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https://issues.apache.org/jira/browse/BEAM-13658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17549786#comment-17549786
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Danny McCormick commented on BEAM-13658:
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This issue has been migrated to https://github.com/apache/beam/issues/21359
> Support projection pushdown after beginning of pipeline.
> --------------------------------------------------------
>
> Key: BEAM-13658
> URL: https://issues.apache.org/jira/browse/BEAM-13658
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core
> Reporter: Kyle Weaver
> Priority: P2
>
> The first iteration of projection pushdown will only support pushdown on
> transforms at the beginning of the pipeline.
> This is due to difficulties using PTransformOverrideFactory - it requires
> getting the transform's input as an argument, and there's currently no way to
> do this generically.
> For more on projection pushdown, see BEAM-12976.
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