FIX-#6227: Make sure Series.unique() with pyarrow dtype returns ArrowExtensionArray

[local-dev-korbit-ai-mentor]

What do these changes do?

• first commit message and PR title follow format outlined here

  NOTE: If you edit the PR title to match this format, you need to add another commit (even if it's empty) or amend your last commit for the CI job that checks the PR title to pick up the new PR title.

• passes flake8 modin/ asv_bench/benchmarks scripts/doc_checker.py
• passes black --check modin/ asv_bench/benchmarks scripts/doc_checker.py
• signed commit with git commit -s
• Resolves #6227
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date

Description by Korbit AI

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What change is being made?

Ensure Series.unique() with pyarrow dtype returns ArrowExtensionArray by modifying the return statement and adding a corresponding test case.

Why are these changes being made?

This change addresses issue #6227, where Series.unique() was not returning the expected ArrowExtensionArray type when using pyarrow dtype. The modification ensures compatibility and correctness, and the added test case verifies the fix.

Summary by CodeRabbit

• New Features

  • Improved the unique method in Series for better performance, directly returning unique values as a NumPy array.

• Tests

  • Added a new test to validate the unique method's behavior with uint8[pyarrow] data type, ensuring consistency with Pandas outputs.

[local-dev-korbit-ai-mentor]

Clone of the PR modin-project/modin#7042

[korbit-ai]

My review is in progress 📖 - I will have feedback for you in a few minutes!

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The changes enhance the unique method in the Series class of Modin’s pandas implementation. The new approach improves performance by directly returning unique values as a NumPy array, avoiding unnecessary object creation. Additionally, a new test case has been added to ensure the correctness of the modified method, specifically for the uint8[pyarrow] data type, thereby increasing test coverage and robustness.

Changes

Files	Change Summary
modin/pandas/series.py	Updated the unique method to return unique values as a NumPy array for better performance and clarity.
modin/pandas/test/test_series.py	Added test_unique_pyarrow_dtype to validate the unique method's behavior with uint8[pyarrow].

Poem

In the meadow where data flows,
A rabbit hops, and knowledge grows.
Unique values now leap with grace,
No more clutter in this space!
With tests to guard our joyful dance,
In Modin's world, we take a chance! 🐇✨

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[korbit-ai]

I have reviewed your code and did not find any issues!

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Please note that I can make mistakes, and you should still encourage your team to review your code as well.

[furwellness]

/review

[codiumai-pr-agent-free]

PR Reviewer Guide 🔍

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Key issues to review Implementation Change The implementation of the unique method has been changed. It now uses to_pandas().squeeze(axis=1).values instead of to_numpy(). This change might affect the return type and behavior.

[furwellness]

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