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https://issues.apache.org/jira/browse/BEAM-1159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546309#comment-17546309
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Kenneth Knowles commented on BEAM-1159:
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This issue has been migrated to https://github.com/apache/beam/issues/18191
> DoFnSignature should have info on the fn's side inputs and outputs
> ------------------------------------------------------------------
>
> Key: BEAM-1159
> URL: https://issues.apache.org/jira/browse/BEAM-1159
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Eugene Kirpichov
> Priority: P3
> Labels: Clarified
>
> This is logically part of the fn itself, rather than its enclosing transform.
> Example where this would have been important:
> signature.processElement().observesWindow() should return true for a DoFn
> that has any side inputs, since side inputs are windowed. See BEAM-1149.
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