Batch Point Get doesn't use converted datum

[Ryan-Git]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

CREATE TABLE `t` (`tenant_id` bigint(20) NOT NULL DEFAULT '0',`order_id` bigint(20) NOT NULL DEFAULT '0',UNIQUE KEY `uk_ten_ord` (`order_id`, `tenant_id`))  PARTITION BY HASH(`tenant_id`) PARTITIONS 32;

INSERT INTO t(tenant_id, order_id) VALUES (123, 456);

DELETE FROM t where (tenant_id, order_id) in (('123','456'));

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

affected rows 1

3. What did you see instead (Required)

affected rows 0

4. What is your TiDB version? (Required)

up to 7.5.0, master the same I think

in #26713, cases of ValueExpr and ParamMarkerExpr are handled(use converted int datum instead of origin string one), but the RowExpr is left unchanged, which causes this problem.

Is it intentional?

[Defined2014]

It's been fixed by #49161 and only affects v7.5.x and previous version.