Hello, I'd like to propose the 'Opaque' canonical extension type. Prior discussion can be found at [1] and the proposal and implementations for C++, Go, Java, and Python can be found at [2]. The proposal is additionally reproduced below.
The vote will be open for at least 72 hours. [ ] +1 Accept this proposal [ ] +0 [ ] -1 Do not accept this proposal because... [1]: https://lists.apache.org/thread/8d5ldl5cb7mms21rd15lhpfrv4j9no4n [2]: https://github.com/apache/arrow/pull/41823 --- Opaque represents a type that an Arrow-based system received from an external (often non-Arrow) system, but that it cannot interpret. In this case, it can pass on Opaque to its clients to at least show that a field exists and preserve metadata about the type from the other system. Extension parameters: * Extension name: ``arrow.opaque``. * The storage type of this extension is any type. If there is no underlying data, the storage type should be Null. * Extension type parameters: * **type_name** = the name of the unknown type in the external system. * **vendor_name** = the name of the external system. * Description of the serialization: A valid JSON object containing the parameters as fields. In the future, additional fields may be added, but all fields current and future are never required to interpret the array. Developers **should not** attempt to enable public semantic interoperability of Opaque by canonicalizing specific values of these parameters.
