rok commented on code in PR #33925:
URL: https://github.com/apache/arrow/pull/33925#discussion_r1090656772
##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -72,4 +72,24 @@ 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: ``FixedSizeList``.
+
+* Extension type parameters:
+
+ * **value_type** = Arrow DataType of the tensor elements
+ * **shape** = shape of the contained tensors as a tuple
+ * **is_row_major** = boolean indicating the order of elements in memory
+
+* Description of the serialization:
+
+ The metadata must be a valid JSON object including:
+
+ * shape of the contained tensors as an array with key “shape”,
+ * string defining the order of elements in memory with key “order”.
Review Comment:
```suggestion
* boolean indicating the order of elements in memory with key “order”.
```
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