Tikv conv function inconsistent results with tidb #51877
Description
Bug Report
Please answer these questions before submitting your issue. Thanks!
1. Minimal reproduce step (Required)
set tidb_opt_projection_push_down = 'on';
create table bug15583(b BIT(8), n INT);
insert into bug15583 values(128, 128);
insert into bug15583 values(null, null);
insert into bug15583 values(0, 0);
insert into bug15583 values(255, 255);
select conv(b, 10, 2), conv(b + 0, 10, 2) from bug15583;
2. What did you expect to see? (Required)
conv(b, 10, 2) conv(b + 0, 10, 2)
10000000 10000000
NULL NULL
0 0
11111111 11111111
3. What did you see instead (Required)
conv(b, 10, 2) conv(b + 0, 10, 2)
0 10000000
NULL NULL
0 0
0 11111111
4. What is your TiDB version? (Required)
| Release Version: v7.4.0-alpha-2012-gfe01d11df6-dirty
Edition: Community
Git Commit Hash: fe01d11
Git Branch: div_increase_prec
UTC Build Time: 2024-03-15 08:10:07