ERROR 1105 (HY000): runtime error: index out of range [0] with length 0

[jackysp]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table if not exists ast (i varchar(20));
create table if not exists acc (j varchar(20), k varchar(20), l varchar(20), m varchar(20));

explain with t as(
select i,
    (case
        when b.j = '20001' then b.l
        else b.k
    end) an
from
    ast a
inner join acc b on
(a.i = b.m)
and a.i = 'astp2019121731703151'),
t1 as (select i, group_concat(an order by an separator '; ') an from t group by i)
select * from t1;

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

No error.

3. What did you see instead (Required)

Panicked.

4. What is your TiDB version? (Required)

= v6.5.3
Actually panic starts from v6.5.6, it returns an error [2024/01/02 20:39:19.509 +08:00] [WARN] [session.go:2207] ["compile SQL failed"] [conn=2199023255955] [error="Can't find column Column#31 in schema Column: [test.ast.i,test.acc.j,test.acc.k,test.acc.l] Unique key: []"] [SQL="explain with t as(\nselect i,\n (case\n when b.j = '20001' then b.l\n else b.k\n end) an\nfrom\n ast a\ninner join acc b on\n(a.i = b.m)\nand a.i = 'astp2019121731703151'),\nt1 as (select i, group_concat(an order by an separator '; ') an from t group by i)\nselect * from t1"] on v6.5.3

[kennedy8312]

/type regression

[kennedy8312]

Regression Analysis
PR caused this regression: 46419