Support using JSON as GROUP BY

Enhancement

MySQL root@127.1:d1> select event_date from tjson group by event_date;
(1064, 'Getting analyzing error. Detail message: Type (nested) percentile/hll/bitmap/json not support group-by.')

JSON is currently not supported in the GROUP BY clause, but enabling this functionality could be beneficial for certain scenarios.

To implement GROUP BY support for JSON, a stable hash function and comparison function are required. This can be achieved using asymmetric hash mixing techniques, such as XOR, which is already implemented in JsonValue::hash.