Wes McKinney created ARROW-840:
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Summary: [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
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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