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https://issues.apache.org/jira/browse/FLINK-23544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17407205#comment-17407205
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Timo Walther commented on FLINK-23544:
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If we want to fix this issue properly we need to wait for CALCITE-4337. We have
put it on our internal team roadmap but lower priority, any help here would be
highly appreciated. Esp. by people that are more familiar with the Calcite code
base.
I would vote for reverting this change. It is not compliant with SQL and we
cannot effort a third syntax for session windows once CALCITE-4337 is
implemented. Users have an alternative using the old session windows for 1.14.
But we should aim to fix this for 1.15.
> Window TVF Supports session window
> ----------------------------------
>
> Key: FLINK-23544
> URL: https://issues.apache.org/jira/browse/FLINK-23544
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Reporter: JING ZHANG
> Assignee: JING ZHANG
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.14.0
>
>
> Window TVF would support SESSION window in the following case:
> # SESSION Window TVF followed by Window Aggregate, in this case SESSION
> window TVF would be pulled up into WindowAggregate, so Window assigner would
> happen in WindowAggrgeate
>
> *Note, SESSION window TVF only works in limited cases currently, the
> following user cases is not supported yet:*
> # *SESSION WINDOW TVF followed by Window JOIN*
> # *SESSION WINDOW TVF followed by Window RANK***
> *BESIDES, SESSION window Aggregate does not support the following performance
> improvement yet:*
> 1. Split Distinct Aggregation
> 2. Local-global Aggregation
> 3. Mini-batch Aggregate
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