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From "Dian Fu (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (FLINK-8739) Optimize runtime support for distinct filter
Date Mon, 03 Dec 2018 02:09:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-8739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dian Fu reassigned FLINK-8739:
------------------------------

    Assignee: Dian Fu

> Optimize runtime support for distinct filter
> --------------------------------------------
>
>                 Key: FLINK-8739
>                 URL: https://issues.apache.org/jira/browse/FLINK-8739
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API &amp; SQL
>            Reporter: Rong Rong
>            Assignee: Dian Fu
>            Priority: Major
>
> Possible optimizaitons:
> 1. Decouple distinct map and actual accumulator so that they can separately be created
in codegen.
> 2. Reuse same distinct accumulator for filtering, e.g. `SELECT COUNT(DISTINCT(a)), SUM(DISTINCT(a))`
should reuse the same distinct map.



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