Philipp Moritz created ARROW-1450:
-------------------------------------
Summary: [Python] Raise proper error if custom serialization
handler fails
Key: ARROW-1450
URL: https://issues.apache.org/jira/browse/ARROW-1450
Project: Apache Arrow
Issue Type: Bug
Reporter: Philipp Moritz
At the moment, the following fails:
```python
def test_serializaton_callback_error():
class TempClass(object):
pass
# Have a SerializationContext but TempClass is not
# registered
serialization_context = pa.SerializationContext()
with pytest.raises(pa.SerializationCallbackError):
serialized_object = pa.serialize(TempClass, serialization_context)
```
This is because serialize will raise a generic ArrowException instead of a
SerializationCallbackError. We do need the latter because it contains the
object that couldn't be serialized, which is important to give good error
messages; in the case of Ray we sometimes want use the object to register
additional serialization callbacks on the fly to make the user experience
smoother.
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