planner: optimize stats collection with buffer (WIP do not merge)

[ichen032]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What changed and how does it work?

Check List

Tests

• [x] 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[bot]]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456.

_{:open_book: For more info, you can check the "Contribute Code" section in the development guide.}

[ti-chi-bot[bot]]

Hi @ichen032. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ti-chi-bot[bot]]

[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 terry1purcell 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:

• pkg/statistics/OWNERS

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[tiprow[bot]]

Hi @ichen032. 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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[terry1purcell]

/ok-to-test

[tiprow[bot]]

@ichen032: 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
fast_test_tiprow	91614b3d0a6b262f38c60945b4c5cc55cc16cd28	link	true	/test fast_test_tiprow

Full PR test history. Your PR dashboard.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.3350%. Comparing base (f46112d) to head (91614b3). Report is 13 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61789        +/-   ##
================================================
+ Coverage   73.1012%   73.3350%   +0.2337%     
================================================
  Files          1730       1760        +30     
  Lines        481253     489294      +8041     
================================================
+ Hits         351802     358824      +7022     
- Misses       107913     108211       +298     
- Partials      21538      22259       +721     

Flag	Coverage Δ
integration	52.7534% <ø> (?)

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

Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	46.9660% <ø> (ø)

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[ti-chi-bot[bot]]

@ichen032: 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/mysql-test	91614b3d0a6b262f38c60945b4c5cc55cc16cd28	link	true	/test mysql-test
idc-jenkins-ci-tidb/check_dev_2	91614b3d0a6b262f38c60945b4c5cc55cc16cd28	link	true	/test check-dev2
idc-jenkins-ci-tidb/unit-test	91614b3d0a6b262f38c60945b4c5cc55cc16cd28	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	91614b3d0a6b262f38c60945b4c5cc55cc16cd28	link	true	/test check-dev

Full PR test history. Your PR dashboard.

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. I understand the commands that are listed here.