Support aggregation function pushdown in window

[xzhangxian1008]

What problem does this PR solve?

Issue Number: ref #7376

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

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[xzhangxian1008]

/hold

[xzhangxian1008]

/cc @SeaRise @windtalker

[ti-chi-bot]

PR needs rebase.

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[ti-chi-bot]

@xzhangxian1008: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-integration-test	fed2439	link	true	/test pull-integration-test

Full PR test history. Your PR dashboard.

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