presto-rcfile/src/main/java/io/prestosql/rcfile/text/BlockEncoding.java/BlockEncoding/BlockEncoding
class BlockEncoding:    public BlockEncoding(Type type, Slice nullSequence, byte[] separators, Byte escapeByte)
    {
        this.type = type;
        this.nullSequence = nullSequence;
        this.separators = separators;
        this.escapeByte = escapeByte;
    }