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https://issues.apache.org/jira/browse/IGNITE-13543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17271217#comment-17271217
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Konstantin Orlov commented on IGNITE-13543:
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[~tledkov-gridgain], I left few comment, please see PR
> Calcite integration. Sort-based aggregates
> ------------------------------------------
>
> Key: IGNITE-13543
> URL: https://issues.apache.org/jira/browse/IGNITE-13543
> Project: Ignite
> Issue Type: New Feature
> Components: sql
> Reporter: Yury Gerzhedovich
> Assignee: Taras Ledkov
> Priority: Critical
> Original Estimate: 80h
> Time Spent: 0.5h
> Remaining Estimate: 79.5h
>
> To have a performance boost need to implement merge aggregates.
> The merge aggregate is applied for sorted input of the aggregate.
> In this case only one aggregation group is stored at the memory.
> Also the input of the aggregate may be sorted by force.
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