joellubi commented on code in PR #43458:
URL: https://github.com/apache/arrow/pull/43458#discussion_r1697440679
##########
python/pyarrow/tests/test_extension_type.py:
##########
@@ -1661,3 +1661,49 @@ def test_legacy_int_type():
batch = ipc_read_batch(buf)
assert isinstance(batch.column(0).type, LegacyIntType)
assert batch.column(0) == ext_arr
+
+
[email protected]("storage_type,storage", [
+ (pa.null(), [None] * 4),
+ (pa.int64(), [1, 2, None, 4]),
+ (pa.binary(), [None, b"foobar"]),
+ (pa.list_(pa.int64()), [[], [1, 2], None, [3, None]]),
+])
+def test_opaque_type(pickle_module, storage_type, storage):
+ opaque_type = pa.opaque(storage_type, "type", "vendor")
+ assert opaque_type.extension_name == "arrow.opaque"
+ assert opaque_type.storage_type == storage_type
+ assert opaque_type.type_name == "type"
+ assert opaque_type.vendor_name == "vendor"
+ assert "arrow.opaque" in str(opaque_type)
+
+ assert opaque_type == opaque_type
+ assert opaque_type != storage_type
+ assert opaque_type != pa.opaque(storage_type, "type2", "vendor")
+ assert opaque_type != pa.opaque(storage_type, "type", "vendor2")
+ assert opaque_type != pa.opaque(pa.decimal128(12, 3), "type", "vendor")
+
+ # Pickle roundtrip
+ result = pickle_module.loads(pickle_module.dumps(opaque_type))
+ assert result == opaque_type
+
+ # IPC roundtrip
+ tensor_arr_class = opaque_type.__arrow_ext_class__()
Review Comment:
`opaque_arr_class`?
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