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Clean up mixed semi join by removing unused parameters and redundant table-swapping logic #19655

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PointKernel
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Description

This PR cleans up the mixed semi join implementation by removing unused parameters and eliminating the table-swapping logic, as it is always false in mixed semi joins.

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

@PointKernel PointKernel added the 3 - Ready for Review Ready for review by team label Aug 11, 2025
@PointKernel PointKernel requested a review from a team as a code owner August 11, 2025 23:17
@PointKernel PointKernel added libcudf Affects libcudf (C++/CUDA) code. improvement Improvement / enhancement to an existing function labels Aug 11, 2025
@PointKernel PointKernel requested a review from lamarrr August 11, 2025 23:17
@PointKernel PointKernel added the non-breaking Non-breaking change label Aug 11, 2025
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@bdice bdice left a comment

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Seems fine as long as tests pass. I am guessing tests will cover this being correct.

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This cleanup was identified during the mixed join migration #19660. I initially thought it would be easier to review as a relatively independent change, but it turned out to have overlapping modifications with the mixed join code, making it difficult to get tests passing without significant changes there. I’ll close this PR and address all related issues together in #19660 instead. Thanks for the quick review @bdice

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3 - Ready for Review Ready for review by team improvement Improvement / enhancement to an existing function libcudf Affects libcudf (C++/CUDA) code. non-breaking Non-breaking change
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