1 files changed, 31 insertions, 1 deletions
diff --git a/sql/sql_lex.h b/sql/sql_lex.h
index d58be8b336a..6483aa0e44d 100644
--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -667,6 +667,10 @@ public:
 
 typedef class st_select_lex_unit SELECT_LEX_UNIT;
 
+
+#define TOUCHED_SEL_COND 1/* WHERE/HAVING/ON should be reinited before use */
+#define TOUCHED_SEL_DERIVED (1<<1)/* derived should be reinited before use */
+
 /*
   SELECT_LEX - store information of parsed SELECT statment
 */
@@ -822,7 +826,8 @@ public:
     subquery. Prepared statements work OK in that regard, as in
     case of an error during prepare the PS is not created.
   */
-  bool first_execution;
+  uint8 changed_elements; // see TOUCHED_SEL_*
+  /* TODO: add foloowing first_* to bitmap above */
   bool first_natural_join_processing;
   bool first_cond_optimization;
   /* do not wrap view fields with Item_ref */
@@ -2772,6 +2777,31 @@ struct LEX: public Query_tables_list
 
   int print_explain(select_result_sink *output, uint8 explain_flags,
                     bool *printed_anything);
+
+  /*
+    Run specified phases for derived tables/views in the given list
+
+    @param table_list - list of derived tables/view to handle
+    @param phase      - phases to process tables/views through
+
+    @details
+    This method runs phases specified by the 'phases' on derived
+    tables/views found in the 'table_list' with help of the
+    TABLE_LIST::handle_derived function.
+    'this' is passed as an argument to the TABLE_LIST::handle_derived.
+
+    @return false -  ok
+    @return true  -  error
+  */
+  bool handle_list_of_derived(TABLE_LIST *table_list, uint phases)
+  {
+    for (TABLE_LIST *tl= table_list; tl; tl= tl->next_local)
+    {
+      if (tl->is_view_or_derived() && tl->handle_derived(this, phases))
+        return true;
+    }
+    return false;
+  }
 };