pitrou commented on code in PR #13327:
URL: https://github.com/apache/arrow/pull/13327#discussion_r892270235
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python/pyarrow/_compute.pyx:
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@@ -2047,6 +2047,60 @@ class RandomOptions(_RandomOptions):
self._set_options(length, initializer)
+cdef class _RankOptions(FunctionOptions):
+
+ _tiebreaker_map = {
+ "min": CRankOptionsTiebreaker_Min,
+ "max": CRankOptionsTiebreaker_Max,
+ "first": CRankOptionsTiebreaker_First,
+ "dense": CRankOptionsTiebreaker_Dense,
+ }
+
+ def _set_options(self, sort_keys, null_placement, tiebreaker):
+ cdef vector[CSortKey] c_sort_keys
+ for name, order in sort_keys:
+ c_sort_keys.push_back(
+ CSortKey(tobytes(name), unwrap_sort_order(order))
+ )
+ try:
+ self.wrapped.reset(
+ new CRankOptions(c_sort_keys,
unwrap_null_placement(null_placement), self._tiebreaker_map[tiebreaker])
+ )
+ except KeyError:
+ _raise_invalid_function_option(tiebreaker, "tiebreaker")
+
+
+class RankOptions(_RankOptions):
+ """
+ Options for the `rank` function.
+
+ Parameters
+ ----------
+ sort_keys : sequence of (name, order) tuples, optional
+ Names of field/column keys to sort the input on,
+ along with the order each field/column is sorted in.
+ Accepted values for `order` are "ascending", "descending".
Review Comment:
> The default is injecting an empty field and applying Ascending, right?
Yes!
> So would you add that the default is just "ascending" or the default is
[("", "ascending")]
The latter, probably.
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