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ARROW-2513: [Python] DictionaryType should give access to index type and dictionary array #1951

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crepererum wants to merge 2 commits into from
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ARROW-2513: [Python] DictionaryType should give access to index type and dictionary array #1951

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b703ecf
implement DictionaryType.index_type
crepererum Apr 27, 2018
788179c
implement DictionaryType.dictionary
crepererum Apr 26, 2018
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6 changes: 6 additions & 0 deletions python/pyarrow/tests/test_types.py
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Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,12 @@ def test_types_picklable():
assert pickle.loads(data) == ty


def test_dictionary_type():
ty = pa.dictionary(pa.int32(), pa.array(['a', 'b', 'c']))
assert ty.index_type == pa.int32()
assert ty.dictionary.to_pylist() == ['a', 'b', 'c']


def test_fields_hashable():
in_dict = {}
fields = [pa.field('a', pa.int64()),
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10 changes: 10 additions & 0 deletions python/pyarrow/types.pxi
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Expand Up @@ -184,6 +184,16 @@ cdef class DictionaryType(DataType):
def __get__(self):
return self.dict_type.ordered()

property index_type:

def __get__(self):
return pyarrow_wrap_data_type(self.dict_type.index_type())

property dictionary:

def __get__(self):
return pyarrow_wrap_array(self.dict_type.dictionary())


cdef class ListType(DataType):

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