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Posted to issues@ignite.apache.org by "Taras Ledkov (Jira)" <ji...@apache.org> on 2020/11/19 13:52:00 UTC

[jira] [Updated] (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 updated IGNITE-13543:
----------------------------------
    Description: 
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. 

  was:To have a performance boost need to implement merge aggregates.


> 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
>            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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