presto-spi/src/main/java/io/prestosql/spi/block/ByteArrayBlock.java/ByteArrayBlock/toString
class ByteArrayBlock:    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder("ByteArrayBlock{");
        sb.append("positionCount=").append(getPositionCount());
        sb.append('}');
        return sb.toString();
    }