executor: refine executor code

[windtalker]

What problem does this PR solve?

Issue Number: close #52903

Problem Summary:

What changed and how does it work?

• move join exec related code to tidb/pkg/executor/join
• move union exec related code to tidb/pkg/executor/union(to avoid cycle import)

Check List

Tests

• [x] 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[bot]]

Hi @windtalker. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 94.05204% with 48 lines in your changes are missing coverage. Please review.

Project coverage is 55.8127%. Comparing base (2343c54) to head (db38e17). Report is 14 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #52959         +/-   ##
=================================================
- Coverage   72.3920%   55.8127%   -16.5793%     
=================================================
  Files          1483       1625        +142     
  Lines        429021     605978     +176957     
=================================================
+ Hits         310577     338213      +27636     
- Misses        99142     244513     +145371     
- Partials      19302      23252       +3950     

Flag	Coverage Δ
integration	37.0382% <89.8389%> (?)
unit	71.4133% <87.8562%> (+0.1829%)	:arrow_up:

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	46.5196% <61.4583%> (+5.3072%)	:arrow_up:

[windtalker]

/test unit-test

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/test unit-test

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[windtalker]

/test check-dev2

[tiprow[bot]]

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In response to this:

/test check-dev2

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[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guo-shaoge, XuHuaiyu

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [XuHuaiyu,guo-shaoge]

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-05-06 09:22:23.291521736 +0000 UTC m=+867497.048657313: :ballot_box_with_check: agreed by guo-shaoge.
• 2024-05-07 02:32:31.435231818 +0000 UTC m=+929305.192367390: :ballot_box_with_check: agreed by XuHuaiyu.