jorisvandenbossche commented on a change in pull request #10661:
URL: https://github.com/apache/arrow/pull/10661#discussion_r670338982
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File path: python/pyarrow/_dataset.pyx
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@@ -2083,6 +2102,27 @@ cdef class DirectoryPartitioning(Partitioning):
return PartitioningFactory.wrap(
CDirectoryPartitioning.MakeFactory(c_field_names, c_options))
+ @property
+ def dictionaries(self):
+ """
+ The unique values for each partition field, if available.
+
+ Those values are only available if the Partitioning object was
+ created through dataset discovery from a PartitioningFactory, or
+ if the dictionaries were manually specified in the constructor.
+ If not available, this returns None.
+ """
+ cdef vector[shared_ptr[CArray]] c_arrays
+ c_arrays = self.directory_partitioning.dictionaries()
+ res = []
+ for arr in c_arrays:
+ if arr.get() == nullptr:
+ # Partitioning object has not been created through
+ # inspected Factory
+ return None
+ res.append(pyarrow_wrap_array(arr))
Review comment:
`pyarrow_wrap_array` will in that case raise an error (it checks for
`arr` being NULL), so at least it won't segfault I think
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