aocsa commented on a change in pull request #11019:
URL: https://github.com/apache/arrow/pull/11019#discussion_r706452208
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File path: cpp/src/arrow/compute/api_vector.h
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@@ -252,6 +292,21 @@ ARROW_EXPORT
Result<std::shared_ptr<Array>> NthToIndices(const Array& values, int64_t n,
ExecContext* ctx = NULLPTR);
+/// \brief Returns the first k elements ordered by `options.keys`.
+///
+/// Return a sorted array with its elements rearranged in such
+/// a way that the value of the element in k-th position (options.k) is in the
position it
+/// would be in a sorted datum ordered by `options.keys`. Null like values
will be not
+/// part of the output. Output is not guaranteed to be stable.
+///
+/// \param[in] datum datum to be partitioned
+/// \param[in] options options
+/// \param[in] ctx the function execution context, optional
+/// \return a datum with the same schema as the input
+ARROW_EXPORT
+Result<std::shared_ptr<Array>> SelectKUnstable(const Datum& datum,
SelectKOptions options,
+ ExecContext* ctx = NULLPTR);
Review comment:
because `k` is not specified.
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