rok commented on code in PR #41257:
URL: https://github.com/apache/arrow/pull/41257#discussion_r1571011302
##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -251,6 +251,24 @@ Variable shape tensor
Values inside each **data** tensor element are stored in
row-major/C-contiguous
order according to the corresponding **shape**.
+.. _json_extension:
+
+JSON
+====
+
+* Extension name: `arrow.json`.
+
+* The storage type of this extension is ``StringArray`` or
+ ``StringViewArray``.
+
+* Extension type parameters:
+
+ This type does not have any parameters.
+
+* Description of the serialization:
+
+ Metadata is an empty string.
Review Comment:
Year, that makes sense as we are promising [backwards
compatibility](https://arrow.apache.org/docs/format/CanonicalExtensions.html#making-modifications):
> Making Modifications
> Like standard Arrow data types, canonical extension types should be
considered stable once standardized. Modifying a canonical extension type (for
example to expand the set of parameters) should be an exceptional event, follow
the same rules as laid out above, and provide backwards compatibility
guarantees.
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