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https://issues.apache.org/jira/browse/BEAM-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116969#comment-17116969
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Pablo Estrada commented on BEAM-3759:
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Unfortunately this is not fixed. PR 4763 only adds encoding support, but as
Charles pointed out, it does not add support for adding the PaneInfo after GBK
firings.
> Add support for PaneInfo descriptor in Python SDK
> -------------------------------------------------
>
> Key: BEAM-3759
> URL: https://issues.apache.org/jira/browse/BEAM-3759
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Affects Versions: 2.3.0
> Reporter: Charles Chen
> Priority: P2
> Fix For: 2.19.0
>
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> 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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