pitrou commented on code in PR #33925:
URL: https://github.com/apache/arrow/pull/33925#discussion_r1091787800


##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -72,4 +72,26 @@ 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``.

Review Comment:
   Can you describe the value type and the size of the fixed-size list?



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