/**
* Adds an expression and returns a reference name. If an alias is given, it specifies the alias
* as an reference name.
*/
public String addNamedExpr(NamedExpr namedExpr) throws PlanningException {
if (namedExpr.hasAlias()) {
return addExpr(namedExpr.getExpr(), namedExpr.getAlias());
} else {
return addExpr(namedExpr.getExpr());
}
}
