presto-hive/src/main/java/io/prestosql/plugin/hive/rcfile/HdfsRcFileDataSource.java/HdfsRcFileDataSource/readFully
class HdfsRcFileDataSource:    @Override
    public void readFully(long position, byte[] buffer, int bufferOffset, int bufferLength)
            throws IOException
    {
        long start = System.nanoTime();

        inputStream.readFully(position, buffer, bufferOffset, bufferLength);

        long readDuration = System.nanoTime() - start;
        stats.readDataBytesPerSecond(bufferLength, readDuration);

        readTimeNanos += readDuration;
        readBytes += bufferLength;
    }