executor: fix data race in nullmap in hash join v2

[windtalker]

What problem does this PR solve?

Issue Number: close #57450, ref #53127

Problem Summary:
In hash join v2, if the join need to set usedFlag during probe stage, there is potantial data race, this pr fix it by make nullmap length 4 byte alignment if join need usedFlag.

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]

Hi @windtalker. Thanks for your PR.

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[xzhangxian1008]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.5578%. Comparing base (0a9a231) to head (f0e567a).
Report is 4 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57451        +/-   ##
================================================
+ Coverage   72.8638%   73.5578%   +0.6939%     
================================================
  Files          1672       1672                
  Lines        462656     462799       +143     
================================================
+ Hits         337109     340425      +3316     
+ Misses       104755     101689      -3066     
+ Partials      20792      20685       -107     

Flag	Coverage Δ
integration	43.3901% <100.0000%> (?)
unit	72.3923% <100.0000%> (+0.1401%)	⬆️

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

Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	45.1164% <ø> (-0.0062%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wshwsh12, xzhangxian1008

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-18 05:27:12.76156779 +0000 UTC m=+852394.952436787: ☑️ agreed by xzhangxian1008.
• 2024-11-18 06:04:39.336900944 +0000 UTC m=+854641.527769941: ☑️ agreed by wshwsh12.

[windtalker]

/run-check-issue-triage-complete

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #57456.