jorisvandenbossche commented on a change in pull request #7546:
URL: https://github.com/apache/arrow/pull/7546#discussion_r445661743
##########
File path: python/pyarrow/_dataset.pyx
##########
@@ -845,6 +845,28 @@ cdef class RowGroupInfo:
def num_rows(self):
return self.info.num_rows()
+ @property
+ def statistics(self):
+ if not self.info.HasStatistics():
+ return None
+
+ cdef:
+ CStructScalar* c_statistics
+ CStructScalar* c_minmax
+
+ statistics = dict()
+ c_statistics = self.info.statistics().get()
+ for i in range(c_statistics.value.size()):
+ name = frombytes(c_statistics.type.get().field(i).get().name())
+ c_minmax = <CStructScalar*> c_statistics.value[i].get()
+
+ statistics[name] = {
+ 'min': pyarrow_wrap_scalar(c_minmax.value[0]).as_py(),
+ 'max': pyarrow_wrap_scalar(c_minmax.value[1]).as_py(),
+ }
+
+ return statistics
+
Review comment:
Do we want to expose the `statistics_expression` as well? (not fully
sure if it would have a use case, so maybe we should only do that if we have
one)
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