importinto: revert "use one writer for each kv group for all concurrent encoder"

[D3Hunter]

What problem does this PR solve?

This reverts pr #47185, using 1 writer for a kv group for all encode routine, will mix kvs(such as data) in different chunk into one sorted kv file, when write to tikv, external engine might switch from 1 file to another frequently as the ordered kvs might store in different files, and only a small part of it is continuous in one file, it causes import speed extremely slow

Issue Number: ref #46704, #47572

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  this pr only revert another pr, so existing test should be enough, we only do a simple manual test here:
• import with global sort, should work. for a case of 150g, takes 70m after vs 461m before
• 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 @D3Hunter. Thanks for your PR.

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[D3Hunter]

/test all

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[D3Hunter]

/ok-to-test

[codecov]

Codecov Report

Merging #47666 (1b7436e) into master (eafb78a) will increase coverage by 1.0142%.
Report is 10 commits behind head on master.
The diff coverage is 9.8039%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47666        +/-   ##
================================================
+ Coverage   71.9282%   72.9425%   +1.0142%     
================================================
  Files          1396       1419        +23     
  Lines        404781     412600      +7819     
================================================
+ Hits         291152     300961      +9809     
+ Misses        94027      92789      -1238     
+ Partials      19602      18850       -752     

Flag	Coverage Δ
integration	41.5876% <0.0000%> (?)
unit	72.0445% <9.8039%> (+0.1162%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	∅ <ø> (∅)
br	48.7484% <ø> (-4.1818%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716, wjhuang2016

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-16 10:01:00.491009056 +0000 UTC m=+1651258.078119201: ☑️ agreed by wjhuang2016.
• 2023-10-16 11:00:13.455858653 +0000 UTC m=+1654811.042968798: ☑️ agreed by lance6716.

[D3Hunter]

/retest