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https://issues.apache.org/jira/browse/BEAM-11084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17382225#comment-17382225
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Beam JIRA Bot commented on BEAM-11084:
--------------------------------------
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> [Go SDK] Validate Windowing
> ---------------------------
>
> Key: BEAM-11084
> URL: https://issues.apache.org/jira/browse/BEAM-11084
> Project: Beam
> Issue Type: Task
> Components: sdk-go
> Reporter: Robert Burke
> Priority: P3
>
> While Windowing basics are implemented in the Go SDK, there is precious
> little validation that it's correct. Much work has been done largely for the
> benefit of Global Windowing.
> DoFn Authors can specify event times for elements by returning a
> `beam.EventTime` along with their element, allowing windowing transforms by
> the runner to take effect. They can observe windows in their DoFns by having
> a `[]beam.Window` parameter, and extract results.
> Pipeline authors can insert `beam.WindowInto` transforms to have elements be
> batched into the appropriate window slices.
> But very little of this has been validated end to end. This umbrella task is
> to test and validate specific aspects of the window implementation to ensure
> correctness.
> The tricky part is that windows are selected by runners, meaning many of
> these must be integration tests.
> * Windows are correctly observed in DoFns.
> * Validate windows are aggregated correctly in GBKs and Lifted Combines
> ** In particular sliding windows where a single element could contribute to
> multiple aggregates
> * Validate Side Input behavior WRT windows (implicit observation of windows)
> ** In particular, Side Inputs are valid per window.
>
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