statistics: add bloomfilter to speedup findTopn

[hawkingrei]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What is changed and how it works?

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[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 ask for approval from hawkingrei. For more information see the Kubernetes Code Review Process.

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 71.7479%. Comparing base (b584055) to head (8a8bb56). :warning: Report is 5146 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47897        +/-   ##
================================================
- Coverage   71.7482%   71.7479%   -0.0004%     
================================================
  Files          1400       1400                
  Lines        405579     405571         -8     
================================================
- Hits         290996     290989         -7     
+ Misses        94846      94845         -1     
  Partials      19737      19737                

Flag	Coverage Δ
integration	∅ <ø> (?)

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Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	∅ <ø> (∅)
br	53.0414% <ø> (ø)

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[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.}

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Notice: To remove the do-not-merge/needs-tests-checked label, please finished the tests then check the finished items in description.

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Tests

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• [ ] Integration test
• [ ] Manual test (add detailed scripts or steps below)
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[tiprow[bot]]

@hawkingrei: 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
tiprow_fast_test	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test tiprow_fast_test

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[ti-chi-bot[bot]]

PR needs rebase.

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[ti-chi-bot[bot]]

@hawkingrei: 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	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test mysql-test
pull-integration-ddl-test	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test pull-integration-ddl-test
idc-jenkins-ci-tidb/check_dev_2	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test check-dev2
pull-mysql-client-test	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test pull-mysql-client-test
idc-jenkins-ci-tidb/unit-test	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test unit-test
idc-jenkins-ci-tidb/build	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test build
idc-jenkins-ci-tidb/check_dev	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test check-dev
pull-br-integration-test	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test pull-br-integration-test
pull-lightning-integration-test	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test pull-lightning-integration-test
pull-integration-e2e-test	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test pull-integration-e2e-test
pull-integration-realcluster-test-next-gen	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test pull-integration-realcluster-test-next-gen
pull-unit-test-next-gen	8a8bb568c9b9fe9791f1544e27c14aba96bf0079	link	true	/test pull-unit-test-next-gen

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.