lidavidm commented on code in PR #41823:
URL: https://github.com/apache/arrow/pull/41823#discussion_r1639807409
##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -283,6 +283,155 @@ UUID
A specific UUID version is not required or guaranteed. This extension
represents
UUIDs as FixedSizeBinary(16) with big-endian notation and does not
interpret the bytes in any way.
+Unknown
+=======
+
+Unknown represents a type or array that an Arrow-based system received from an
+external (often non-Arrow) system, which it cannot interpret itself or did not
+have support for in advance. In this case, it can pass on Unknown to its own
+clients to communicate that a field exists, but that it cannot interpret the
+field or data.
+
+Extension parameters:
+
+* Extension name: ``arrow.unknown``.
+
+* The storage type of this extension is any type. If there is no underlying
+ data, the storage type should be Null. If there is data, the storage type
+ should preferably be binary or fixed-size binary, but may be any type.
Review Comment:
Originally @pitrou's suggestion IIRC, but most likely if you have
uninterpretable data it's probably a binary blob.
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