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From "Dmitriy Setrakyan (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (IGNITE-8047) SQL: optimize simple COUNT with DISTINCT query.
Date Sun, 01 Apr 2018 15:01:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-8047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitriy Setrakyan reassigned IGNITE-8047:
-----------------------------------------

    Assignee: Vladimir Ozerov

> SQL: optimize simple COUNT with DISTINCT query.
> -----------------------------------------------
>
>                 Key: IGNITE-8047
>                 URL: https://issues.apache.org/jira/browse/IGNITE-8047
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>            Reporter: Andrew Mashenkov
>            Assignee: Vladimir Ozerov
>            Priority: Major
>             Fix For: 2.5
>
>
> "Select COUNT(DISTINCT <expr>) From table;" will fetch full data set to reduce
node.
>  Looks like we can -add group by '<expr>'- push down DISTINCT into map query to
reduce network pressure.
> See details on nabble [1].
> [1] [http://apache-ignite-users.70518.x6.nabble.com/COUNT-DISTINCT-could-push-down-group-expressions-tt20782.html]



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