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https://issues.apache.org/jira/browse/BEAM-10495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548770#comment-17548770
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Danny McCormick commented on BEAM-10495:
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This issue has been migrated to https://github.com/apache/beam/issues/20385
> Document composite transforms with no input and/or output
> ---------------------------------------------------------
>
> Key: BEAM-10495
> URL: https://issues.apache.org/jira/browse/BEAM-10495
> Project: Beam
> Issue Type: Improvement
> Components: website
> Reporter: Udi Meiri
> Priority: P3
>
> Update the programming guide's Composite Transforms section:
> - When to use PBegin/PDone in Java (no input/output PCollections)
> - Similarly for Python: PBegin/None, and update PBegin pydoc string
> Discussion:
> https://lists.apache.org/thread.html/r5cad76ea7b5b8404d159dd14c24964242b1d4b49787d6aa6c162d948%40%3Cdev.beam.apache.org%3E
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