pitrou opened a new issue, #45190: URL: https://github.com/apache/arrow/issues/45190
### Describe the enhancement requested Arrow C++ already offers a `rank` function: https://arrow.apache.org/docs/cpp/compute.html#sorts-and-partitions It would be useful to add a percentile rank function according to this definition: https://en.wikipedia.org/wiki/Percentile_rank Proposed API: ```c++ /// \brief Percentile rank options class ARROW_EXPORT PercentileRankOptions : public FunctionOptions { public: explicit PercentileRankOptions(std::vector<SortKey> sort_keys = {}, NullPlacement null_placement = NullPlacement::AtEnd, double factor = 1.0); /// Convenience constructor for array inputs explicit PercentileRankOptions(SortOrder order, NullPlacement null_placement = NullPlacement::AtEnd, double factor = 1.0) : PercentileRankOptions({SortKey("", order)}, null_placement, factor) {} static constexpr char const kTypeName[] = "PercentileRankOptions"; static PercentileRankOptions Defaults() { return PercentileRankOptions(); } /// Column key(s) to order by and how to order by these sort keys. std::vector<SortKey> sort_keys; /// Whether nulls and NaNs are placed at the start or at the end NullPlacement null_placement; /// Factor to apply to the output. /// Use 1.0 for results in (0, 1), 100.0 for percentages, etc. double factor; }; ``` ### Component(s) C++ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
