Add feature flag for pyarrow UUID helper detection

Implement a feature flag to check for UUID helper
in pyarrow. Add conditional skip to the UUID extension
UDF chaining test when the helper is unavailable,
retaining original assertions for supported environments.

Author: kosiew

python/tests/test_udf.py

@@ -22,6 +22,9 @@
 from datafusion import column, udf
 
 
+UUID_EXTENSION_AVAILABLE = hasattr(pa, "uuid")
+
+
 @pytest.fixture
 def df(ctx):
     # create a RecordBatch and a new DataFrame from it
@@ -128,6 +131,10 @@ def udf_with_param(values: pa.Array) -> pa.Array:
     assert result == pa.array([False, True, True])
 
 
+@pytest.mark.skipif(
+    not UUID_EXTENSION_AVAILABLE,
+    reason="PyArrow uuid extension helper unavailable",
+)
 def test_uuid_extension_chain(ctx) -> None:
     uuid_type = pa.uuid()
     uuid_field = pa.field("uuid_col", uuid_type)