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MDEV-30706 Different results of selects from view and CTE with same definition

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MDEV-30668 Set function aggregated in outer select used in view definition

This patch fixes two bugs concerning views whose specifications contain
subqueries with set functions aggregated in outer selects.
Due to the first bug those such views that have implicit grouping were
considered as mergeable. This led to wrong result sets for selects from
these views.
Due to the second bug the aggregation select was determined incorrectly and
this led to bogus error messages.
The patch added several test cases for these two bugs and for four other
duplicate bugs.
The patch also enables view-protocol for many other test cases.

Approved by Oleksandr Byelkin <sanja@mariadb.com>
This commit is contained in:
Igor Babaev
2023-03-01 22:49:27 -08:00
parent a6a906d766
commit ccec9b1de9
23 changed files with 2021 additions and 722 deletions
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215
mysql-test/main/subselect.test
View File

@ -74,13 +74,13 @@ SELECT ROW(1,2,3) > (SELECT 1,2,1);
#enable after fix MDEV-28585
--disable_view_protocol
SELECT ROW(1,2,3) = (SELECT 1,2,NULL);
SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'a');
SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'b');
SELECT (SELECT 1.5,2,'a') = ROW('1.5b',2,'b');
SELECT (SELECT 'b',2,'a') = ROW(1.5,2,'a');
SELECT (SELECT 1.5,2,'a') = ROW(1.5,'2','a');
SELECT (SELECT 1.5,'c','a') = ROW(1.5,2,'a');
--enable_view_protocol
SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'a') AS m;
SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'b') AS m;
SELECT (SELECT 1.5,2,'a') = ROW('1.5b',2,'b') AS m;
SELECT (SELECT 'b',2,'a') = ROW(1.5,2,'a') AS m;
SELECT (SELECT 1.5,2,'a') = ROW(1.5,'2','a') AS m;
SELECT (SELECT 1.5,'c','a') = ROW(1.5,2,'a') AS m;
-- error ER_OPERAND_COLUMNS
SELECT (SELECT * FROM (SELECT 'test' a,'test' b) a);
@ -118,11 +118,15 @@ set optimizer_switch=@tmp_optimizer_switch;
select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a > t1.a) order by 1 desc limit 1);
select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a < t1.a) order by 1 desc limit 1);
#enable afte fix MDEV-27871
--disable_view_protocol
select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
explain extended select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
--enable_view_protocol
select
b,
(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) as m
from t4;
explain extended
select
b,
(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) as m
from t4;
select * from t3 where exists (select * from t2 where t2.b=t3.a);
select * from t3 where not exists (select * from t2 where t2.b=t3.a);
select * from t3 where a in (select b from t2);
@ -155,16 +159,25 @@ delete from t2 where a=2 and b=10;
select b,max(a) as ma from t4 group by b having b >= (select max(t2.a) from t2 where t2.b=t4.b);
create table t5 (a int);
#enable afte fix MDEV-27871
--disable_view_protocol
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
select
(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) as m,
a
from t2;
insert into t5 values (5);
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
select
(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) as m,
a
from t2;
insert into t5 values (2);
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
explain extended select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
--enable_view_protocol
select
(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) as m,
a
from t2;
explain extended
select
(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) as m,
a
from t2;
-- error ER_SUBQUERY_NO_1_ROW
select (select a from t1 where t1.a=t2.a union all select a from t5 where t5.a=t2.a), a from t2;
@ -269,19 +282,19 @@ SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic HAVING t
SELECT * from t2 where topic = any (SELECT SUM(topic) FROM t1);
SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic);
SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100);
#enable after fix MDEV-27871
--disable_view_protocol
SELECT *, topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100) from t2;
--enable_view_protocol
SELECT
*,
topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100) AS m
FROM t2;
SELECT * from t2 where topic = all (SELECT SUM(topic) FROM t2);
SELECT * from t2 where topic <> any (SELECT SUM(topic) FROM t2);
SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
#enable after fix MDEV-27871
--disable_view_protocol
SELECT *, topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000) from t2;
--enable_view_protocol
SELECT
*,
topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000) AS m
FROM t2;
drop table t1,t2;
#forumconthardwarefr7
@ -523,11 +536,20 @@ select 10.5 IN (SELECT * from t1);
select 1.5 > ALL (SELECT * from t1);
select 10.5 > ALL (SELECT * from t1);
select 1.5 > ANY (SELECT * from t1);
update t1 set a=NULL where a=2.5;
select 1.5 IN (SELECT * from t1);
select 3.5 IN (SELECT * from t1);
select 10.5 IN (SELECT * from t1);
select 1.5 > ALL (SELECT * from t1);
select 10.5 > ALL (SELECT * from t1);
select 1.5 > ANY (SELECT * from t1);
select 10.5 > ANY (SELECT * from t1);
--enable_view_protocol
explain extended select (select a+1) from t1;
explain extended select (select a+1) from t1;
explain extended select (select a+1) from t1;
select (select a+1) from t1;
drop table t1;
--enable_view_protocol
#
# Null with keys
@ -947,10 +969,7 @@ create table t3 (a int, b int);
insert into t1 values (0,100),(1,2), (1,3), (2,2), (2,7), (2,-1), (3,10);
insert into t2 values (0,0), (1,1), (2,1), (3,1), (4,1);
insert into t3 values (3,3), (2,2), (1,1);
#enable after fix MDEV-27871
--disable_view_protocol
select a,(select count(distinct t1.b) as sum from t1,t2 where t1.a=t2.a and t2.b > 0 and t1.a <= t3.b group by t1.a order by sum limit 1) from t3;
--enable_view_protocol
select a,(select count(distinct t1.b) as sum from t1,t2 where t1.a=t2.a and t2.b > 0 and t1.a <= t3.b group by t1.a order by sum limit 1) as m from t3;
drop table t1,t2,t3;
#
@ -1068,10 +1087,7 @@ CREATE TABLE `t3` (`taskgenid` mediumint(9) NOT NULL auto_increment,`dbid` int(1
INSERT INTO `t3` (`taskgenid`, `dbid`, `taskid`, `mon`, `tues`,`wed`, `thur`, `fri`, `sat`, `sun`, `how_often`, `userid`, `active`) VALUES (1,-1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1);
CREATE TABLE `t4` (`task_id` smallint(6) NOT NULL default '0',`description` varchar(200) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
INSERT INTO `t4` (`task_id`, `description`) VALUES (1, 'Daily Check List'),(2, 'Weekly Status');
#enable after fix MDEV-27871
--disable_view_protocol
select dbid, name, (date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01') from t3 a, t2 b, t4 WHERE dbid = - 1 AND primary_uid = '1' AND t4.task_id = taskid;
--enable_view_protocol
select dbid, name, (date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') as m FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01') as m from t3 a, t2 b, t4 WHERE dbid = - 1 AND primary_uid = '1' AND t4.task_id = taskid;
SELECT dbid, name FROM t3 a, t2 b, t4 WHERE dbid = - 1 AND primary_uid = '1' AND ((date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01')) AND t4.task_id = taskid;
drop table t1,t2,t3,t4;
@ -2390,9 +2406,6 @@ SELECT a, MAX(b), MIN(b) FROM t1 GROUP BY a;
SELECT * FROM t2;
SELECT * FROM t3;
#enable after fix MDEV-28570
--disable_view_protocol
SELECT a FROM t1 GROUP BY a
HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20);
SELECT a FROM t1 GROUP BY a
@ -2457,8 +2470,6 @@ SELECT t1.a, SUM(b) AS sum FROM t1 GROUP BY t1.a
HAVING t1.a IN (SELECT t2.c FROM t2 GROUP BY t2.c
HAVING t2.c+sum > 20);
--enable_view_protocol
DROP TABLE t1,t2,t3;
@ -2689,19 +2700,17 @@ DROP TABLE t1;
# Bug#21540 Subqueries with no from and aggregate functions return
# wrong results
#enable after fix MDEV-27871, MDEV-28573
--disable_view_protocol
CREATE TABLE t1 (a INT, b INT);
CREATE TABLE t2 (a INT);
INSERT INTO t2 values (1);
INSERT INTO t1 VALUES (1,1),(1,2),(2,3),(3,4);
SELECT (SELECT COUNT(DISTINCT t1.b) from t2) FROM t1 GROUP BY t1.a;
SELECT (SELECT COUNT(DISTINCT t1.b) from t2 union select 1 from t2 where 12 < 3)
SELECT
(SELECT COUNT(DISTINCT t1.b) from t2 union select 1 from t2 where 12 < 3) AS m
FROM t1 GROUP BY t1.a;
SELECT COUNT(DISTINCT t1.b), (SELECT COUNT(DISTINCT t1.b)) FROM t1 GROUP BY t1.a;
SELECT COUNT(DISTINCT t1.b),
(SELECT COUNT(DISTINCT t1.b) union select 1 from DUAL where 12 < 3)
(SELECT COUNT(DISTINCT t1.b) union select 1 from DUAL where 12 < 3) AS m
FROM t1 GROUP BY t1.a;
SELECT (
SELECT (
@ -2715,11 +2724,10 @@ SELECT (
SELECT COUNT(DISTINCT t1.b)
)
)
FROM t1 GROUP BY t1.a LIMIT 1)
FROM t1 GROUP BY t1.a LIMIT 1) AS m
FROM t1 t2
GROUP BY t2.a;
DROP TABLE t1,t2;
--enable_view_protocol
#
# Bug#21727 Correlated subquery that requires filesort:
@ -2954,8 +2962,6 @@ DROP TABLE t1,t2;
# Bug#27229 GROUP_CONCAT in subselect with COUNT() as an argument
#
#enable after fix MDEV-28571
--disable_view_protocol
CREATE TABLE t1 (a int, b int);
CREATE TABLE t2 (m int, n int);
INSERT INTO t1 VALUES (2,2), (2,2), (3,3), (3,3), (3,3), (4,4);
@ -2970,7 +2976,6 @@ SELECT COUNT(*) c, a,
FROM t1 GROUP BY a;
DROP table t1,t2;
--enable_view_protocol
#
# Bug#27321 Wrong subquery result in a grouping select
@ -3001,14 +3006,11 @@ SELECT tt.a,
FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test
FROM t1 as tt GROUP BY tt.a;
#enable after fix MDEV-28571
--disable_view_protocol
SELECT tt.a, MAX(
(SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
LIMIT 1)
FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1)) as test
FROM t1 as tt GROUP BY tt.a;
--enable_view_protocol
DROP TABLE t1;
@ -3163,8 +3165,6 @@ CREATE TABLE t2 (x INTEGER);
INSERT INTO t1 VALUES (1,11), (2,22), (2,22);
INSERT INTO t2 VALUES (1), (2);
#enable after fix MDEV-28573
--disable_view_protocol
# wasn't failing, but should
--error ER_SUBQUERY_NO_1_ROW
SELECT a, COUNT(b), (SELECT COUNT(b) FROM t2) FROM t1 GROUP BY a;
@ -3174,7 +3174,6 @@ SELECT a, COUNT(b), (SELECT COUNT(b) FROM t2) FROM t1 GROUP BY a;
SELECT a, COUNT(b), (SELECT COUNT(b)+0 FROM t2) FROM t1 GROUP BY a;
SELECT (SELECT SUM(t1.a)/AVG(t2.x) FROM t2) FROM t1;
--enable_view_protocol
DROP TABLE t1,t2;
@ -3189,8 +3188,6 @@ GROUP BY a1.a;
DROP TABLE t1;
#test cases from 29297
#enable after fix MDEV-28573
--disable_view_protocol
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (a INT);
INSERT INTO t1 VALUES (1),(2);
@ -3200,7 +3197,6 @@ SELECT (SELECT SUM(t1.a) FROM t2 WHERE a=0) FROM t1;
SELECT (SELECT SUM(t1.a) FROM t2 WHERE a!=0) FROM t1;
SELECT (SELECT SUM(t1.a) FROM t2 WHERE a=1) FROM t1;
DROP TABLE t1,t2;
--enable_view_protocol
#
# Bug#31884 Assertion + crash in subquery in the SELECT clause.
@ -5402,14 +5398,11 @@ INSERT INTO t2 VALUES (10,7,0), (0,7,0);
CREATE TABLE t3 (a int, b int);
INSERT INTO t3 VALUES (10,7), (0,7);
#enable after fix MDEV-27871
--disable_view_protocol
SELECT SUM(DISTINCT b),
(SELECT t2.a FROM t1 JOIN t2 ON t2.c != 0
WHERE t.a != 0 AND t2.a != 0)
WHERE t.a != 0 AND t2.a != 0) AS m
FROM (SELECT * FROM t3) AS t
GROUP BY 2;
--enable_view_protocol
SELECT SUM(DISTINCT b),
(SELECT t2.a FROM t1,t2 WHERE t.a != 0 or 1=2 LIMIT 1)
@ -5567,29 +5560,53 @@ INSERT INTO t3 VALUES (1,1),(2,2);
set @old_optimizer_switch = @@session.optimizer_switch;
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,semijoin=off';
#enable after fix MDEV-27871
--disable_view_protocol
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
SELECT
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) AS m;
SELECT
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) AS m;
set @@session.optimizer_switch=@old_optimizer_switch;
# check different IN with default switches
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
--enable_view_protocol
SELECT
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) AS m;
SELECT
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2 AS m;
SELECT
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) AS m
FROM t2;
SELECT
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) AS m;
# other row operation with NULL single row subquery also should work
select (null, null) = (null, null);
@ -5629,10 +5646,9 @@ INSERT INTO t3 VALUES (4),(5);
SET optimizer_switch='subquery_cache=off';
#enable after fix MDEV-27871
--disable_view_protocol
SELECT ( SELECT b FROM t2 WHERE b = a OR EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
--enable_view_protocol
SELECT
( SELECT b FROM t2 WHERE b = a OR EXISTS ( SELECT c FROM t3 WHERE c = b ) ) AS m
FROM t1;
# This query just for example, it should return the same as above (1 and NULL)
SELECT ( SELECT b FROM t2 WHERE b = a OR b * 0) FROM t1;
@ -5821,15 +5837,17 @@ INSERT INTO t3 VALUES (8),(3);
set @@expensive_subquery_limit= 0;
#enable after fix MDEV-27871
--disable_view_protocol
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
SELECT
(SELECT MIN(b) FROM t1, t2
WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3))) AS m
FROM t2 alias1, t1 alias2, t1 alias3;
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
SELECT
(SELECT MIN(b) FROM t1, t2
WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3))) AS m
FROM t2 alias1, t1 alias2, t1 alias3;
show status like "subquery_cache%";
@ -5838,17 +5856,20 @@ show status like '%Handler_read%';
set @@expensive_subquery_limit= default;
EXPLAIN
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
SELECT
(SELECT MIN(b) FROM t1, t2
WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3))) AS m
FROM t2 alias1, t1 alias2, t1 alias3;
flush status;
SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
SELECT
(SELECT MIN(b) FROM t1, t2
WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3))) AS m
FROM t2 alias1, t1 alias2, t1 alias3;
show status like "subquery_cache%";
show status like '%Handler_read%';
--enable_view_protocol
drop table t1, t2, t3;
@ -6102,22 +6123,16 @@ INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (f2 int);
INSERT INTO t2 VALUES (3);
#enable after fix MDEV-29224
--disable_view_protocol
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
--enable_view_protocol
INSERT INTO t2 VALUES (4);
#enable after fix MDEV-28573
--disable_view_protocol
--error ER_SUBQUERY_NO_1_ROW
SELECT ( SELECT MAX(f1) FROM t2 ) FROM v1;
--error ER_SUBQUERY_NO_1_ROW
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
--enable_view_protocol
drop view v1;
drop table t1,t2;