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https://issues.apache.org/jira/browse/BEAM-529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17197941#comment-17197941
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Konstantinos Katsiapis commented on BEAM-529:
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This might be easy to implement for the *subset* of types that offer a
deterministic Coder (eg by calling as_deterministic() on the pertinent Coder).
Increasing the priority of this since we continue to encounter user pipelines
that mutate input elements in DoFns and CombineFns.
> Check immutability violations in DirectPipelineRunner
> -----------------------------------------------------
>
> Key: BEAM-529
> URL: https://issues.apache.org/jira/browse/BEAM-529
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py-core
> Reporter: Ahmet Altay
> Priority: P1
> Labels: newbie, starter
>
> Users are going to mutate inputs and outputs of DoFn inappropriately. We
> should help their tests fail to catch such mistakes. (Similar to the
> DirectPipelineRunner in Java SDK)
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