jsonb operators broken on cold data, and the documented ::jsonb workaround doesn't work #124

SELECT coldfront.create_iceberg_table('public','jtest',
  '[{"name":"id","type":"bigint"},{"name":"data","type":"jsonb"}]'::jsonb);
INSERT INTO jtest VALUES (1, '{"k":1,"a":[1,2]}'::jsonb);

SELECT data->>'k'     FROM jtest WHERE id=1;    -- works: 1
SELECT data#>'{a,0}'  FROM jtest WHERE id=1;    -- ERROR: Parser Error at "#"
SELECT id FROM jtest WHERE (data::jsonb) ? 'k'; -- ERROR: operator does not exist: json ? text

**Expected:** #> returns 1; the ::jsonb cast makes ? return 1.
**Actual:** both error. The column reads back as json (not jsonb) through the view, so the cast can't help.