private boolean isTableTransition(RegionInfo ri) {
    return this.previous == null || !this.previous.getTable().equals(ri.getTable());
  }
Returns True iff first row in hbase:meta or if we've broached a new table in hbase:meta
hbase-server/src/main/java/org/apache/hadoop/hbase/master/janitor/ReportMakingVisitor.java