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https://issues.apache.org/jira/browse/ARROW-5005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17359389#comment-17359389
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Niranda Perera commented on ARROW-5005:
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I will take this up. From what I understand, we need to enable masked scalar
aggregates using the `ExecBatch::selection_vector`.
I have a couple of questions.
# Where/ at what point would the selection_vector be set to an ExecBatch?
# Should I change the kernels in aggregate_* files, so that they are
selection-vector-aware, or should we manage those as separate implementations?
> [C++] Implement support for using selection vectors in scalar aggregate
> function kernels
> ----------------------------------------------------------------------------------------
>
> Key: ARROW-5005
> URL: https://issues.apache.org/jira/browse/ARROW-5005
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Francois Saint-Jacques
> Assignee: Niranda Perera
> Priority: Major
>
> The aggregate kernels don't support mask (the result of a filter). Add the
> the following method to `AggregateFunction`.
> {code:c++}
> virtual Status ConsumeWithFilter(const Array& input, const Array& mask, void*
> state) const = 0;
> {code}
> The goal is to add support for AST similar to:
> {code:sql}
> SELECT AGG(x) FROM table WHERE pred;
> {code}
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