fix: Support external window for subquery.

[Simon9997]

Description

Please briefly describe the code changes in this pull request.

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @Simon9997, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a limitation where external window functionality was not properly supported for subqueries. By adjusting the logic within the query planner, subqueries can now correctly utilize external windows, thereby enhancing the overall query planning capabilities and flexibility.

Highlights

• External Window Support: Enabled the creation of external window logic nodes for subqueries by removing a conditional check that previously prevented this functionality.

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[gemini-code-assist]

Code Review

This pull request enables support for external window functions within subqueries by removing a check that previously disabled this functionality. The change is straightforward and appears to correctly implement the intended feature. However, the pull request does not include any test cases to verify this new capability. It is highly recommended to add automated tests covering subqueries with external windows to ensure correctness and prevent potential regressions.