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Posted to jira@arrow.apache.org by "David Li (Jira)" <ji...@apache.org> on 2021/07/12 15:32:00 UTC

[jira] [Commented] (ARROW-13310) [C++] Implement hash_aggregate mode kernel

    [ https://issues.apache.org/jira/browse/ARROW-13310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17379231#comment-17379231 ] 

David Li commented on ARROW-13310:
----------------------------------

This is kind of tricky right now since we'll have to keep all the data materialized somewhere. The equivalent scalar aggregate kernel is actually a vector kernel and hence sidesteps this.

> [C++] Implement hash_aggregate mode kernel
> ------------------------------------------
>
>                 Key: ARROW-13310
>                 URL: https://issues.apache.org/jira/browse/ARROW-13310
>             Project: Apache Arrow
>          Issue Type: Improvement
>            Reporter: David Li
>            Priority: Major
>
> Requires ARROW-12759.
> We have a scalar aggregate kernel for this already and hopefully the implementation can be reused. Note, Pandas actually doesn't expose this in DataFrameGroupBy.



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