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From "Ruidong Li (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (FLINK-9422) Dedicated operator for UNION on streaming tables with time attributes
Date Wed, 23 May 2018 12:57:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-9422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ruidong Li reassigned FLINK-9422:
---------------------------------

    Assignee: Ruidong Li

> Dedicated operator for UNION on streaming tables with time attributes
> ---------------------------------------------------------------------
>
>                 Key: FLINK-9422
>                 URL: https://issues.apache.org/jira/browse/FLINK-9422
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API &amp; SQL
>            Reporter: Fabian Hueske
>            Assignee: Ruidong Li
>            Priority: Minor
>
> 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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