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

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-1450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney reassigned ARROW-1450:
-----------------------------------

    Assignee: Philipp Moritz

> [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
>            Assignee: Philipp Moritz
>             Fix For: 0.7.0
>
>
> At the moment, the following fails:
> {code:none}
> 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)
> {code}
> 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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