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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 edited comment on FLINK-23544 at 8/31/21, 9:40 AM:
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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 with 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.
was (Author: twalthr):
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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