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https://issues.apache.org/jira/browse/ARROW-12710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17361024#comment-17361024
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Antoine Pitrou commented on ARROW-12710:
----------------------------------------
Is our current scalar aggregation has deterministic output order, then we don't
need the "order_by" option.
> [C++] String concatenate aggregate kernel
> -----------------------------------------
>
> Key: ARROW-12710
> URL: https://issues.apache.org/jira/browse/ARROW-12710
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Ian Cook
> Priority: Major
>
> Like MySQL/Impala {{group_concat}} and PostgreSQL {{string_agg}}. Takes a
> string array and a separator (possibly optional?) and returns one scalar
> string (one per group in the case of group aggregation) representing all the
> string values in the array concatenated together, with the separator added
> between each pair of concatenated values.
> For example, in the case of no grouping and using separator {{"-"}}, this
> would take input:
> {code}
> Array<string>
> [
> "foo",
> "bar",
> "baz"
> ]
> {code}
> and return the following string scalar as output:
> {code}
> "foo-bar-baz"
> {code}
>
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