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expression, cmd: fix ColumnSubstitute and allow some cases to substitute (#38826) #40914

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expression, cmd: fix ColumnSubstitute and allow some cases to substitute (#38826) #40914

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This is an automated cherry-pick of #38826

Signed-off-by: wjhuang2016 huangwenjun1997@gmail.com

What problem does this PR solve?

Issue Number: close #38736 and close #40536

Problem Summary:
Take the case from #38736,
the first argument's collation in the like function is utf8mb4_bin, and the second is binary.
So we can't substitute the first argument(utf8mb4_bin to utf8mb4_bin) since it is weakened than binary.
If the collation and coercibility don't change, it's safe to substitute.

What is changed and how it works?

If the collation and coercibility don't change, it's safe to substitute.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

@wjhuang2016 @ti-chi-bot
This is an automated cherry-pick of pingcap#38826
a926d10 
Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>
@ti-chi-bot ti-chi-bot mentioned this pull request Jan 31, 2023
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@ti-chi-bot ti-chi-bot added release-note-none Denotes a PR that doesn't merit a release note. do-not-merge/cherry-pick-not-approved size/L Denotes a PR that changes 100-499 lines, ignoring generated files. type/cherry-pick-for-release-5.3 labels Jan 31, 2023
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@ti-chi-bot: 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.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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/test-infra repository.

@ti-chi-bot ti-chi-bot added size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. and removed size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels Jan 31, 2023
@ti-chi-bot ti-chi-bot bot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label May 23, 2023
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ti-chi-bot bot commented May 23, 2023

PR needs rebase.

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/test-infra repository.

@ti-chi-bot ti-chi-bot closed this Oct 17, 2023
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