jorisvandenbossche commented on code in PR #41257:
URL: https://github.com/apache/arrow/pull/41257#discussion_r1584195785
##########
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:
> 3\. Specialized metadata used internally (e.g. BigQuery might want to
store what fields were columnarized, so we could reinstantiate it if the user
exports data and then reimports it back).
Note that for such internal metadata, you are always free that any other key
to the field metadata of the column, and you don't necessarily have to add that
to the value of the `ARROW:extension:metadata` key
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
