Merge with MySQL 5.1.53

Open issues:
- A better fix for #57688; Igor is working on this
- Test failure in index_merge_innodb.test ; Igor promised to look at this
- Some Innodb tests fails (need to merge with latest xtradb) ; Kristian promised to look at this.
 - Failing tests: innodb_plugin.innodb_bug56143 innodb_plugin.innodb_bug56632 innodb_plugin.innodb_bug56680 innodb_plugin.innodb_bug57255 
- Werror is disabled;  Should be enabled after merge with xtradb.

1 files changed, 0 insertions, 9 deletions

diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index 3b2ef92ab48..2cedce497b6 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -173,7 +173,6 @@ bool st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
   SELECT_LEX *sl, *first_sl= first_select();
   select_result *tmp_result;
   bool is_union_select;
-  TABLE *empty_table= 0;
   DBUG_ENTER("st_select_lex_unit::prepare");
 
   describe= test(additional_options & SELECT_DESCRIBE);
@@ -275,14 +274,6 @@ bool st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
       types= first_sl->item_list;
     else if (sl == first_sl)
     {
-      /*
-        We need to create an empty table object. It is used
-        to create tmp_table fields in Item_type_holder.
-        The main reason of this is that we can't create
-        field object without table.
-      */
-      DBUG_ASSERT(!empty_table);
-      empty_table= (TABLE*) thd->calloc(sizeof(TABLE));
       types.empty();
       List_iterator_fast<Item> it(sl->item_list);
       Item *item_tmp;