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https://issues.apache.org/jira/browse/IGNITE-8047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Mashenkov updated IGNITE-8047:
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Issue Type: Improvement (was: Bug)
> 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
> Priority: Major
>
> "Select COUNT(DISTINCT <expr>) From table;" will fetch full data set to
> reduce node.
> Looks like we can add group by '<expr>' 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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