expression: always use the ctx in parameter for method Equal in all expressions

[lcwangchao]

What problem does this PR solve?

Issue Number: close #48595

What is changed and how it works?

• Add a new method EqualColum to Column and CorrelatedColumn to avoid context input when determining two columns are equal.
• Always use parameter ctx instead of the inner context for all Expression.Equal methods.

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

[codecov]

Codecov Report

Merging #48596 (3e3a07a) into master (625dc4e) will increase coverage by 2.6565%.
Report is 25 commits behind head on master.
The diff coverage is 84.6846%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #48596        +/-   ##
================================================
+ Coverage   71.4230%   74.0796%   +2.6565%     
================================================
  Files          1404       1435        +31     
  Lines        407220     424080     +16860     
================================================
+ Hits         290849     314157     +23308     
+ Misses        96417      91247      -5170     
+ Partials      19954      18676      -1278     

Flag	Coverage Δ
integration	45.1189% <76.5765%> (?)
unit	72.7799% <76.6355%> (+1.3568%)	⬆️

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

Components	Coverage Δ
dumpling	53.9874% <ø> (ø)
parser	∅ <ø> (∅)
br	48.8130% <ø> (-4.2687%)	⬇️

[lcwangchao]

/retest

[YangKeao]

LGTM

[hawkingrei]

/test all

[lcwangchao]

/retest

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-16 02:22:53.724949812 +0000 UTC m=+4302171.312059956: ☑️ agreed by YangKeao.
• 2023-11-16 15:23:13.71421276 +0000 UTC m=+4348991.301322905: ☑️ agreed by winoros.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [XuHuaiyu,YangKeao,winoros]
• pkg/expression/OWNERS [XuHuaiyu]

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[lcwangchao]

/retest