Wes McKinney created ARROW-5342:
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Summary: [Format] Formalize extension type metadata in IPC protocol
Key: ARROW-5342
URL: https://issues.apache.org/jira/browse/ARROW-5342
Project: Apache Arrow
Issue Type: New Feature
Components: Format
Reporter: Wes McKinney
Fix For: 0.14.0
On the heels of ARROW-585 and ARROW-5255, it has been proposed to add reserved
keys to {{custom_metadata}} on the {{Field}} Flatbuffer type to pass along the
name of a custom/user-defined data type and any serialized data required to
reconstruct that data type.
The objective of this is to enable library users to define new data types that
are embedded semantically in pre-defined Arrow data types like Binary or
FixedSizeBinary. For example, UUID could be defined as an extension type atop
FixedSizeBinary(16) (though UUID may be important enough to formalize as a
logical type at some point...)
I will propose language to add to Metadata.rst and start a discussion on the
mailing list to possibly call a vote
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