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Fix PreCommit Python Transforms job#36031

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Amar3tto wants to merge 1 commit intomasterfrom
fix-python-transforms
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Fix PreCommit Python Transforms job#36031
Amar3tto wants to merge 1 commit intomasterfrom
fix-python-transforms

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@Amar3tto Amar3tto commented Sep 2, 2025

Fixes #35832
Successful run: https://github.com/apache/beam/actions/runs/17402483884


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@Amar3tto Amar3tto requested a review from damccorm September 2, 2025 15:04
@github-actions github-actions bot added the python label Sep 2, 2025
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Summary of Changes

Hello @Amar3tto, 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 addresses an issue with the pre-commit Python transforms job by making adjustments to two test files. The changes ensure that pipeline tests are executed reliably by providing explicit runner configurations and preventing unintended optimization of PCollections.

Highlights

  • External Transform Test Fix: Modified the 'test_external_transform_finder_leaf' to explicitly set 'DirectRunner' as a pipeline option, ensuring consistent test execution.
  • Utility Test Pruning Prevention: Introduced a terminal consumer ('Count.PerElement()') in 'test_identity_window_fn_with_none_window' to prevent PCollection pruning, ensuring the test logic is fully executed.
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def test_external_transform_finder_leaf(self):
pipeline = beam.Pipeline()
opts = PipelineOptions(['--runner=DirectRunner'])
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What problem is this causing? This should be the default, so I'm surprised this helps

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Check is failing so it doesn't help, I will continue to work on this

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Fixed

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github-actions bot commented Sep 2, 2025

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R: @damccorm for label python.

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@Amar3tto Amar3tto force-pushed the fix-python-transforms branch 2 times, most recently from c0588c2 to f94d1a8 Compare September 3, 2025 11:58
@Amar3tto Amar3tto force-pushed the fix-python-transforms branch from a6c13e5 to f68e589 Compare September 4, 2025 08:33
@Amar3tto Amar3tto requested a review from damccorm September 4, 2025 10:12
Comment on lines +378 to +379
found = has_external(pipeline)
self.assertTrue(found, f"No ExternalTransform found; saw: {found}")
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I think this removes the purpose of what we're testing here - we are trying to make sure that Beam can correctly identify external transforms when we run it.

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I think the core problem is that this is running on Prism, but Prism theoretically should be excluding this -

if isinstance(transform, beam.ExternalTransform):

I'm not sure why it isn't yet, but taking a look

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Letting tests run now, but I validated #36049 should work locally and I think it is a better fix.

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Ok, let's try.
Also the issue usually relates only to this particular 'no-output' transform

@Amar3tto Amar3tto closed this Sep 9, 2025
@Amar3tto Amar3tto deleted the fix-python-transforms branch September 24, 2025 13:59
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The PreCommit Python Transforms job is flaky

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