importinto: fix checksum always use default distsql-scan-concurrency

[D3Hunter]

What problem does this PR solve?

Issue Number: close #50805

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  check adjust concurrency works

[2024/01/30 12:31:29.634 +08:00] [INFO] [table_import.go:933] ["checksum with adjusted distsql scan concurrency"] [concurrency=50]

• 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]

/check-issue-triage-complete

[codecov]

Codecov Report

Merging #50807 (3ca4701) into master (7087f70) will increase coverage by 2.1306%.
Report is 1 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #50807        +/-   ##
================================================
+ Coverage   70.5545%   72.6851%   +2.1306%     
================================================
  Files          1465       1465                
  Lines        433455     433786       +331     
================================================
+ Hits         305822     315298      +9476     
+ Misses       108436      98651      -9785     
- Partials      19197      19837       +640     

Flag	Coverage Δ
integration	49.0825% <100.0000%> (?)
unit	70.3433% <100.0000%> (-0.0296%)	⬇️

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

Components	Coverage Δ
dumpling	54.1120% <ø> (ø)
parser	∅ <ø> (∅)
br	51.2605% <ø> (+5.4916%)	⬆️

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, lance6716

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• pkg/executor/importer/OWNERS [lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-30 04:50:25.221804428 +0000 UTC m=+1454666.786102125: ☑️ agreed by lance6716.
• 2024-01-30 06:00:21.565986662 +0000 UTC m=+1458863.130284367: ☑️ agreed by Benjamin2037.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #50815.