wjones127 commented on a change in pull request #12007:
URL: https://github.com/apache/arrow/pull/12007#discussion_r777643176
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File path: python/pyarrow/tests/test_array.py
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@@ -2643,6 +2643,30 @@ def test_fixed_size_list_array_flatten():
assert arr2.flatten().flatten().equals(arr0)
+def test_map_array_flatten():
+ ty = pa.map_(pa.utf8(), pa.int32())
+ ty_values = pa.struct([pa.field("key", pa.utf8(), nullable=False),
+ pa.field("value", pa.int32())])
+ a = pa.array([[('a', 1), ('b', 2)], [('c', 3)]], type=ty)
+
+ assert a.values.type.equals(ty_values)
+ assert a.values == pa.array([
+ {'key': 'a', 'value': 1},
+ {'key': 'b', 'value': 2},
+ {'key': 'c', 'value': 3},
+ ], type=ty_values)
+ assert a.keys.equals(pa.array(['a', 'b', 'c']))
+ assert a.items.equals(pa.array([1, 2, 3], type=pa.int32()))
+
+ assert pa.ListArray.from_arrays(a.offsets, a.keys).equals(
+ pa.array([['a', 'b'], ['c']]))
+ assert pa.ListArray.from_arrays(a.offsets, a.items).equals(
+ pa.array([[1, 2], [3]], type=pa.list_(pa.int32())))
+
+ with pytest.raises(NotImplementedError):
+ a.flatten()
Review comment:
We don't have a compute kernel for flatten that takes a map, but I think
that's *okay* since typically you want the flattened keys and items, which you
*can* get.
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