fixed subquery with PS (BUG#2462)

fixed UNION preparation


sql/item.cc:
  debug output added
sql/item.h:
  debug output added
sql/item_cmpfunc.cc:
  correct cleunup() for Item_in_optimizer
sql/item_cmpfunc.h:
  correct cleunup() for Item_in_optimizer
  debug output added
sql/item_func.h:
  debug output added
sql/item_subselect.cc:
  support of prepared statemnts added - mostly memorry allocation manegement, only one trabsformatio & correct cleupup()
sql/item_subselect.h:
  support of prepared statemnts added - mostly memorry allocation manegement, only one trabsformatio & correct cleupup()
sql/item_sum.cc:
  debug output added
sql/item_sum.h:
  debug output added
sql/sql_class.cc:
  function to switch allocation arena for Items
sql/sql_class.h:
  function to switch allocation arena for Items
  pointer on current prepared statement added
sql/sql_lex.cc:
  comment fixed
sql/sql_lex.h:
  item cleanup support
sql/sql_prepare.cc:
  - fixed preparation of PS to avoid storing junk in its memory + correct work with union
  - fixed tables cleanup for UNION & subqueries
sql/sql_select.cc:
  removed condition which is always true for now
  fixed layout
sql/sql_union.cc:
  support of UNION subquery cleanup
tests/client_test.c:
  test of repeatable subqueries
  test of correct UNION initialisation

1 files changed, 5 insertions, 0 deletions

diff --git a/sql/item_cmpfunc.h b/sql/item_cmpfunc.h
index 7079fcf193d..5235a94c00a 100644
--- a/sql/item_cmpfunc.h
+++ b/sql/item_cmpfunc.h
@@ -105,6 +105,7 @@ public:
     Item_in_optimizer return NULL, else it evaluate Item_in_subselect.
   */
   longlong val_int();
+  void cleanup();
   const char *func_name() const { return "<in_optimizer>"; }
   Item_cache **get_cache() { return &cache; }
 };
@@ -207,9 +208,11 @@ public:
   }
   void cleanup()
   {
+    DBUG_ENTER("Item_bool_rowready_func2::cleanup");
     Item_bool_func2::cleanup();
     tmp_arg[0]= orig_a;
     tmp_arg[1]= orig_b;
+    DBUG_VOID_RETURN;
   }
 };
 
@@ -718,10 +721,12 @@ class Item_func_in :public Item_int_func
   void fix_length_and_dec();
   void cleanup()
   {
+    DBUG_ENTER("Item_func_in::cleanup");
     delete array;
     delete in_item;
     array= 0;
     in_item= 0;
+    DBUG_VOID_RETURN;
   }
   optimize_type select_optimize() const
     { return array ? OPTIMIZE_KEY : OPTIMIZE_NONE; }