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planner: don't decorrelate the APPLY when the inner's projection reference no column (#32370) #32571

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@ti-srebot ti-srebot commented Feb 23, 2022

cherry-pick #32370 to release-4.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/32571

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/32571:release-4.0-991132080f69

…rences no column

What problem does this PR solve?

Issue Number: close #32089

Problem Summary:

When APPLY is left outer join and the inner child is projection without any reference to its child. We cannot decorrelate such APPLY for now. Since the evaluation of the constant expression would be different before and after the decorrelation.

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No code

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

None

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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@ti-chi-bot ti-chi-bot added do-not-merge/cherry-pick-not-approved do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. labels Feb 23, 2022
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/run-all-tests

@ti-chi-bot ti-chi-bot added release-note-none Denotes a PR that doesn't merit a release note. and removed do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. labels Feb 23, 2022
@ti-srebot ti-srebot added sig/planner SIG: Planner size/S Denotes a PR that changes 10-29 lines, ignoring generated files. type/4.0-cherry-pick type/bugfix This PR fixes a bug. labels Feb 23, 2022
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@winoros you're already a collaborator in bot's repo.

@ti-chi-bot ti-chi-bot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Feb 23, 2022
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xhebox commented Aug 30, 2022

close for DMR version

@xhebox xhebox closed this Aug 30, 2022
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4 participants