expression: replace equal condition by true when to constant propagation | tidb-test=pr/2625

[hawkingrei]

What problem does this PR solve?

Issue Number: close #64216

Problem Summary:

What changed and how does it work?

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

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.4205%. Comparing base (4b3e59a) to head (049807e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #64309        +/-   ##
================================================
+ Coverage   72.7408%   73.4205%   +0.6797%     
================================================
  Files          1862       1863         +1     
  Lines        505235     505394       +159     
================================================
+ Hits         367512     371063      +3551     
+ Misses       115401     112165      -3236     
+ Partials      22322      22166       -156     

Flag	Coverage Δ
integration	41.7952% <69.4444%> (?)
unit	72.5646% <95.8333%> (+0.2518%)	⬆️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	46.2716% <ø> (+0.0952%)	⬆️

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[hawkingrei]

/retest

[hawkingrei]

/retest

[hawkingrei]

/retest

[hawkingrei]

/retest

[hawkingrei]

/retest