expression: Move more methods from SessionVars to BuildContext

[lcwangchao]

What problem does this PR solve?

Issue Number: ref #52366

What changed and how does it work?

Added more methods in expression.BuildContext

• AllocPlanColumnID to allocate column id for Column expression.
• SetInUnionCast / IsInUnionCast is used when building expressions in union cast.
• SetInNullRejectCheck / IsInNullRejectCheck is used for bull reject check when building plan.

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]

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[codecov]

Codecov Report

Merging #52440 (d70142f) into master (a0b5861) will increase coverage by 2.2466%.
Report is 7 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #52440        +/-   ##
================================================
+ Coverage   72.1392%   74.3858%   +2.2466%     
================================================
  Files          1467       1467                
  Lines        426844     427120       +276     
================================================
+ Hits         307922     317717      +9795     
+ Misses        99686      89605     -10081     
- Partials      19236      19798       +562     

Flag	Coverage Δ
integration	48.8754% <100.0000%> (?)
unit	71.0554% <100.0000%> (+0.0423%)	⬆️

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	49.7901% <ø> (+8.7152%)	⬆️

[YangKeao]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-09 06:50:10.32036438 +0000 UTC m=+945071.847904907: ☑️ agreed by YangKeao.
• 2024-04-09 06:59:25.251852052 +0000 UTC m=+945626.779392611: ☑️ agreed by XuHuaiyu.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, XuHuaiyu, YangKeao

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Needs approval from an approver in each of these files:

• OWNERS [XuHuaiyu,YangKeao,hawkingrei]
• pkg/expression/OWNERS [XuHuaiyu]
• pkg/planner/OWNERS [hawkingrei]

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