["unexpected Flen value(-1) in CONCAT's args"] ["arg's index"=0] warning when select

[zhangyangyu]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

select concat(@@sql_mode,',STRICT_TRANS_TABLES');

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

everything works right

3. What did you see instead (Required)

warning as the title in log file

4. What is your TiDB version? (Required)

Release Version: v5.2.2
Edition: Community
Git Commit Hash: da1c21f
Git Branch: heads/refs/tags/v5.2.2
UTC Build Time: 2021-10-20 06:03:29
GoVersion: go1.16.4
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306+
Check Table Before Drop: false

[github-actions]

Please check whether the issue should be labeled with 'affects-x.y' or 'fixes-x.y.z', and then remove 'needs-more-info' label.

[zhangyangyu]

/remove-label needs-more-info

[zhangyangyu]

@XuHuaiyu thanks for the action but could you please elaborate why wonfix although there are many warnings in the log?

[github-actions]

Please check whether the issue should be labeled with 'affects-x.y' or 'fixes-x.y.z', and then remove 'needs-more-info' label.