disttask: use merge sort meta

[ywqzzy]

What problem does this PR solve?

Issue Number: ref #45719

Problem Summary:

What is changed and how it works?

1. record subtask meta for merge sort step.
2. use prev step subtask meta in ingest step.
3. add more log

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 #47599 (62abb49) into master (34bc3a1) will increase coverage by 0.8696%.
The diff coverage is 10.4477%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47599        +/-   ##
================================================
+ Coverage   71.9564%   72.8260%   +0.8696%     
================================================
  Files          1396       1419        +23     
  Lines        404738     411151      +6413     
================================================
+ Hits         291235     299425      +8190     
+ Misses        93906      92882      -1024     
+ Partials      19597      18844       -753     

Flag	Coverage Δ
integration	41.1990% <0.0000%> (?)
unit	71.9295% <10.4477%> (-0.0270%)	⬇️

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	48.6707% <ø> (-4.2829%)	⬇️

[ywqzzy]

To reduce too much log

[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:

• 2023-10-13 01:43:43.068966171 +0000 UTC m=+1362220.656076315: ☑️ agreed by wjhuang2016.
• 2023-10-16 07:02:00.360155586 +0000 UTC m=+1640517.947265716: ☑️ agreed by lance6716.