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https://issues.apache.org/jira/browse/BEAM-11024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17231643#comment-17231643
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Beam JIRA Bot commented on BEAM-11024:
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> Visit composite transform nodes in Pipeline._check_replacement()
> ----------------------------------------------------------------
>
> Key: BEAM-11024
> URL: https://issues.apache.org/jira/browse/BEAM-11024
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Yifan Mai
> Priority: P2
>
> Pipeline.replace_all() calls _replace(), which replaces transform nodes using
> a PipelineVisitor, and then _check_replacement(), which validates that there
> are no replaceable transform nodes using a PipelineVisitor i.e. it checks
> that PTransformOverride.matches() does not return True on any nodes.
> Currently, _replace() visits [both composite and leaf transform
> nodes|https://github.com/apache/beam/blob/b7ae7bb1dc28a7c8f26e9f48682e781a74e2d3c4/sdks/python/apache_beam/pipeline.py#L376-L382]
> whereas _check_replacement() visits [only leaf transform
> nodes|https://github.com/apache/beam/blob/b7ae7bb1dc28a7c8f26e9f48682e781a74e2d3c4/sdks/python/apache_beam/pipeline.py#L463-L468].
> _check_replacement() should visit composite transform nodes as well for
> symmetry.
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