How to select specific columns alone using Query.make()

In guidewire, Query.make(EntityName).select() returns the entire column values, How should be the code if I need column specific result.

For eg, If I just need PolicyNumber , PublicID and ID alone from Policy table, How should I write the code?

var op = Query.make(PolicyPeriod).select({
    QuerySelectColumns.pathWithAlias("PolicyNumber", Paths.make(PolicyPeriod#PolicyNumber)),
    QuerySelectColumns.pathWithAlias("OfferNumber", Paths.make(PolicyPeriod#OfferNumber)),
    QuerySelectColumns.pathWithAlias("Id", Paths.make(PolicyPeriod#ID))
})

foreach(o in op){
  print(" Policy No : "+o.getColumn("PolicyNumber") +" | Offer No : "+o.getColumn("OfferNumber")+" | ID : "+o.getColumn("Id"))
}