presto-orc/src/main/java/io/prestosql/orc/reader/DoubleColumnReader.java/DoubleColumnReader/readNonNullBlock
class DoubleColumnReader:    private Block readNonNullBlock()
            throws IOException
    {
        verifyNotNull(dataStream);
        long[] values = new long[nextBatchSize];
        dataStream.next(values, nextBatchSize);
        return new LongArrayBlock(nextBatchSize, Optional.empty(), values);
    }