support of subselect without FROM reducing (SCRUM)

fixed bug of calling setup_fields without correct lex->current_select pointer in mysql_derived
more correct creation of reference in Item_field::fix_field


mysql-test/r/subselect.result:
  new explain with subselect reduced
mysql-test/t/subselect.test:
  new explain with subselect reduced
sql/item.cc:
  support of subselect without FROM reducing
  more correct creation of reference in Item_field::fix_field
sql/item.h:
  support of subselect without FROM reducing
sql/item_cmpfunc.cc:
  support of subselect without FROM reducing
sql/item_cmpfunc.h:
  support of subselect without FROM reducing
sql/item_func.cc:
  support of subselect without FROM reducing
sql/item_func.h:
  support of subselect without FROM reducing
sql/item_row.cc:
  support of subselect without FROM reducing
sql/item_row.h:
  support of subselect without FROM reducing
sql/item_strfunc.h:
  fixed layout
  support of subselect without FROM reducing
sql/item_subselect.cc:
  support of subselect without FROM reducing
sql/item_subselect.h:
  support of subselect without FROM reducing
sql/mysql_priv.h:
  reference in Item_field::fix_field related changes
sql/sql_base.cc:
  reference in Item_field::fix_field related changes
sql/sql_derived.cc:
  fixed bug of calling setup_fields without correct lex->current_select pointer

1 files changed, 16 insertions, 1 deletions

diff --git a/sql/item_row.cc b/sql/item_row.cc
index 9d605e05242..b54653f4183 100644
--- a/sql/item_row.cc
+++ b/sql/item_row.cc
@@ -105,5 +105,20 @@ void Item_row::bring_value()
 {
   for (uint i= 0; i < arg_count; i++)
     items[i]->bring_value();
-  return;
+}
+
+void Item_row::set_outer_resolving()
+{
+  for (uint i= 0; i < arg_count; i++)
+    items[i]->set_outer_resolving();
+}
+
+bool Item_row::check_loop(uint id)
+{
+  if (Item::check_loop(id))
+    return 1;
+  for (uint i= 0; i < arg_count; i++)
+    if (items[i]->check_loop(id))
+      return 1;
+  return 0;
 }