statistics: use slices.BinarySearchFunc to simple TopN.FindTopN

[hawkingrei]

What problem does this PR solve?

Issue Number: ref #45933

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 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

[codecov]

Codecov Report

Merging #46996 (b534a5b) into master (9bfa176) will decrease coverage by 0.5085%.
Report is 4 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46996        +/-   ##
================================================
- Coverage   73.2462%   72.7377%   -0.5085%     
================================================
  Files          1335       1356        +21     
  Lines        397697     404218      +6521     
================================================
+ Hits         291298     294019      +2721     
- Misses        87749      91577      +3828     
+ Partials      18650      18622        -28     

Flag	Coverage Δ
integration	28.6844% <100.0000%> (?)
unit	73.2815% <100.0000%> (+0.0353%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	85.0060% <ø> (+0.0310%)	⬆️
br	48.6147% <ø> (-4.3057%)	⬇️

[hawkingrei]

/retest

[hawkingrei]

/retest

[hawkingrei]

/test tiprow_fast_test

[ti-chi-bot]

@hawkingrei: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test build
• /test canary-scan-security
• /test check-dev
• /test check-dev2
• /test mysql-test
• /test pingcap/tidb/canary_ghpr_unit_test
• /test pull-br-integration-test
• /test pull-common-test
• /test pull-e2e-test
• /test pull-integration-common-test
• /test pull-integration-copr-test
• /test pull-integration-ddl-test
• /test pull-integration-jdbc-test
• /test pull-integration-mysql-test
• /test pull-integration-prisma-test
• /test pull-mysql-connector-test
• /test pull-sqllogic-test
• /test pull-tiflash-test
• /test unit-test

The following commands are available to trigger optional jobs:

• /test pull-notify-when-compatibility-sections-changed

Use /test all to run the following jobs that were automatically triggered:

• pingcap/tidb/ghpr_build
• pingcap/tidb/ghpr_check
• pingcap/tidb/ghpr_check2
• pingcap/tidb/ghpr_mysql_test
• pingcap/tidb/ghpr_unit_test

In response to this:

/test tiprow_fast_test

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]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hi-rustin, time-and-fate

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• OWNERS [hi-rustin,time-and-fate]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-15 03:00:53.915180019 +0000 UTC m=+227219.882768088: ☑️ agreed by time-and-fate.
• 2023-09-15 03:02:38.049959007 +0000 UTC m=+227324.017547057: ☑️ agreed by hi-rustin.