docs: private void handleExpressionQuery(final TSDB tsdb, final HttpQuery query) {
      final net.opentsdb.query.pojo.Query v2_query = 
          JSON.parseToObject(query.getContent(), net.opentsdb.query.pojo.Query.class);
      v2_query.validate();
  
      checkAuthorization(tsdb, query.channel(), v2_query);
  
      final QueryExecutor executor = new QueryExecutor(tsdb, v2_query);
      executor.execute(query);
    }