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This is an automated cherry-pick of #63829

What problem does this PR solve?

Issue Number: close #63810

Problem Summary:

What changed and how does it work?

Previously, we didn't pay attention to reusing the slices of columns, which led to a lot of memory allocation here. We have specially optimized this.

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 ti-chi-bot added do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. release-note-none Denotes a PR that doesn't merit a release note. sig/planner SIG: Planner size/S Denotes a PR that changes 10-29 lines, ignoring generated files. type/cherry-pick-for-release-8.5 This PR is cherry-picked to release-8.5 from a source PR. labels Dec 1, 2025
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@hawkingrei This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

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ti-chi-bot bot commented Dec 1, 2025

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

  1. It must be approved by the approvers firstly.
  2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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ti-chi-bot bot commented Dec 1, 2025

@ti-chi-bot: ## If you want to know how to resolve it, please read the guide in TiDB Dev Guide.

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@ti-chi-bot ti-chi-bot bot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Dec 1, 2025
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ti-chi-bot bot commented Dec 1, 2025

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign ghazalfamilyusa, zanmato1984 for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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Needs approval from an approver in each of these files:

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

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ti-chi-bot bot commented Dec 1, 2025

@ti-chi-bot: The following tests 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/unit-test bba84c7 link true /test unit-test
idc-jenkins-ci-tidb/check_dev_2 bba84c7 link true /test check-dev2
idc-jenkins-ci-tidb/build bba84c7 link true /test build
idc-jenkins-ci-tidb/check_dev bba84c7 link true /test check-dev
idc-jenkins-ci-tidb/mysql-test bba84c7 link true /test mysql-test

Full PR test history. Your PR dashboard.

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do-not-merge/cherry-pick-not-approved do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. release-note-none Denotes a PR that doesn't merit a release note. sig/planner SIG: Planner size/M Denotes a PR that changes 30-99 lines, ignoring generated files. type/cherry-pick-for-release-8.5 This PR is cherry-picked to release-8.5 from a source PR.

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