presto-main/src/main/java/io/prestosql/sql/relational/InputReferenceExpression.java/InputReferenceExpression/InputReferenceExpression
class InputReferenceExpression:    public InputReferenceExpression(int field, Type type)
    {
        requireNonNull(type, "type is null");

        this.field = field;
        this.type = type;
    }