executor: handle the corner case that temp index is not exist but the normal index is exist (#51862)

[ti-chi-bot]

This is an automated cherry-pick of #51862

What problem does this PR solve?

Issue Number: close #51784

Problem Summary:
If the temp index is not exist, we need to check if the normal index is exist.
The corner case is showed in the added unit test.

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.

fix a bug may cause unique index and data inconsistent when using insert ignore

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 16 lines in your changes are missing coverage. Please review.

Please upload report for BASE (release-7.5@1e19051). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #53066   +/-   ##
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  Coverage               ?   71.9953%           
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  Files                  ?       1411           
  Lines                  ?     410364           
  Branches               ?          0           
================================================
  Hits                   ?     295443           
  Misses                 ?      95043           
  Partials               ?      19878           

Flag	Coverage Δ
unit	71.9953% <60.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9913% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.4420% <0.0000%> (?)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, zimulala

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• OWNERS [tangenta,zimulala]
• pkg/ddl/OWNERS [tangenta,zimulala]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-27 09:51:53.353266904 +0000 UTC m=+2683667.110402470: ☑️ agreed by tangenta.
• 2024-05-27 09:52:34.853908913 +0000 UTC m=+2683708.611044481: ☑️ agreed by zimulala.