[jira] [Created] (ARROW-6179) [C++] ExtensionType subclass for "unknown" types?

["Joris Van den Bossche (JIRA)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-6179:
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             Summary: [C++] ExtensionType subclass for "unknown" types?
                 Key: ARROW-6179
                 URL: https://issues.apache.org/jira/browse/ARROW-6179
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Joris Van den Bossche


In C++, when receiving IPC with extension type metadata for a type that is unknown (the name is not registered), we currently fall back to returning the "raw" storage array. The custom metadata (extension name and metadata) is still available in the Field metadata.

Alternatively, we could also have a generic {{ExtensionType}} class that can hold such "unknown" extension type (eg {{UnknowExtensionType}} or {{GenericExtensionType}}), keeping the extension name and metadata in the Array's type. 

This could be a single class where several instances can be created given a storage type, extension name and optionally extension metadata. It would be a way to have an unregistered extension type.



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