presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/serializers/LexicoderRowSerializer.java/LexicoderRowSerializer/getByte
class LexicoderRowSerializer:    @Override
    public byte getByte(String name)
    {
        return ((Long) decode(TINYINT, getFieldValue(name))).byteValue();
    }