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Fixed bug #27937: crash for the the second execution of a prepared

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statement from a UNION query with ORDER BY an expression containing
RAND().
The crash happened because the global order by list in the union query
was not re-initialized for execution.
(Local order by lists were re-initialized though).
This commit is contained in:
igor@olga.mysql.com 2007-05-14 16:41:09 -07:00
parent 681ef616ed
commit d71043b889
3 changed files with 45 additions and 0 deletions
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22
mysql-test/r/ps.result
View file

@ -1087,4 +1087,26 @@ t2 CREATE TABLE `t2` (
drop database mysqltest;
deallocate prepare stmt1;
deallocate prepare stmt2;
CREATE TABLE t1(a int);
INSERT INTO t1 VALUES (2), (3), (1);
PREPARE st1 FROM
'(SELECT a FROM t1) UNION (SELECT a+10 FROM t1) ORDER BY RAND()*0+a';
EXECUTE st1;
a
1
2
3
11
12
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EXECUTE st1;
a
1
2
3
11
12
13
DEALLOCATE PREPARE st1;
DROP TABLE t1;
End of 4.1 tests.

18
mysql-test/t/ps.test
View file

@ -1128,4 +1128,22 @@ drop database mysqltest;
deallocate prepare stmt1;
deallocate prepare stmt2;
#
#
# Bug #27937: crash on the second execution for prepared statement
# from UNION with ORDER BY an expression containing RAND()
#
CREATE TABLE t1(a int);
INSERT INTO t1 VALUES (2), (3), (1);
PREPARE st1 FROM
'(SELECT a FROM t1) UNION (SELECT a+10 FROM t1) ORDER BY RAND()*0+a';
EXECUTE st1;
EXECUTE st1;
DEALLOCATE PREPARE st1;
DROP TABLE t1;
--echo End of 4.1 tests.

5
sql/sql_union.cc
View file

@ -135,6 +135,11 @@ st_select_lex_unit::init_prepare_fake_select_lex(THD *thd)
fake_select_lex->table_list.link_in_list((byte *)&result_table_list,
(byte **)
&result_table_list.next);
for (ORDER *order= (ORDER *) global_parameters->order_list.first;
order;
order= order->next)
order->item= &order->item_ptr;
return options_tmp;
}