presto-record-decoder/src/main/java/io/prestosql/decoder/raw/RawRowDecoderFactory.java/RawRowDecoderFactory/create
class RawRowDecoderFactory:    @Override
    public RowDecoder create(Map<String, String> decoderParams, Set<DecoderColumnHandle> columns)
    {
        return new RawRowDecoder(columns);
    }