docs: public VoltXMLElement voltGetExpressionXML(Session session, Table table)
              throws HSQLParseException {
          resolveTableColumns(table);
          Expression parent = null; // As far as I can tell, this argument just gets passed around but never used !?
          resolveTypes(session, parent);
          return voltGetXML(new SimpleColumnContext(session, null, 0), null);
      }