planner: Use dual plan when comparing with null values | tidb-test=pr/2328

[King-Dylan]

What problem does this PR solve?

Issue Number: close #51446

Problem Summary:
When comparing with null values in SQL, the result set will always be empty, so we can replace the execution plan with 'tabledual'.

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]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

Hi @King-Dylan. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[tiprow]

Hi @King-Dylan. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[hawkingrei]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.6234%. Comparing base (97d4705) to head (aba1089).
Report is 30 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #53206        +/-   ##
================================================
+ Coverage   72.4761%   74.6234%   +2.1473%     
================================================
  Files          1491       1493         +2     
  Lines        429017     435355      +6338     
================================================
+ Hits         310935     324877     +13942     
+ Misses        98866      90515      -8351     
- Partials      19216      19963       +747     

Flag	Coverage Δ
integration	49.2083% <100.0000%> (?)
unit	71.2366% <85.0000%> (-0.1317%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	50.2074% <ø> (+8.7638%)	⬆️

[King-Dylan]

/retest

[King-Dylan]

/retest

[King-Dylan]

/test mysql-test

[tiprow]

@King-Dylan: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test fast_test_tiprow
• /test tidb_parser_test

Use /test all to run all jobs.

In response to this:

/test mysql-test

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[ti-chi-bot]

@King-Dylan: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/mysql-test	aba1089	link	true	/test mysql-test

Full PR test history. Your PR dashboard.

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