planner: fix agg push down rule mistake order by item inside agg function (#50002)

[ti-chi-bot]

This is an automated cherry-pick of #50002

What problem does this PR solve?

Issue Number: close #49986

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.

planner: fix agg push down rule mistake order by item inside agg function

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.5@bf303b5). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #50018   +/-   ##
================================================
  Coverage               ?   71.9718%           
================================================
  Files                  ?       1400           
  Lines                  ?     406623           
  Branches               ?          0           
================================================
  Hits                   ?     292654           
  Misses                 ?      94264           
  Partials               ?      19705           

Flag	Coverage Δ
unit	71.9718% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9913% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.2832% <0.0000%> (?)

[fixdb]

+1

[fixdb]

Please fix conflict.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, fixdb

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-25 07:07:41.160599996 +0000 UTC m=+1030902.724897701: ☑️ agreed by fixdb.
• 2024-01-25 09:23:15.300686445 +0000 UTC m=+1039036.864984150: ☑️ agreed by AilinKid.

[AilinKid]

/test unit-test

[tiprow]

@AilinKid: No presubmit jobs available for pingcap/tidb@release-7.5

In response to this:

/test unit-test

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