executor: modify the spill chunk size of topn

[EricZequan]

What problem does this PR solve?

Issue Number: ref #58891

Problem Summary:

What changed and how does it work?

The chunk is created by topN's schema when spill happens, so it will miss some rows and throw an error. This pr is consistent with #58500 , using children(0) instead.

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]

Hi @EricZequan. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.5546%. Comparing base (7ca323f) to head (516cd2a).
Report is 4 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58889        +/-   ##
================================================
+ Coverage   73.1228%   73.5546%   +0.4317%     
================================================
  Files          1678       1678                
  Lines        464071     464111        +40     
================================================
+ Hits         339342     341375      +2033     
+ Misses       103871     101876      -1995     
- Partials      20858      20860         +2     

Flag	Coverage Δ
integration	42.9080% <100.0000%> (?)
unit	72.3303% <100.0000%> (+0.0242%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	45.7389% <ø> (+0.0388%)	⬆️

[xzhangxian1008]

LGTM

[EricZequan]

/check-issue-triage-complete

[GMHDBJD]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-13 09:21:13.471701606 +0000 UTC m=+777416.760533314: ☑️ agreed by xzhangxian1008.
• 2025-01-13 09:40:34.222003797 +0000 UTC m=+778577.510835501: ☑️ agreed by GMHDBJD.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: GMHDBJD, hawkingrei, xzhangxian1008

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[EricZequan]

/retest

[tiprow]

@EricZequan: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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