[jira] [Created] (ARROW-1450) [Python] Raise proper error if custom serialization handler fails

[Philipp Moritz (JIRA)]

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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