presto-rcfile/src/main/java/io/prestosql/rcfile/RcFileReader.java/RcFileReader/validateWritePageChecksum
class RcFileReader:    private void validateWritePageChecksum()
            throws IOException
    {
        if (writeChecksumBuilder.isPresent()) {
            Block[] blocks = new Block[columns.length];
            for (int columnIndex = 0; columnIndex < columns.length; columnIndex++) {
                blocks[columnIndex] = readBlock(columnIndex);
            }
            writeChecksumBuilder.get().addPage(new Page(currentChunkRowCount, blocks));
        }
    }