Stop supporting json query without using helper function

lib/dialects/postgres/query-generator.js

@@ -785,8 +785,6 @@ module.exports = (function() {
         // impossible to write queries in portable SQL if tables are created in
         // this way. Hence, we strip quotes if we don't want case sensitivity.
         return Utils.removeTicks(identifier, '"');
-      } else if (_.any(['->', '->>', '#>'], _.partial(_.contains, identifier))) { // Postgres json operators
-        return identifier;
       } else {
         return Utils.addTicks(identifier, '"');
       }