lightning: sample once parquet file (#56205)

[ti-chi-bot]

This is an automated cherry-pick of #56205

What problem does this PR solve?

Issue Number: close #56104

Problem Summary:

What changed and how does it work?

From test, before this pr, lightning importing ten files in parquet format needs to takes 4m40s in the preparation stage. After this pr, lightning importing ten files in parquet format needs to takes 1m10s.

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

[zeminzhou]

/cherry-pick-invite

[CbcWestwolf]

/cherry-pick-invite

[ti-chi-bot]

@CbcWestwolf you're already a collaborator in repo ti-chi-bot/tidb

[fzzf678]

/cherry-pick-invite

[ti-chi-bot]

@fzzf678 you're already a collaborator in repo ti-chi-bot/tidb

[zeminzhou]

/cherry-pick-invite

[ti-chi-bot]

@zeminzhou Please accept the invitation then you can push to the cherry-pick pull requests.
Comment with "/cherry-pick-invite" if the invitation is expired.
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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, lance6716

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• br/pkg/lightning/OWNERS [D3Hunter,lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-06 07:28:56.072081487 +0000 UTC m=+1399123.691736002: ☑️ agreed by lance6716.
• 2024-12-06 07:45:30.065969605 +0000 UTC m=+1400117.685624116: ☑️ agreed by D3Hunter.

[codecov]

Codecov Report

Attention: Patch coverage is 18.51852% with 22 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.5@bf0766b). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #57921   +/-   ##
================================================
  Coverage               ?   72.2634%           
================================================
  Files                  ?       1415           
  Lines                  ?     414017           
  Branches               ?          0           
================================================
  Hits                   ?     299183           
  Misses                 ?      94877           
  Partials               ?      19957           

Flag	Coverage Δ
unit	72.2634% <18.5185%> (?)

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

Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	54.2732% <0.0000%> (?)