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https://issues.apache.org/jira/browse/BEAM-12071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17312483#comment-17312483
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Brian Hulette commented on BEAM-12071:
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cherrypick is up: https://github.com/apache/beam/pull/14383
> DataFrame IO sinks do not correctly partition by window
> -------------------------------------------------------
>
> Key: BEAM-12071
> URL: https://issues.apache.org/jira/browse/BEAM-12071
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Affects Versions: 2.26.0, 2.27.0, 2.28.0
> Reporter: Brian Hulette
> Assignee: Brian Hulette
> Priority: P1
> Labels: dataframe-api
> Fix For: 2.29.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> I just discovered that when processing windowed data with DataFrameTransform,
> only one partition is written to every window, and a single window gets every
> other partition/window combination.
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