TiKV server timeout

[ChenPeng2013]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

tiup deploy a cluster

use test;
source [test.txt](https://github.com/pingcap/tidb/files/8338139/test.txt);

select col1, instr(col1, substr(col1, 3)) from PK_RCP9283 where instr(col1, substr(col1, 3)) >= instr("轜廞豑悒笡ç梎尠理襟", substr("轜廞豑悒笡ç梎尠理襟", 3));

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

3. What did you see instead (Required)

mysql> select col1, instr(col1, substr(col1, 3)) from PK_RCP9283 where instr(col1, substr(col1, 3)) >= instr("轜廞豑悒笡ç梎尠理襟", substr("轜廞豑悒笡ç梎尠理襟", 3));
ERROR 9002 (HY000): TiKV server timeout

4. What is your TiDB version? (Required)

Release Version: v6.1.0-alpha
Edition: Community
Git Commit Hash: 6d01855856aac61e0829f73ed8a47be6add45321
Git Branch: heads/refs/tags/v6.1.0-alpha
UTC Build Time: 2022-03-23 14:59:02
GoVersion: go1.18
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false

[ChenPeng2013]

instr function pushed down to tikv #32193