presto-rcfile/src/main/java/io/prestosql/rcfile/text/StructEncoding.java/StructEncoding/StructEncoding
class StructEncoding:    public StructEncoding(Type type, Slice nullSequence,
            byte[] separators,
            Byte escapeByte,
            boolean lastColumnTakesRest,
            List<TextColumnEncoding> structFields)
    {
        super(type, nullSequence, separators, escapeByte);
        this.lastColumnTakesRest = lastColumnTakesRest;
        this.structFields = structFields;
    }