Get wrong result with field func and utf8mb4_general_ci in real TiKV env

[Defined2014]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

drop table if exists t;
create table t(a varchar(10) collate utf8mb4_bin, b varchar(10) collate utf8mb4_general_ci);
insert into t (a, b) values ('a', 'A');
select * from t where field('A', a collate utf8mb4_general_ci, b) > 1;

also has problem below

select * from t where field('A', a, b collate utf8mb4_general_ci) > 1;
select * from t where field('A' collate utf8mb4_general_ci, a, b) > 1;

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

mysql> select * from t where field('A', a collate utf8mb4_general_ci, b) > 1;
Empty set (0.01 sec)

3. What did you see instead (Required)

mysql> select * from t where field('A', a collate utf8mb4_general_ci, b) > 1;
+------+------+
| a    | b    |
+------+------+
| a    | A    |
+------+------+
1 row in set (0.00 sec)

4. What is your TiDB version? (Required)

mysql> SELECT tidb_version()
    -> ;
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version()                                                                                                                                                                                                                                                             |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v7.5.0-alpha
Edition: Community
Git Commit Hash: 4765838f4dc093bb2b2a16b0fd20a73e397532c6
Git Branch: heads/refs/tags/v7.5.0-alpha
UTC Build Time: 2023-10-16 14:25:07
GoVersion: go1.21.3
Race Enabled: false
Check Table Before Drop: false
Store: tikv |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

[Defined2014]

maybe #18662 only fixed TiDB part.

[aytrack]

/severity critical

[Defined2014]

Close it by tikv/tikv#15878