Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

MySQL 8.4.4

create table t1(id bigint primary key, name varchar(100));
prepare stmt from 'select name, ? from t1 group by name, ?';
set @a="0", @b="0";
execute stmt using @a, @b;

TiDB 8.5.2

create table t1(id bigint primary key nonclustered, name varchar(100));
prepare stmt from 'select name, ? from t1 group by name, ?';
show warnings;
set @a="0", @b="0";
execute stmt using @a, @b;

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

The query should behave the same as in MySQL 8.4.4:
No error should be reported, and the statement should execute successfully, returning an empty set.

3. What did you see instead (Required)

In TiDB 8.5.2, when executing execute stmt using @a, @b;, the following error occurs:

ERROR 1105 (HY000): Unknown column '0' in 'group statement'

And when preparing the statement, a warning is shown:

Warning | 1105 | skip prepared plan-cache: query has 'group by ?' is un-cacheable

4. What is your TiDB version? (Required)

select tidb_version();

Example output:

Release Version: v8.5.2
Edition: Community

Compatibility Conclusion

This SQL works fine in MySQL 8.4.4, but fails in TiDB 8.5.2.
It seems to be a compatibility issue regarding parameter placeholders in the GROUP BY clause.