You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@flink.apache.org by "Fabian Hueske (JIRA)" <ji...@apache.org> on 2018/10/04 11:36:00 UTC

[jira] [Updated] (FLINK-9422) Dedicated DISTINCT operator for streaming tables with time attributes

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

Fabian Hueske updated FLINK-9422:
---------------------------------
    Summary: Dedicated DISTINCT operator for streaming tables with time attributes  (was: Dedicated operator for UNION on streaming tables with time attributes)

> 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 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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)