planner: fix unique key get wrong row count when to query the NULL value | tidb-test=2eb0d03843bfec7539602dada4f96ea2ee982c0e

[hawkingrei]

…(#56117)

What problem does this PR solve?

Issue Number: close #56116

Problem Summary:

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]

[LGTM Timeline notifier]

Timeline:

• 2024-09-27 07:40:09.144617771 +0000 UTC m=+1810878.885041704: ☑️ agreed by winoros.
• 2024-09-27 07:40:55.775333609 +0000 UTC m=+1810925.515757548: ☑️ agreed by qw4990.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.3-20240927-v8.3.0@1a0c3ac). Learn more about missing BASE report.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             release-8.3-20240927-v8.3.0     #56369   +/-   ##
================================================================
  Coverage                               ?   74.8206%           
================================================================
  Files                                  ?       1576           
  Lines                                  ?     440678           
  Branches                               ?          0           
================================================================
  Hits                                   ?     329718           
  Misses                                 ?      90786           
  Partials                               ?      20174           

Flag	Coverage Δ
integration	49.1758% <75.0000%> (?)
unit	71.9039% <75.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9567% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.5262% <0.0000%> (?)

[hawkingrei]

/retest

[hawkingrei]

/retest

[hawkingrei]

/retest

[purelind]

/test mysql-test

[tiprow]

@purelind: No presubmit jobs available for pingcap/tidb@release-8.3-20240927-v8.3.0

In response to this:

/test mysql-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qw4990

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