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https://issues.apache.org/jira/browse/ARROW-13598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448155#comment-17448155
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David Li commented on ARROW-13598:
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If it's not used, I think we may as well remove it. We can always restore it if
it does turn out to be useful. It seems to me, though, that instead of having a
Datum contain more Datums, we'd rather instead have a stream of Datums (as
indeed the query engine effectively does).
> [C++] Deprecate Datum::COLLECTION
> ---------------------------------
>
> Key: ARROW-13598
> URL: https://issues.apache.org/jira/browse/ARROW-13598
> Project: Apache Arrow
> Issue Type: Task
> Components: C++
> Reporter: Antoine Pitrou
> Priority: Minor
> Fix For: 7.0.0
>
>
> It looks like "collection" datums are not used anywhere. Where we want to
> return several pieces of data, we generally return a Struct array or scalar
> wrapping them.
> Perhaps we should simply deprecate or even remove them.
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