Sergey Glukhov 081bcb3b8b Bug#47371 reference by same column name ...

At the end of execution top level join execution
we cleanup this join with true argument.
It leads to underlying join cleanup(subquery) with true argument too
and to tmp_table_param->field array cleanup which is required later.
The problem is that Item_func_set_user_var does not set
result_filed which leads to unnecessary repeated excution of subquery
on final stage.
The fix is to set result_field for Item_func_set_user_var.


mysql-test/r/count_distinct.result:
  test result
mysql-test/r/user_var.result:
  test result
mysql-test/t/count_distinct.test:
  test case
mysql-test/t/user_var.test:
  test case
sql/item_func.cc:
  At the end of execution top level join execution
  we cleanup this join with true argument.
  It leads to underlying join cleanup(subquery) with true argument too
  and to tmp_table_param->field array cleanup which is required later.
  The problem is that Item_func_set_user_var does not set
  result_filed which leads to unnecessary repeated excution of subquery
  on final stage.
  The fix is to set result_field for Item_func_set_user_var.

2009-12-22 13:52:23 +04:00

3.6 KiB

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