Changed OrderPreservingColumnTransformer back to ColumnTransformer

[magnus-priorlabs]

…e to better Performance

Changed back to vanilla ColumnTransformer (despite incorrect categorical column indicators to feature mappings afterwards), due to improved performance. Added explanatory comment.

Issue

Please link the corresponding GitHub issue. If an issue does not already exist,
please open one to describe the bug or feature request before creating a pull request.

This allows us to discuss the proposal and helps avoid unnecessary work.
Originally "solved" in this PR (#539).

Motivation and Context

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Public API Changes

• No Public API changes
• Yes, Public API changes (Details below)

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How Has This Been Tested?

locally

Checklist

• The changes have been tested locally.
• Documentation has been updated (if the public API or usage changes).
• A entry has been added to CHANGELOG.md (if relevant for users).
• The code follows the project's style guidelines.
• I have considered the impact of these changes on the public API.

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[CLAassistant]

All committers have signed the CLA.

[gemini-code-assist]

Code Review

This pull request reverts the use of OrderPreservingColumnTransformer back to scikit-learn's ColumnTransformer to improve performance. The author has correctly identified and documented that this change can lead to misaligned categorical feature indices. My feedback focuses on making this known issue more visible as technical debt by adding a TODO comment.

[chatgpt-codex-connector]

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