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fixed error handling if creating derived table failed

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single row subquery always can return NULL (no rows found) (BUG#5590)


mysql-test/r/subselect.result:
  maybe_null flag returning by subquwery for temporary table creation
mysql-test/t/subselect.test:
  maybe_null flag returning by subquwery for temporary table creation
sql/item.cc:
  storing maybe_null in type holder
sql/item_subselect.cc:
  single row subquery always can return NULL (no rows found)
sql/sql_derived.cc:
  fixed error handling if creating derived table failed
This commit is contained in:
unknown 2004-09-17 19:08:46 +03:00
parent f177c76fb2
commit 580f12cc04
5 changed files with 30 additions and 3 deletions
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15
mysql-test/r/subselect.result
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@ -1084,7 +1084,7 @@ SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` bigint(20) NOT NULL default '0',
`(SELECT a)` bigint(20) NOT NULL default '0'
`(SELECT a)` bigint(20) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT a+0)) a;
@ -1102,7 +1102,7 @@ a
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` bigint(20) NOT NULL default '0'
`a` bigint(20) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create table t1 (a int);
@ -1976,3 +1976,14 @@ create table t1 (x int);
select (select b.x from t1 as b where b.x=a.x) from t1 as a where a.x=2 group by a.x;
(select b.x from t1 as b where b.x=a.x)
drop table t1;
CREATE TABLE `t1` ( `master` int(10) unsigned NOT NULL default '0', `map` smallint(6) unsigned NOT NULL default '0', `slave` int(10) unsigned NOT NULL default '0', `access` int(10) unsigned NOT NULL default '0', UNIQUE KEY `access_u` (`master`,`map`,`slave`));
INSERT INTO `t1` VALUES (1,0,0,700),(1,1,1,400),(1,5,5,400),(1,12,12,400),(1,12,32,400),(4,12,32,400);
CREATE TABLE `t2` ( `id` int(10) unsigned NOT NULL default '0', `pid` int(10) unsigned NOT NULL default '0', `map` smallint(6) unsigned NOT NULL default '0', `level` tinyint(4) unsigned NOT NULL default '0', `title` varchar(255) default NULL, PRIMARY KEY (`id`,`pid`,`map`), KEY `level` (`level`), KEY `id` (`id`,`map`)) ;
INSERT INTO `t2` VALUES (6,5,12,7,'a'),(12,0,0,7,'a'),(12,1,0,7,'a'),(12,5,5,7,'a'),(12,5,12,7,'a');
SELECT b.sc FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b;
ERROR 42S22: Unknown column 'b.sc' in 'field list'
SELECT b.ac FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b;
ac
700
NULL
drop tables t1,t2;

13
mysql-test/t/subselect.test
View File

@ -1270,3 +1270,16 @@ drop table t1;
create table t1 (x int);
select (select b.x from t1 as b where b.x=a.x) from t1 as a where a.x=2 group by a.x;
drop table t1;
#
# Test of correct maybe_null flag returning by subquwery for temporary table
# creation
#
CREATE TABLE `t1` ( `master` int(10) unsigned NOT NULL default '0', `map` smallint(6) unsigned NOT NULL default '0', `slave` int(10) unsigned NOT NULL default '0', `access` int(10) unsigned NOT NULL default '0', UNIQUE KEY `access_u` (`master`,`map`,`slave`));
INSERT INTO `t1` VALUES (1,0,0,700),(1,1,1,400),(1,5,5,400),(1,12,12,400),(1,12,32,400),(4,12,32,400);
CREATE TABLE `t2` ( `id` int(10) unsigned NOT NULL default '0', `pid` int(10) unsigned NOT NULL default '0', `map` smallint(6) unsigned NOT NULL default '0', `level` tinyint(4) unsigned NOT NULL default '0', `title` varchar(255) default NULL, PRIMARY KEY (`id`,`pid`,`map`), KEY `level` (`level`), KEY `id` (`id`,`map`)) ;
INSERT INTO `t2` VALUES (6,5,12,7,'a'),(12,0,0,7,'a'),(12,1,0,7,'a'),(12,5,5,7,'a'),(12,5,12,7,'a');
-- error 1054
SELECT b.sc FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b;
SELECT b.ac FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b;
drop tables t1,t2;

1
sql/item.cc
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@ -2486,6 +2486,7 @@ Item_type_holder::Item_type_holder(THD *thd, Item *item)
else
field_example= 0;
max_length= real_length(item);
maybe_null= item->maybe_null;
collation.set(item->collation);
}

1
sql/item_subselect.cc
View File

@ -401,7 +401,6 @@ void Item_singlerow_subselect::fix_length_and_dec()
engine->fix_length_and_dec(row);
value= *row;
}
maybe_null= engine->may_be_null();
}
uint Item_singlerow_subselect::cols()

3
sql/sql_derived.cc
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@ -224,7 +224,10 @@ static int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit,
}
}
else
{
free_tmp_table(thd, table);
thd->lex->unit.cleanup();
}
exit:
delete derived_result;