Charles Chen created BEAM-3759:

             Summary: Add support for PaneInfo descriptor in Python SDK
                 Key: BEAM-3759
             Project: Beam
          Issue Type: Improvement
          Components: sdk-py-core
    Affects Versions: 2.3.0
            Reporter: Charles Chen
            Assignee: Charles Chen

The PaneInfo descriptor allows a user to determine which particular triggering 
emitted a value.  This allows the user to differentiate between speculative 
(early), on-time (at end of window) and late value emissions coming out of a 
GroupByKey.  We should add support for this feature in the Python SDK.

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