partition: set AddRecordOpt.isUpdate = true when update partition records (#57590)

[ti-chi-bot]

This is an automated cherry-pick of #57590

What problem does this PR solve?

Issue Number: close #57588

Problem Summary:

Didn't set isUpdate = true before, so it will use the last value in datum as _tidb_rowid which caused primary key duplicate.

If we don't do this during add columns, len(r) == len(cols) always equal to true, so it's safe.

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

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Defined2014
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-22 04:21:53.733709062 +0000 UTC m=+178301.353363599: ☑️ agreed by Defined2014.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-8.5@de49db5). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #57622   +/-   ##
================================================
  Coverage               ?   56.8360%           
================================================
  Files                  ?       1770           
  Lines                  ?     626453           
  Branches               ?          0           
================================================
  Hits                   ?     356051           
  Misses                 ?     246334           
  Partials               ?      24068           

Flag	Coverage Δ
integration	36.7317% <100.0000%> (?)
unit	72.5403% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9478% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.2820% <0.0000%> (?)

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