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Ensure flatten windows match #30410

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merged 3 commits into from
Feb 27, 2024

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damccorm
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When these windows don't match, it can create unexpected behavior downstream; it doesn't really make sense to flatten different windows.

Fixes #22903


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for pcoll in pcolls:
self._check_pcollection(pcoll)
if pcoll.windowing != windowing:
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Shall we just log the error since raising the error could break some users' existing jobs?

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Yeah, I think that's a good idea. It turns out our test asserts actually do this already for some weird reasons, so I'm sure others do as well. That's what is causing CI to fail - https://github.com/apache/beam/blob/20675c860f46f3f4abce061a6b490166ca68df0f/sdks/python/apache_beam/testing/util.py#L286C7-L286C22

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Test failures fixed by #30418

@damccorm damccorm merged commit b7a58bf into apache:master Feb 27, 2024
70 of 72 checks passed
@damccorm damccorm deleted the users/damccorm/flattenWindowing branch February 27, 2024 14:41
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[Bug]: Flattening PCollections with incompatible windowing should be a construction-time error.
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