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https://issues.apache.org/jira/browse/BEAM-13056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17434469#comment-17434469
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Andrew Pilloud commented on BEAM-13056:
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I've found that ParDo.getDoFnSchemaInformation has no tests, so I'm working on
that now.
> Add method to fetch ProcessContext FieldAccess
> ----------------------------------------------
>
> Key: BEAM-13056
> URL: https://issues.apache.org/jira/browse/BEAM-13056
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core
> Reporter: Andrew Pilloud
> Assignee: Andrew Pilloud
> Priority: P1
>
> There is DoFnSignature.fieldAccessDeclarations, which returns declared
> FieldAccess, but we are missing a way to return the set of FieldAccess that
> is actually used.
> Aside from what is returned by fieldAccessDeclarations, there are implicit
> FieldAccessDescriptor.withAllFields() created by @Element and @ProcessContext.
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