global sort: merge to one file

[ywqzzy]

What problem does this PR solve?

Issue Number: ref #45719

Problem Summary:

What is changed and how it works?

In merge step of global sort, use one file writer to write sorted kv pairs into only one file.

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 @ywqzzy. Thanks for your PR.

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[codecov]

Codecov Report

Merging #48142 (4eb6dec) into master (1cf2826) will increase coverage by 1.4803%.
Report is 12 commits behind head on master.
The diff coverage is 54.2307%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #48142        +/-   ##
================================================
+ Coverage   71.0861%   72.5665%   +1.4803%     
================================================
  Files          1367       1391        +24     
  Lines        404619     414012      +9393     
================================================
+ Hits         287628     300434     +12806     
+ Misses        97043      94636      -2407     
+ Partials      19948      18942      -1006     

Flag	Coverage Δ
integration	43.8313% <0.0000%> (?)
unit	71.0128% <54.2307%> (-0.0734%)	⬇️

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

Components	Coverage Δ
dumpling	53.9663% <ø> (ø)
parser	∅ <ø> (∅)
br	48.7708% <71.4285%> (-4.2492%)	⬇️

[ywqzzy]

/retest

[tiprow]

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/retest

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-23 05:55:19.218428721 +0000 UTC m=+470147.883654901: ☑️ agreed by D3Hunter.
• 2023-11-23 06:11:36.986854765 +0000 UTC m=+471125.652081165: ☑️ agreed by wjhuang2016.

[3pointer]

BR part LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, D3Hunter, wjhuang2016

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer]
• br/pkg/lightning/OWNERS [D3Hunter]
• pkg/ddl/OWNERS [wjhuang2016]
• pkg/disttask/OWNERS [D3Hunter,wjhuang2016]

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[ywqzzy]

/retest

[tiprow]

@ywqzzy: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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.