rouault commented on code in PR #41257:
URL: https://github.com/apache/arrow/pull/41257#discussion_r1573296182
##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -251,6 +251,27 @@ 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
+ or ``LargeStringArray`` or ``StringViewArray``.
+ Only UTF-8 encoded JSON is supported.
+
+* Extension type parameters:
+
+ This type does not have any parameters.
+
+* Description of the serialization:
+
+ Metadata is either an empty string or a JSON string with an empty object.
+ In the future, additional fields may be added, but they are not required
+ to interpret the array.
Review Comment:
An interesting metadata that could be put is ``{"schema": { ... insert here
JSON schema .... }}`` to express contraints on the payload
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