rok commented on code in PR #33925:
URL: https://github.com/apache/arrow/pull/33925#discussion_r1090990827


##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -72,4 +72,28 @@ same rules as laid out above, and provide backwards 
compatibility guarantees.
 Official List
 =============
 
-No canonical extension types have been standardized yet.
+Fixed size tensor
+=================
+
+* Extension name: `arrow.fixed_size_tensor`.
+
+* The storage type of the extension: ``List``.
+
+* Extension type parameters:
+
+  * **value_type** = pyarrow DataType of the tensor elements
+  * **shape** = shape of the contained tensors as a tuple
+  * **order** = string indicating the order of elements in memory;
+    ā€˜C’ for row major order and ā€˜F’ for column major order

Review Comment:
   @jorisvandenbossche any thoughts on `is_row_major` vs `order`?



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