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https://issues.apache.org/jira/browse/ARROW-840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16861465#comment-16861465
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Wes McKinney commented on ARROW-840:
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Actually, I'm wrong about that, because the mapped types have to be serialized
in arrow_to_pandas.cc, so there is some C++ development work to do there
> [Python] Provide Python API for creating user-defined data types that can
> survive Arrow IPC
> -------------------------------------------------------------------------------------------
>
> Key: ARROW-840
> URL: https://issues.apache.org/jira/browse/ARROW-840
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Python
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.14.0
>
>
> The user will provide:
> * Data type subclass that can indicate the physical storage type
> * "get state" and "set state" functions for serializing custom metadata to
> bytes
> * An optional function for "boxing" scalar values from the physical array
> storage
> Internally, this will build on an analogous C++ API for defining user data
> types
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