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https://issues.apache.org/jira/browse/IGNITE-18205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17641404#comment-17641404
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Yury Gerzhedovich commented on IGNITE-18205:
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[~korlov], LGTM!
> Sql. Allow hash output distribution for aggregations
> ----------------------------------------------------
>
> Key: IGNITE-18205
> URL: https://issues.apache.org/jira/browse/IGNITE-18205
> Project: Ignite
> Issue Type: Improvement
> Components: sql
> Reporter: Konstantin Orlov
> Assignee: Konstantin Orlov
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0.0-beta2
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Currently, we allow only single output distribution for aggregates, but looks
> like if we have hash input distribution and all grouping set contains all of
> the distribution keys we can make aggregation on remote nodes and produce
> hash output distribution with the same keys. This will reduce memory
> consumption on the initiator node and make some other optimizations possible.
> Reference implementation can be found here: IGNITE-16396
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