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https://issues.apache.org/jira/browse/ARROW-5022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16802751#comment-16802751
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Francois Saint-Jacques commented on ARROW-5022:
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I'm not sure we want to make kernels support all datum combination. This will
likely be delegated to the query engine.
> [C++] Implement more "Datum" types for AggregateKernel
> ------------------------------------------------------
>
> Key: ARROW-5022
> URL: https://issues.apache.org/jira/browse/ARROW-5022
> Project: Apache Arrow
> Issue Type: Improvement
> Reporter: Philipp Moritz
> Priority: Major
>
> Currently it gives the following error if the datum isn't an array:
> {code:java}
> AggregateKernel expects Array datum{code}
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