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https://issues.apache.org/jira/browse/ARROW-6179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16903265#comment-16903265
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Micah Kornfield commented on ARROW-6179:
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How would the two options be chosen?
> [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
> Priority: Major
>
> 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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