changes based on partial revie of task 577 (SCRUM)

sql/item.cc:
  Fixed Item usual constructor to call current_thd only once.
  Fixed copy constructor to receive THD pointer via arguments.
  added comments
  removed counter-1 and unnessesary initializaton of counter
sql/item.h:
  Fixed copy constructor to receive THD pointer via arguments.
  Renamed get_same to copy_or_same.
  THD pointetr added to copy_or_same and get_tmp_table_item.
sql/item_cmpfunc.cc:
  fixed layout
  fixed direct call of destructor
sql/item_func.cc:
  fiex layout
  THD pointetr added to get_tmp_table_item.
sql/item_func.h:
  THD pointetr added to get_tmp_table_item.
sql/item_sum.cc:
  Fixed copy constructor to receive THD pointer via arguments.
  Renamed get_same to copy_or_same.
  THD pointetr added to copy_or_same and get_tmp_table_item.
sql/item_sum.h:
  fixed layout
  Fixed copy constructor to receive THD pointer via arguments.
  Renamed get_same to copy_or_same.
  THD pointetr added to copy_or_same and get_tmp_table_item.
sql/item_uniq.h:
  Fixed copy constructor to receive THD pointer via arguments.
  Renamed get_same to copy_or_same.
  THD pointetr added to copy_or_same and get_tmp_table_item.
sql/sql_base.cc:
  count from 0
sql/sql_select.cc:
  removed counter-1 and unnessesary initializaton of counter
  THD pointetr added to get_tmp_table_item and change_to_use_tmp_fields.

1 files changed, 5 insertions, 4 deletions

diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index 13e70358b05..7ded4921180 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -41,8 +41,9 @@ Item_sum::Item_sum(List<Item> &list)
   list.empty();					// Fields are used
 }
 
-Item_sum::Item_sum(Item_sum &item):
-  Item_result_field(item), quick_group(item.quick_group)
+// Constructor used in processing select with temporary tebles
+Item_sum::Item_sum(THD *thd, Item_sum &item):
+  Item_result_field(thd, item), quick_group(item.quick_group)
 {
   arg_count= item.arg_count;
   if (arg_count <= 2)
@@ -96,9 +97,9 @@ void Item_sum::fix_num_length_and_dec()
   max_length=float_length(decimals);
 }
 
-Item * Item_sum::get_tmp_table_item()
+Item *Item_sum::get_tmp_table_item(THD *thd)
 {
-  Item_sum* sum_item= (Item_sum *) get_same();
+  Item_sum* sum_item= (Item_sum *) copy_or_same(thd);
   if (sum_item && sum_item->result_field)	   // If not a const sum func
   {
     Field *result_field= sum_item->result_field;