[
https://issues.apache.org/jira/browse/IGNITE-8047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16421683#comment-16421683
]
Dmitriy Setrakyan commented on IGNITE-8047:
-------------------------------------------
Vladimir, looks like a very nice optimization. assigned it to version 2.5. If
2.5 is not possible, then feel free to reassign to 2.6.
> 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]
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
