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Posted to issues@ignite.apache.org by "Taras Ledkov (Jira)" <ji...@apache.org> on 2020/12/24 09:54:00 UTC

[jira] [Assigned] (IGNITE-13543) Calcite integration. Support of merge aggregates

     [ https://issues.apache.org/jira/browse/IGNITE-13543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Taras Ledkov reassigned IGNITE-13543:
-------------------------------------

    Assignee: Taras Ledkov

> Calcite integration. Support of merge 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
>  Remaining Estimate: 80h
>
> 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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