[jira] [Updated] (BEAM-12626) Side inputs with Session windows are not populated

["Kenneth Knowles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-12626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kenneth Knowles updated BEAM-12626:
-----------------------------------
    Status: Open  (was: Triage Needed)

> Side inputs with Session windows are not populated
> --------------------------------------------------
>
>                 Key: BEAM-12626
>                 URL: https://issues.apache.org/jira/browse/BEAM-12626
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>            Reporter: Ahmet Altay
>            Assignee: Ahmet Altay
>            Priority: P2
>
> In the following pipeline:
> windowed = (
>     p
>     | beam.Create([('k', 1), ('k', 2), ('k', 20)])
>     | beam.MapTuple(
>         lambda k, v: beam.transforms.window.TimestampedValue((k, v), v))
>     | beam.WindowInto(beam.transforms.window.Sessions(10)))
> windowed | beam.Map(lambda k, si: (k, si), beam.pvalue.AsIter(windowed))
> side input values are always empty. 
> The problem does not happen with FixedWindows, and in Java similarly formed pipelines (side input with Sessions windows) are rejected (https://github.com/apache/beam/blob/8463a054c1d7e2b7ee8d11e9569e065cb5e02196/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/windowing/Sessions.java#L97)



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