 /*****************************************************************************
 ** Instantiate templates
 *****************************************************************************/

sql/item.h

@@ -774,6 +774,7 @@ class Item_result_field :public Item	/* Item with result field */
   {
     save_in_field(result_field, no_conversions);
   }
+  void cleanup();
 };
 
 

sql/item_sum.cc

@@ -24,7 +24,7 @@
 #include "mysql_priv.h"
 
 Item_sum::Item_sum(List<Item> &list)
-  :args_copy(0), arg_count(list.elements)
+  :arg_count(list.elements)
 {
   if ((args=(Item**) sql_alloc(sizeof(Item*)*arg_count)))
   {
@@ -56,39 +56,6 @@ Item_sum::Item_sum(THD *thd, Item_sum *item):
     if (!(args= (Item**) thd->alloc(sizeof(Item*)*arg_count)))
       return;
   memcpy(args, item->args, sizeof(Item*)*arg_count);
-  if (item->args_copy != 0)
-    save_args(thd);
-  else
-    args_copy= 0;
-}
-
-
-/*
-  Save copy of arguments if we prepare prepared statement
-  (arguments can be rewritten in get_tmp_table_item())
-
-  SYNOPSIS
-    Item_sum::save_args_for_prepared_statement()
-    thd		- thread handler
-
-  RETURN
-    0 - OK
-    1 - Error
-*/
-bool Item_sum::save_args_for_prepared_statement(THD *thd)
-{
-  if (thd->current_arena->is_stmt_prepare())
-    return save_args(thd->current_arena);
-  return 0;
-}
-
-
-bool Item_sum::save_args(Item_arena* arena)
-{
-  if (!(args_copy= (Item**) arena->alloc(sizeof(Item*)*arg_count)))
-    return 1;
-  memcpy(args_copy, args, sizeof(Item*)*arg_count);
-  return 0;
 }
 
 
@@ -99,17 +66,6 @@ void Item_sum::mark_as_sum_func()
 }
 
 
-void Item_sum::cleanup()
-{
-  DBUG_ENTER("Item_sum::cleanup");
-  Item_result_field::cleanup();
-  if (args_copy != 0)
-    memcpy(args, args_copy, sizeof(Item*)*arg_count);
-  result_field=0;
-  DBUG_VOID_RETURN;
-}
-
-
 void Item_sum::make_field(Send_field *tmp_field)
 {
   if (args[0]->type() == Item::FIELD_ITEM && keep_field_type())
@@ -214,9 +170,6 @@ Item_sum_num::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
 {
   DBUG_ASSERT(fixed == 0);
 
-  if (save_args_for_prepared_statement(thd))
-    return 1;
-  
   if (!thd->allow_sum_func)
   {
     my_error(ER_INVALID_GROUP_FUNC_USE,MYF(0));
@@ -248,9 +201,6 @@ Item_sum_hybrid::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
 {
   DBUG_ASSERT(fixed == 0);
 
-  if (save_args_for_prepared_statement(thd))
-    return 1;
-
   Item *item= args[0];
   if (!thd->allow_sum_func)
   {
@@ -1948,9 +1898,6 @@ Item_func_group_concat::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
   uint i;			/* for loop variable */ 
   DBUG_ASSERT(fixed == 0);
 
-  if (save_args_for_prepared_statement(thd))
-    return 1;
-
   if (!thd->allow_sum_func)
   {
     my_error(ER_INVALID_GROUP_FUNC_USE,MYF(0));

sql/item_sum.h

@@ -33,23 +33,22 @@ class Item_sum :public Item_result_field
   };
 
   Item **args, *tmp_args[2];
-  Item **args_copy;			/* copy of arguments for PS */
   uint arg_count;
   bool quick_group;			/* If incremental update of fields */
 
   void mark_as_sum_func();
-  Item_sum() :args_copy(0), arg_count(0), quick_group(1) 
+  Item_sum() :arg_count(0), quick_group(1) 
   {
     mark_as_sum_func();
   }
   Item_sum(Item *a)
-    :args(tmp_args), args_copy(0), arg_count(1), quick_group(1)
+    :args(tmp_args), arg_count(1), quick_group(1)
   {
     args[0]=a;
     mark_as_sum_func();
   }
   Item_sum( Item *a, Item *b )
-    :args(tmp_args), args_copy(0),  arg_count(2), quick_group(1)
+    :args(tmp_args), arg_count(2), quick_group(1)
   {
     args[0]=a; args[1]=b;
     mark_as_sum_func();
@@ -57,7 +56,6 @@ class Item_sum :public Item_result_field
   Item_sum(List<Item> &list);
   //Copy constructor, need to perform subselects with temporary tables
   Item_sum(THD *thd, Item_sum *item);
-  void cleanup();
   enum Type type() const { return SUM_FUNC_ITEM; }
   virtual enum Sumfunctype sum_func () const=0;
   inline bool reset() { clear(); return add(); };
@@ -92,8 +90,6 @@ class Item_sum :public Item_result_field
   virtual bool setup(THD *thd) {return 0;}
   virtual void make_unique() {}
   Item *get_tmp_table_item(THD *thd);
-  bool save_args_for_prepared_statement(THD *);
-  bool save_args(Item_arena *arena);
 
   bool walk (Item_processor processor, byte *argument);
 };

sql/sql_select.cc

@@ -4940,7 +4940,8 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
       ((Item_sum*) item)->result_field=0;
       for (i=0 ; i < ((Item_sum*) item)->arg_count ; i++)
       {
-	Item *arg= ((Item_sum*) item)->args[i];
+	Item **argp= ((Item_sum*) item)->args + i;
+	Item *arg= *argp;
 	if (!arg->const_item())
 	{
 	  Field *new_field=
@@ -4956,7 +4957,8 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
 	    *blob_field++= new_field;
 	    blob_count++;
 	  }
-	  ((Item_sum*) item)->args[i]= new Item_field(new_field);
+          thd->register_item_tree_change(argp, arg, &thd->mem_root);
+	  *argp= new Item_field(new_field);
 	  if (!(new_field->flags & NOT_NULL_FLAG))
           {
 	    null_count++;
@@ -4964,7 +4966,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
               new_field->maybe_null() is still false, it will be
               changed below. But we have to setup Item_field correctly
             */
-            ((Item_sum*) item)->args[i]->maybe_null=1;
+            (*argp)->maybe_null=1;
           }
 	}
       }