Check immutability violations in Dataflow Runner (as an option)
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core
good first issue
new feature
P3
python
- Dominant language
- Java
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Description
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) This should be offered as an option and worked based on sampling because of the cost of these checks.
Imported from Jira [BEAM-7395](https://issues.apache.org/jira/browse/BEAM-7395). Original Jira may contain additional context.
Reported by: altay.
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