executor: reset groupCount when Close is called in streamagg executor (#53874)

[ti-chi-bot]

This is an automated cherry-pick of #53874

What problem does this PR solve?

Issue Number: close #53867

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.

Reset groupCount or streamagg executor will believe that current rows haven't been consumed and lead to panic

[windtalker]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: windtalker, XuHuaiyu

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-28 04:08:57.984304672 +0000 UTC m=+929733.118754793: ☑️ agreed by windtalker.
• 2024-08-28 04:52:55.699100324 +0000 UTC m=+932370.833550445: ☑️ agreed by XuHuaiyu.

[xzhangxian1008]

/retest

[codecov]

Codecov Report

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Additional details and impacted files

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