an outer reference in a subquery doesn't have more scope that if it was at the place of the subquery.

[ChenPeng2013]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

use test;
drop table if exists t;
create table t(a int, b int);
insert into t values(1,10),(2,20);
select t1.* from t t0 cross join (t t1 join t t2 on 100=t0.a);

2. What did you expect to see? (Required)

MySQL [test]> select t1.* from t t0 cross join (t t1 join t t2 on 100=t0.a);
ERROR 1054 (42S22): Unknown column 't0.a' in 'on clause'

3. What did you see instead (Required)

MySQL [test]> select t1.* from t t0 cross join (t t1 join t t2 on 100=t0.a);
Empty set (0.00 sec)

4. What is your TiDB version? (Required)

Release Version: v5.4.0-alpha-636-g3a44f6d
Edition: Community
Git Commit Hash: 3a44f6da1c18c55586a1f8453af85452266d7714
Git Branch: release-5.4
UTC Build Time: 2022-01-18 01:01:40
GoVersion: go1.17.6
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false