planner: incorrect query result using ISNULL in the nested expressions

[hawkingrei]

What problem does this PR solve?

Issue Number: close #55299

Problem Summary:

What changed and how does it work?

in the https://github.com/pingcap/tidb/pull/54819， We prevent isnull(xxx) to transfer =null. but it is wrong. we should transfer it into the right way in the points2EqOrInCond

for the example, if we meet column1 with [null,1,2,3] putting into the points2EqOrInCond. it should return isnull(column1) or column1 in (1,2,3).

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

Attention: Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.

Project coverage is 74.7086%. Comparing base (2abd334) to head (e36e79e).
Report is 13 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55306        +/-   ##
================================================
- Coverage   74.8217%   74.7086%   -0.1132%     
================================================
  Files          1572       1572                
  Lines        365097     440890     +75793     
================================================
+ Hits         273172     329383     +56211     
- Misses        72157      91312     +19155     
- Partials      19768      20195       +427     

Flag	Coverage Δ
integration	48.8957% <70.3703%> (?)
unit	71.8181% <88.8888%> (-1.9175%)	⬇️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (-2.2327%)	⬇️
parser	∅ <ø> (∅)
br	52.4820% <ø> (+4.8278%)	⬆️

[hawkingrei]

/retest

[hawkingrei]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qw4990, winoros

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-12 14:30:59.666340171 +0000 UTC m=+191944.369809825: ☑️ agreed by winoros.
• 2024-08-13 02:55:38.894708102 +0000 UTC m=+236623.598177756: ☑️ agreed by qw4990.