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https://issues.apache.org/jira/browse/ARROW-12710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ian Cook updated ARROW-12710:
-----------------------------
Description:
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}
was: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.
> [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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