From: Xiong He <iihero@qq.com>
To: pgsql-bugs <pgsql-bugs@lists.postgresql.org>
Subject: Possible wrong result with some "in" subquery with non-existing columns
Date: Tue, 17 Jan 2023 08:00:09 +0000
Message-ID: <tencent_E8F863DB3246FD47EBEE85FFF5E56B020508@qq.com> (raw)
Dear All,
This is a common scenario in below query. I just verified in the pg14.x.
mydb=# create table test1(id1 int primary key, col2 varchar(32));
CREATE TABLE
mydb=# create table test2(id2 int primary key, col2 varchar(32));
CREATE TABLE
mydb=# insert into test1 values(1, 'wang');
INSERT 0 1
mydb=# insert into test2 values(2, 'tttt');
INSERT 0 1
mydb=# select * from test1 where id1 in (select id1 from test2 where id2 = 2);
id1 | col2
-----+------
1 | wang
(1 row)
mydb=# insert into test1 values(3, 'wang');
INSERT 0 1
mydb=# select * from test1 where id1 in (select id1 from test2 where id2 = 2);
id1 | col2
-----+------
1 | wang
3 | wang
(2 rows)
In the above query: id1 is not a column of table test2.
Should not we expect this should be en error instead of it thinking it's a column from the table : test1?
Regards,
Xiong
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Cc: iihero@qq.com, pgsql-bugs@lists.postgresql.org
Subject: Re: Possible wrong result with some "in" subquery with non-existing columns
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