presto-main/src/main/java/io/prestosql/execution/buffer/BufferInfo.java/BufferInfo/toString
class BufferInfo:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("bufferId", bufferId)
                .add("finished", finished)
                .add("bufferedPages", bufferedPages)
                .add("pagesSent", pagesSent)
                .add("pageBufferInfo", pageBufferInfo)
                .toString();
    }