rok commented on code in PR #33925:
URL: https://github.com/apache/arrow/pull/33925#discussion_r1094413027
##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -72,4 +72,30 @@ same rules as laid out above, and provide backwards
compatibility guarantees.
Official List
=============
-No canonical extension types have been standardized yet.
+Fixed shape tensor
+==================
+
+* Extension name: `arrow.fixed_shape_tensor`.
+
+* The storage type of the extension: ``FixedSizeList`` where:
+
+ * **value_type** is the data type of individual tensors and
+ is an instance of ``pyarrow.DataType`` or ``pyarrow.Field``.
+ * **list_size** is the product of all the elements in tensor shape.
+
+* 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
Review Comment:
Consequently a consumer can derive their own strides for a different logical
view by (I think, didn't really check this):
```python
def strides(dim_names):
dim_indexes = np.argsort(dim_names, physical_dim_names)
view_shape = permute(shape, dim_indexes)
return compute_row_major_strides(view_shape)
```
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