memory leacks in PS with subqueries fixed (adddition to fix of BUG#2462)

sql/item.h:
  mechanism to keep reference in cache array for row IN
sql/item_cmpfunc.cc:
  mechanism to keep reference in cache array for row IN
  layout fixed
sql/item_cmpfunc.h:
  mechanism to keep reference in cache array for row IN
sql/item_subselect.cc:
  fixed memory pools swapping
  prevented deleting Item_in_optimizer cache in case of row IN subquery
sql/mysql_priv.h:
  declarations of function moved to be useful in sql_class.h
sql/sql_base.cc:
  keep fields expanded from '*' in statement memory pool
sql/sql_class.cc:
  fixed restoring/backup of memory pool and list of items
sql/sql_class.h:
  memory allocation methods moved to Statement
  memory pool substituting for preparing
sql/sql_lex.cc:
  ref_pointer_array kept in statement memory
sql/sql_lex.h:
  reinitialization of UNIT
sql/sql_prepare.cc:
  memory allocation/swapping fixed
tests/client_test.c:
  layout fixed

1 files changed, 10 insertions, 4 deletions

diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index f08cf5cf967..4bc04ddf9ac 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -1496,11 +1496,17 @@ bool st_select_lex::setup_ref_array(THD *thd, uint order_group_num)
 {
   if (ref_pointer_array)
     return 0;
+
+  /*
+    We have to create array in prepared statement memory if it is
+    prepared statement
+  */
+  Statement *stmt= thd->current_statement ? thd->current_statement : thd;
   return (ref_pointer_array= 
-	  (Item **)thd->alloc(sizeof(Item*) *
-			      (item_list.elements +
-			       select_n_having_items +
-			       order_group_num)* 5)) == 0;
+	  (Item **)stmt->alloc(sizeof(Item*) *
+			       (item_list.elements +
+				select_n_having_items +
+				order_group_num)* 5)) == 0;
 }