in spark-job/src/main/java/org/apache/cassandra/diff/RangeStats.java [188:198]
public boolean isEmpty() {
return matchedPartitions.sum() == 0
&& mismatchedPartitions.sum() == 0
&& errorPartitions.sum() == 0
&& skippedPartitions.sum() == 0
&& onlyInSource.sum() == 0
&& onlyInTarget.sum() == 0
&& matchedRows.sum() == 0
&& matchedValues.sum() == 0
&& mismatchedValues.sum() == 0;
}