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https://issues.apache.org/jira/browse/BEAM-5843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16666719#comment-16666719
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Rui Wang commented on BEAM-5843:
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Due to CALCITE-2645, even we expand the window_end in GROUP BY fields, we still
cannot establish the correct input reference for session_end.
> Expand Grouped Window Functions to window_start and window_end in Aggregation
> ------------------------------------------------------------------------------
>
> Key: BEAM-5843
> URL: https://issues.apache.org/jira/browse/BEAM-5843
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
>
> Right now, the session window_end is always equal to window_start due to
> missing implementation window_end for grouped window functions. Should fix
> this bug by adding window_end to BeamAggregationRel.
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