Got nil pointer error when multiple Apply is used with CTE

[guo-shaoge]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

drop table if exists t1;
create table t1(a int);
insert into t1 values(1), (2);
SELECT * FROM t1 dt WHERE EXISTS( WITH RECURSIVE qn AS (SELECT a AS b UNION ALL SELECT b+1 FROM qn WHERE b=0 or b = 1) SELECT * FROM qn dtqn1 where exists (select /*+ NO_DECORRELATE() */ b from qn where dtqn1.b+1));

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

runs ok

3. What did you see instead (Required)

ERROR 1105 (HY000): runtime error: invalid memory address or nil pointer dereference

4. What is your TiDB version? (Required)

MySQL [test]> select tidb_version();
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version()                                                                                                                                                                                                                                                           |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v7.2.0-alpha-467-g9696d8f7c3
Edition: Community
Git Commit Hash: 9696d8f7c3dffac156764d4f2b127bdc755a499b
Git Branch: master
UTC Build Time: 2023-06-19 08:15:44
GoVersion: go1.20.1
Race Enabled: false
Check Table Before Drop: false
Store: unistore |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.001 sec)