hollow/src/main/java/com/netflix/hollow/tools/diff/HollowDiff.java
public HollowTypeDiff addTypeDiff(String type, String... primaryKeyPaths) {
        HollowTypeDiff typeDiff = new HollowTypeDiff(this, type, primaryKeyPaths);
        if(typeDiff.hasAnyData())
            typeDiffs.put(type, typeDiff);
        return typeDiff;
    }
public HollowTypeDiff addTypeDiff(String type, String... primaryKeyPaths) {
        HollowTypeDiff typeDiff = new HollowTypeDiff(this, type, primaryKeyPaths);
        if(typeDiff.hasAnyData())
            typeDiffs.put(type, typeDiff);
        return typeDiff;
    }
Add a type to be included in the diff report

@param type the type name
@param primaryKeyPaths the path(s) to the field(s) which comprise the type's primary key
@return the diff type