bkietz commented on a change in pull request #8894:
URL: https://github.com/apache/arrow/pull/8894#discussion_r552843114
##########
File path: cpp/src/arrow/dataset/partition.h
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@@ -294,5 +285,22 @@ class ARROW_DS_EXPORT PartitioningOrFactory {
std::shared_ptr<Partitioning> partitioning_;
};
+/// \brief Assemble lists of indices of identical rows.
+///
+/// \param[in] by A StructArray whose columns will be used as grouping
criteria.
+/// \return A StructArray mapping unique rows (in field "values", represented
as a
+/// StructArray with the same fields as `by`) to lists of indices where
+/// that row appears (in field "groupings").
Review comment:
I'll address this in ARROW-10247
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