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https://issues.apache.org/jira/browse/ARROW-3120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16765129#comment-16765129
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Wes McKinney commented on ARROW-3120:
-------------------------------------
Removed from 0.13. The currently Sum kernel implementation is not stateful. I
suggest we wait to determine how parallel execution / synchronization will be
managed for now (until we have more aggregations implemented, and begin to
develop a runtime execution environment)
> [C++] Thread-safe incremental Sum aggregator
> --------------------------------------------
>
> Key: ARROW-3120
> URL: https://issues.apache.org/jira/browse/ARROW-3120
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Francois Saint-Jacques
> Priority: Major
> Labels: analytics
>
> The general API for aggregation should be something like
> {code}
> Aggregator* aggregator = ...;
> const Array& chunk = ...;
> RETURN_NOT_OK(aggregator->Update(chunk));
> {code}
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