}
private void visit(RelationalExprDescr descr) {
int currentOrderNumber = orderNumber.next();
String fieldName = visit(descr.getLeft());
Operator operator = Operator.determineOperator(descr.getOperator(), descr.isNegated());
String value = visit(descr.getRight());
setField(descr,fieldName);
if (isAVariableRestriction(value)) {