stmtsummary: reduce the memory consumption by information_schema.statements_summary_evicted

[crazycs520]

What problem does this PR solve?

Issue Number: close #56629

Problem Summary: reduce the memory consumption by information_schema.statements_summary_evicted

What changed and how does it work?

Remove the digest map of statements_summary_evicted, use a counter to count evicted digest.

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

[tiprow]

Hi @crazycs520. Thanks for your PR.

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[crazycs520]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.9024%. Comparing base (e13bfeb) to head (da66696).
Report is 59 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56722         +/-   ##
=================================================
- Coverage   73.3262%   57.9024%   -15.4239%     
=================================================
  Files          1630       1786        +156     
  Lines        450312     647923     +197611     
=================================================
+ Hits         330197     375163      +44966     
- Misses        99833     247557     +147724     
- Partials      20282      25203       +4921     

Flag	Coverage Δ
integration	40.0831% <75.0000%> (?)
unit	73.3566% <100.0000%> (+0.8965%)	⬆️

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

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	63.4616% <ø> (+17.8729%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-18 08:57:07.559852216 +0000 UTC m=+607024.708762046: ☑️ agreed by tiancaiamao.
• 2024-10-21 02:20:01.906088537 +0000 UTC m=+231202.602879142: ☑️ agreed by lcwangchao.

[crazycs520]

/retest-required

[GMHDBJD]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: GMHDBJD, lcwangchao, tiancaiamao

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Needs approval from an approver in each of these files:

• OWNERS [GMHDBJD,lcwangchao,tiancaiamao]
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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #56945.