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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:
-------------------------------------
Description:
"Select COUNT(DISTINCT field) From table;" fetch full data set to reduce node.
Looks like we can add group by 'field' to map query to reduce fetched dataset
size.
See details on nabble [1].
[1]
http://apache-ignite-users.70518.x6.nabble.com/COUNT-DISTINCT-could-push-down-group-expressions-tt20782.html
> SQL: optimize simple COUNT with DISTINCT query.
> -----------------------------------------------
>
> Key: IGNITE-8047
> URL: https://issues.apache.org/jira/browse/IGNITE-8047
> Project: Ignite
> Issue Type: Bug
> Components: sql
> Reporter: Andrew Mashenkov
> Priority: Major
>
> "Select COUNT(DISTINCT field) From table;" fetch full data set to reduce node.
> Looks like we can add group by 'field' to map query to reduce fetched dataset
> size.
> 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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