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Fuse simple streaming reductions in cudf-polars #18757

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Description

Fuse together simple reductions on distinct columns in the cudf-polars streaming executor.
Note: It is unclear if this optimization improves performance (TBD).

Checklist

  • I am familiar with the Contributing Guidelines.
  • New or existing tests cover these changes.
  • The documentation is up to date with these changes.

@rjzamora rjzamora self-assigned this May 12, 2025
@rjzamora rjzamora added 2 - In Progress Currently a work in progress improvement Improvement / enhancement to an existing function non-breaking Non-breaking change cudf-polars Issues specific to cudf-polars labels May 12, 2025
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@github-actions github-actions bot added the Python Affects Python cuDF API. label May 12, 2025
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/ok to test

@GPUtester GPUtester moved this to In Progress in cuDF Python May 12, 2025
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2 - In Progress Currently a work in progress cudf-polars Issues specific to cudf-polars improvement Improvement / enhancement to an existing function non-breaking Non-breaking change Python Affects Python cuDF API.
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