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https://issues.apache.org/jira/browse/ARROW-13309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17405230#comment-17405230
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David Li commented on ARROW-13309:
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[~icook] I think if we want to have one, we certainly can, but we'd be
accumulating all data in-memory until we figure out a design for spilling to
disk. That may be fine? I would only worry about potentially wasting work if we
come up with a drastically different design for spilling to disk.
And we'd want to refactor the scalar aggregate to actually be a scalar
aggregate kernel again (right now it is actually a vector function and hence
not usable in an aggregation).
> [C++] Implement hash_aggregate exact quantile kernel
> ----------------------------------------------------
>
> Key: ARROW-13309
> URL: https://issues.apache.org/jira/browse/ARROW-13309
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: David Li
> Priority: Major
> Labels: kernel
> Fix For: 6.0.0
>
>
> Requires ARROW-12759.
> We have a scalar aggregate kernel for this already and hopefully the
> implementation can be reused.
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