From 0c1bdcbd2443a0e6514652aac5ba41c72882ccd0 Mon Sep 17 00:00:00 2001 From: unknown Date: Fri, 2 Nov 2007 02:36:12 +0300 Subject: [PATCH] A fix for Bug#32030 "DELETE does not return an error and deletes rows if error evaluating WHERE" DELETE with a subquery in WHERE clause would sometimes ignore subquery evaluation error and proceed with deletion. The fix is to check for an error after evaluation of the WHERE clause in DELETE. Addressed review comments. mysql-test/r/group_min_max.result: Update the test results to reflect the fix for Bug#32030. mysql-test/r/ps.result: Update test results (Bug#32030) mysql-test/t/group_min_max.test: Update the test case to reflect the fix for Bug#32030 mysql-test/t/ps.test: Add a test case for Bug#32030 sql/sql_delete.cc: Check for an error before calling send_ok(). Two different places are covered because the subquery code has slightly different execution paths depending on ps-protocol/old-protocol --- mysql-test/r/group_min_max.result | 3 +-- mysql-test/r/ps.result | 20 +++++++++++++++++++ mysql-test/t/group_min_max.test | 1 + mysql-test/t/ps.test | 33 +++++++++++++++++++++++++++++++ sql/sql_delete.cc | 11 +++++++++-- 5 files changed, 64 insertions(+), 4 deletions(-) diff --git a/mysql-test/r/group_min_max.result b/mysql-test/r/group_min_max.result index f62fd662a5d..270f248ea9c 100644 --- a/mysql-test/r/group_min_max.result +++ b/mysql-test/r/group_min_max.result @@ -2299,8 +2299,7 @@ Handler_read_next 0 FLUSH STATUS; DELETE FROM t3 WHERE (SELECT (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) x FROM t1) > 10000; -Warnings: -Error 1242 Subquery returns more than 1 row +ERROR 21000: Subquery returns more than 1 row SHOW STATUS LIKE 'handler_read__e%'; Variable_name Value Handler_read_key 8 diff --git a/mysql-test/r/ps.result b/mysql-test/r/ps.result index edac68a88d6..db9f0613d7f 100644 --- a/mysql-test/r/ps.result +++ b/mysql-test/r/ps.result @@ -2680,4 +2680,24 @@ t1 CREATE TABLE `t1` ( KEY `c` (`c`(10)) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; +drop table if exists t1, t2; +Warnings: +Note 1051 Unknown table 't1' +Note 1051 Unknown table 't2' +create table t1 (a int, b int); +create table t2 like t1; +insert into t1 (a, b) values (1,1), (1,2), (1,3), (1,4), (1,5), +(2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6); +insert into t2 select a, max(b) from t1 group by a; +prepare stmt from "delete from t2 where (select (select max(b) from t1 group +by a having a < 2) x from t1) > 10000"; +delete from t2 where (select (select max(b) from t1 group +by a having a < 2) x from t1) > 10000; +ERROR 21000: Subquery returns more than 1 row +execute stmt; +ERROR 21000: Subquery returns more than 1 row +execute stmt; +ERROR 21000: Subquery returns more than 1 row +deallocate prepare stmt; +drop table t1, t2; End of 5.1 tests. diff --git a/mysql-test/t/group_min_max.test b/mysql-test/t/group_min_max.test index cf25b4c61be..9d1e065797d 100644 --- a/mysql-test/t/group_min_max.test +++ b/mysql-test/t/group_min_max.test @@ -890,6 +890,7 @@ FLUSH STATUS; DELETE FROM t3 WHERE (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) > 10000; SHOW STATUS LIKE 'handler_read__e%'; FLUSH STATUS; +--error ER_SUBQUERY_NO_1_ROW DELETE FROM t3 WHERE (SELECT (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) x FROM t1) > 10000; SHOW STATUS LIKE 'handler_read__e%'; diff --git a/mysql-test/t/ps.test b/mysql-test/t/ps.test index dea86bdd2fa..c528fddaf93 100644 --- a/mysql-test/t/ps.test +++ b/mysql-test/t/ps.test @@ -2778,4 +2778,37 @@ execute stmt; show create table t1; drop table t1; +# +# Bug #32030 DELETE does not return an error and deletes rows if error +# evaluating WHERE +# +# Test that there is an error for prepared delete just like for the normal +# one. +# + +drop table if exists t1, t2; +create table t1 (a int, b int); +create table t2 like t1; + +insert into t1 (a, b) values (1,1), (1,2), (1,3), (1,4), (1,5), + (2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6); + +insert into t2 select a, max(b) from t1 group by a; + +prepare stmt from "delete from t2 where (select (select max(b) from t1 group +by a having a < 2) x from t1) > 10000"; + +--error ER_SUBQUERY_NO_1_ROW +delete from t2 where (select (select max(b) from t1 group +by a having a < 2) x from t1) > 10000; +--error ER_SUBQUERY_NO_1_ROW +execute stmt; +--error ER_SUBQUERY_NO_1_ROW +execute stmt; + +deallocate prepare stmt; +drop table t1, t2; + + + --echo End of 5.1 tests. diff --git a/sql/sql_delete.cc b/sql/sql_delete.cc index 219dc90429b..f183cb3142f 100644 --- a/sql/sql_delete.cc +++ b/sql/sql_delete.cc @@ -35,6 +35,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, READ_RECORD info; bool using_limit=limit != HA_POS_ERROR; bool transactional_table, safe_update, const_cond; + bool const_cond_result; ha_rows deleted= 0; uint usable_index= MAX_KEY; SELECT_LEX *select_lex= &thd->lex->select_lex; @@ -86,6 +87,12 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, select_lex->no_error= thd->lex->ignore; + const_cond_result= const_cond && (!conds || conds->val_int()); + if (thd->is_error()) + { + /* Error evaluating val_int(). */ + DBUG_RETURN(TRUE); + } /* Test if the user wants to delete all rows and deletion doesn't have any side-effects (because of triggers), so we can use optimized @@ -105,7 +112,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, - We should not be binlogging this statement row-based, and - there should be no delete triggers associated with the table. */ - if (!using_limit && const_cond && (!conds || conds->val_int()) && + if (!using_limit && const_cond_result && !(specialflag & (SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE)) && (thd->lex->sql_command == SQLCOM_TRUNCATE || (!thd->current_stmt_binlog_row_based && @@ -300,7 +307,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, else table->file->unlock_row(); // Row failed selection, release lock on it } - if (thd->killed && !error) + if (thd->killed || thd->is_error()) error= 1; // Aborted if (will_batch && (loc_error= table->file->end_bulk_delete())) {