code: public void serializeToPagesWithoutLength(
  			BinaryRow record,
  			AbstractPagedOutputView out) throws IOException {
  		int remainSize = record.getSizeInBytes();
  		int posInSegOfRecord = record.getOffset();
  		int segmentSize = record.getSegments()[0].size();
  		for (MemorySegment segOfRecord : record.getSegments()) {
  			int nWrite = Math.min(segmentSize - posInSegOfRecord, remainSize);
  			assert nWrite > 0;
  			out.write(segOfRecord, posInSegOfRecord, nWrite);
  
  			// next new segment.
  			posInSegOfRecord = 0;
  			remainSize -= nWrite;
  			if (remainSize == 0) {
  				break;
  			}
  		}
  		checkArgument(remainSize == 0);
  	}
docs: Serialize row to pages without row length. The caller should make sure that the fixed-length
  parit can fit in output's current segment, no skip check will be done here.