[AilinKid]

What problem does this PR solve?

Issue Number: close #42631

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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.

doc: add grouping sets doc

[tiprow]

Hi @AilinKid. Thanks for your PR.

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[elsa0520]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elsa0520, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-13 04:41:43.269005374 +0000 UTC m=+60469.236593410: ☑️ agreed by elsa0520.
• 2024-01-08 09:58:21.786741613 +0000 UTC m=+264491.370995295: ☑️ agreed by hawkingrei.