1 files changed, 6 insertions, 16 deletions

diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 89a9eeb1e32..2889e1e1549 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -11857,7 +11857,7 @@ void JOIN::join_free()
 /**
   Free resources of given join.
 
-  @param fill   true if we should free all resources, call with full==1
+  @param full   true if we should free all resources, call with full==1
                 should be last, before it this function can be called with
                 full==0
 
@@ -11969,7 +11969,7 @@ void JOIN::cleanup(bool full)
     /*
       If we have tmp_join and 'this' JOIN is not tmp_join and
       tmp_table_param.copy_field's  of them are equal then we have to remove
-      pointer to  tmp_table_param.copy_field from tmp_join, because it qill
+      pointer to  tmp_table_param.copy_field from tmp_join, because it will
       be removed in tmp_table_param.cleanup().
     */
     tmp_table_param.cleanup();
@@ -15111,20 +15111,9 @@ bool cond_is_datetime_is_null(Item *cond)
   if (cond->type() == Item::FUNC_ITEM &&
       ((Item_func*) cond)->functype() == Item_func::ISNULL_FUNC)
   {
-    Item **args= ((Item_func_isnull*) cond)->arguments();
-    if (args[0]->type() == Item::FIELD_ITEM)
-    {
-      Field *field=((Item_field*) args[0])->field;
-
-      if (((field->type() == MYSQL_TYPE_DATE) ||
-           (field->type() == MYSQL_TYPE_DATETIME)) &&
-          (field->flags & NOT_NULL_FLAG))
-      {
-        return TRUE;
-      }
-    }
+    return ((Item_func_isnull*) cond)->arg_is_datetime_notnull_field();
   }
-  return FALSE;
+  return false;
 }
 
 
@@ -16082,6 +16071,7 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
   case Item::CACHE_ITEM:
   case Item::WINDOW_FUNC_ITEM: // psergey-winfunc:
   case Item::EXPR_CACHE_ITEM:
+  case Item::PARAM_ITEM:
     if (make_copy_field)
     {
       DBUG_ASSERT(((Item_result_field*)item)->result_field);
@@ -22853,7 +22843,7 @@ setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param,
  err:
   if (copy)
     delete [] param->copy_field;			// This is never 0
-  param->copy_field=0;
+  param->copy_field= 0;
 err2:
   DBUG_RETURN(TRUE);
 }