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https://issues.apache.org/jira/browse/FLINK-9422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot closed FLINK-9422.
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Resolution: Auto Closed
This issue was labeled "stale-minor" 7 ago and has not received any updates so
I have gone ahead and closed it. If you are still affected by this or would
like to raise the priority of this ticket please re-open, removing the label
"auto-closed" and raise the ticket priority accordingly.
> Dedicated DISTINCT operator for streaming tables with time attributes
> ---------------------------------------------------------------------
>
> Key: FLINK-9422
> URL: https://issues.apache.org/jira/browse/FLINK-9422
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Legacy Planner
> Reporter: Fabian Hueske
> Assignee: Ruidong Li
> Priority: Minor
> Labels: auto-closed, stale-assigned
>
> We can implement a dedicated operator for a {{UNION}} operator on tables with
> time attributes. Currently, {{UNION}} is translated into a {{UNION ALL}} and
> a subsequent {{GROUP BY}} on all attributes without aggregation functions.
> The state of the grouping operator is only clean up using state retention
> timers.
> The dedicated operator would leverage the monotonicity property of the time
> attribute and watermarks to automatically clean up its state.
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