damccorm opened a new issue, #21430:
URL: https://github.com/apache/beam/issues/21430

   Unfortunately I haven't been able to diagnose the exact issue here or come 
up with a minimal repro. I just have some code to reproduce in 
https://github.com/apache/beam/pull/16445.
   
   That PR adds support for value_count(bins) in the DataFrame API, which for 
some reason is interacting poorly with pipeline pruning in interactive Beam 
(rehydrating the pipeline raises an error about a PCollection's producer 
missing). The PR also adds a test to transform_test.py that replicate the 
issue, as well as a temporary mitigation in pipeline_fragment.py. I think the 
mitigation is effectively disabling pipeline pruning, so it likely shouldn't be 
merged.
   
   Imported from Jira 
[BEAM-13624](https://issues.apache.org/jira/browse/BEAM-13624). Original Jira 
may contain additional context.
   Reported by: bhulette.


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