executor: fix select wrong partition for hash partition table

[Defined2014]

What problem does this PR solve?

Issue Number: close #50427

Problem Summary: Still caused by #49853, I made a mistake about mathutil.Abs and select a wrong partiton for hash partition table.

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

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[codecov]

Codecov Report

Merging #50430 (e5710ab) into master (5faf86c) will decrease coverage by 14.2794%.
Report is 11 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50430         +/-   ##
=================================================
- Coverage   70.0709%   55.7916%   -14.2794%     
=================================================
  Files          1444       1551        +107     
  Lines        420010     584982     +164972     
=================================================
+ Hits         294305     326371      +32066     
- Misses       105423     235902     +130479     
- Partials      20282      22709       +2427     

Flag	Coverage Δ
integration	36.4751% <100.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	55.1954% <ø> (+5.5222%)	⬆️

[Defined2014]

Ref https://github.com/pingcap/tidb/pull/49853/files#diff-4990f33f249ec8823358eef763ccfccd9284b58d4942eba35b7b4e22c16b1a33L193, let it same as before.

Although I think the behaviour of hash function is strange, it already works for a long time. Just change it back.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tiancaiamao, xhebox

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-15 12:54:59.663035833 +0000 UTC m=+187741.227333538: ☑️ agreed by xhebox.
• 2024-01-16 02:03:40.056607945 +0000 UTC m=+235061.620905673: ☑️ agreed by tiancaiamao.