viirya commented on code in PR #3305:
URL: https://github.com/apache/arrow-rs/pull/3305#discussion_r1044917851


##########
arrow-pyarrow-integration-testing/tests/test_sql.py:
##########
@@ -113,6 +109,10 @@ def assert_pyarrow_leak():
     ),
 ]
 
+_unsupported_pyarrow_types = [
+    pa.decimal256(76, 38),
+]
+
 
 @pytest.mark.parametrize("pyarrow_type", _supported_pyarrow_types, ids=str)
 def test_type_roundtrip(pyarrow_type):

Review Comment:
   Re-verified on local:
   
   ```python
   >>> import pyarrow as pa
   >>> dt = pa.union(
   ...         [pa.field("a", pa.binary(10)), pa.field("b", pa.string())],
   ...         mode=pa.lib.UnionMode_SPARSE,
   ...     ),
   >>> b = pa.array([], dt[0])
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
     File "pyarrow/array.pxi", line 320, in pyarrow.lib.array
     File "pyarrow/array.pxi", line 39, in pyarrow.lib._sequence_to_array
     File "pyarrow/error.pxi", line 144, in 
pyarrow.lib.pyarrow_internal_check_status
     File "pyarrow/error.pxi", line 121, in pyarrow.lib.check_status
   pyarrow.lib.ArrowNotImplementedError: sparse_union
   ```



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