[jira] [Created] (ARROW-5931) [C++] Extend extension types facility to provide for serialization and deserialization in IPC roundtrips

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

Wes McKinney created ARROW-5931:
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             Summary: [C++] Extend extension types facility to provide for serialization and deserialization in IPC roundtrips
                 Key: ARROW-5931
                 URL: https://issues.apache.org/jira/browse/ARROW-5931
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 1.0.0


A use case here is when an array needs to reference some external data. For example, suppose that we wanted to implement an array that references a sequence of Python objects as {{PyObject**}}. Obviously, a {{PyObject*}} must be managed by the Python interpreter.

For a vector of some {{T*}} to be sent through the IPC machinery, it must be embedded in some Arrow type on the wire. For example, the memory resident version of {{PyObject**} might be 8-bytes per value (1 pointer per value) while being serialized to the binary IPC protocol, such {{PyObject*}} values must be serialized into an Arrow Binary type.





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