void setCachedRowSet(CachedRowSet crs) {
           crsSync = (CachedRowSetImpl)crs;
    }
This function is package private,
i.e. cannot be accesses outside this package.
This is used to set the actual CachedRowSet
which is being synchronized to the database
src/main/java/org/replicadb/rowset/sun/rowset/internal/SyncResolverImpl.java