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Allowing NULL values in UNION's with first SELECT having only NOT NULL

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columns.
This commit is contained in:
unknown 2003-02-22 17:02:36 +02:00
parent 7cef5e9b97
commit 72065f34e6
3 changed files with 48 additions and 1 deletions
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27
mysql-test/r/union.result
View file

@ -203,3 +203,30 @@ No tables used
select 1 as a,(select a union select a);
a (select a union select a)
1 1
drop table if exists t1,t2;
CREATE TABLE t1 ( id int(3) unsigned default '0') TYPE=MyISAM;
INSERT INTO t1 (id) VALUES("1");
CREATE TABLE t2 ( id int(3) unsigned default '0', id_master int(5) default '0', text1 varchar(5) default NULL, text2 varchar(5) default NULL) TYPE=MyISAM;
INSERT INTO t2 (id, id_master, text1, text2) VALUES("1", "1",
"foo1", "bar1");
INSERT INTO t2 (id, id_master, text1, text2) VALUES("2", "1",
"foo2", "bar2");
INSERT INTO t2 (id, id_master, text1, text2) VALUES("3", "1", NULL,
"bar3");
INSERT INTO t2 (id, id_master, text1, text2) VALUES("4", "1",
"foo4", "bar4");
SELECT 1 AS id_master, 1 AS id, NULL AS text1, 'ABCDE' AS text2 UNION SELECT id_master, t2.id, text1, text2 FROM t1 LEFT JOIN t2 ON t1.id = t2.id_master;
id_master id text1 text2
1 1 NULL ABCDE
1 1 bar1
1 2 bar2
1 3 NULL bar3
1 4 bar4
SELECT 1 AS id_master, 1 AS id, 'ABCDE' AS text1, 'ABCDE' AS text2 UNION SELECT id_master, t2.id, text1, text2 FROM t1 LEFT JOIN t2 ON t1.id = t2.id_master;
id_master id text1 text2
1 1 ABCDE ABCDE
1 1 foo1 bar1
1 2 foo2 bar2
1 3 NULL bar3
1 4 foo4 bar4
drop table if exists t1,t2;

17
mysql-test/t/union.test
View file

@ -107,3 +107,20 @@ drop table t1,t2;
--error 1096
select * union select 1;
select 1 as a,(select a union select a);
--disable_warnings
drop table if exists t1,t2;
--enable_warnings
CREATE TABLE t1 ( id int(3) unsigned default '0') TYPE=MyISAM;
INSERT INTO t1 (id) VALUES("1");
CREATE TABLE t2 ( id int(3) unsigned default '0', id_master int(5) default '0', text1 varchar(5) default NULL, text2 varchar(5) default NULL) TYPE=MyISAM;
INSERT INTO t2 (id, id_master, text1, text2) VALUES("1", "1",
"foo1", "bar1");
INSERT INTO t2 (id, id_master, text1, text2) VALUES("2", "1",
"foo2", "bar2");
INSERT INTO t2 (id, id_master, text1, text2) VALUES("3", "1", NULL,
"bar3");
INSERT INTO t2 (id, id_master, text1, text2) VALUES("4", "1",
"foo4", "bar4");
SELECT 1 AS id_master, 1 AS id, NULL AS text1, 'ABCDE' AS text2 UNION SELECT id_master, t2.id, text1, text2 FROM t1 LEFT JOIN t2 ON t1.id = t2.id_master;
SELECT 1 AS id_master, 1 AS id, 'ABCDE' AS text1, 'ABCDE' AS text2 UNION SELECT id_master, t2.id, text1, text2 FROM t1 LEFT JOIN t2 ON t1.id = t2.id_master;
drop table if exists t1,t2;

5
sql/sql_union.cc
View file

@ -146,7 +146,10 @@ int st_select_lex_unit::prepare(THD *thd, select_result *result,
if (setup_tables(first_table) ||
setup_wild(thd, first_table, sl->item_list, 0, sl->with_wild))
goto err;
List_iterator<Item> it(sl->item_list);
Item *item;
while((item=it++))
item->maybe_null=1;
item_list= sl->item_list;
sl->with_wild= 0;
if (setup_ref_array(thd, &sl->ref_pointer_array,