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Fixed bug #26661: crash when order by clause in a union

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construct references invalid name.
Derived tables currently cannot use outer references.
Thus there is no outer context for them.
The 4.1 code takes this fact into account while the 
Item_field::fix_outer_field code of 5.0 lost the check that blocks
any attempts to resolve names in outer context for derived tables.


mysql-test/r/union.result:
  Added a test case for bug #26661.
mysql-test/t/union.test:
  Added a test case for bug #26661.
sql/item.cc:
  Fixed bug #26661.
  Derived tables currently cannot use outer references.
  Thus there is no outer context for them.
  The 4.1 code takes this fact into account while the 
  Item_field::fix_outer_field code of 5.0 lost the check that blocks
  any attempts to resolve names in outer context for derived tables.
This commit is contained in:
unknown 2007-03-09 01:45:32 -08:00
commit 729bcaf430
3 changed files with 30 additions and 1 deletions
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7
sql/item.cc
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@ -3441,7 +3441,12 @@ Item_field::fix_outer_field(THD *thd, Field **from_field, Item **reference)
*/
Name_resolution_context *last_checked_context= context;
Item **ref= (Item **) not_found_item;
Name_resolution_context *outer_context= context->outer_context;
SELECT_LEX *current_sel= (SELECT_LEX *) thd->lex->current_select;
Name_resolution_context *outer_context= 0;
/* Currently derived tables cannot be correlated */
if (current_sel->master_unit()->first_select()->linkage !=
DERIVED_TABLE_TYPE)
outer_context= context->outer_context;
for (;
outer_context;
outer_context= outer_context->outer_context)