SQL JSON compliance

Simon has just pointed out to me that as a result of recent commits, a
number of things now should move from the unsupported table to the
supported table in features.sgml. In particular, it looks to me like all
of these should move:

T811           Basic SQL/JSON constructor functions      
T812           SQL/JSON: JSON_OBJECTAGG      
T813           SQL/JSON: JSON_ARRAYAGG with ORDER BY      
T814           Colon in JSON_OBJECT or JSON_OBJECTAGG      
T821           Basic SQL/JSON query operators      
T822           SQL/JSON: IS JSON WITH UNIQUE KEYS predicate      
T823           SQL/JSON: PASSING clause      
T824           JSON_TABLE: specific PLAN clause      
T825           SQL/JSON: ON EMPTY and ON ERROR clauses      
T826           General value expression in ON ERROR or ON EMPTY clauses
     
T827           JSON_TABLE: sibling NESTED COLUMNS clauses      
T828           JSON_QUERY      
T829           JSON_QUERY: array wrapper options      
T830           Enforcing unique keys in SQL/JSON constructor functions      
T838           JSON_TABLE: PLAN DEFAULT clause

If there's no objection I'll make it so.

cheers

andrew

--
Andrew Dunstan
EDB: https://www.enterprisedb.com