presto-parser/src/main/java/io/prestosql/sql/tree/Use.java/Use/Use
class Use:    private Use(Optional<NodeLocation> location, Optional<Identifier> catalog, Identifier schema)
    {
        super(location);
        requireNonNull(catalog, "catalog is null");
        requireNonNull(schema, "schema is null");
        this.catalog = catalog;
        this.schema = schema;
    }