[jira] [Commented] (IGNITE-18205) Sql. Allow hash output distribution for aggregations

["Yury Gerzhedovich (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-18205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17641404#comment-17641404 ] 

Yury Gerzhedovich commented on IGNITE-18205:
--------------------------------------------

[~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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