public boolean hasMergeRegions(RegionInfo region) throws IOException {
    return CatalogFamilyFormat.hasMergeRegions(getRegionCatalogResult(region).rawCells());
  }
Check whether the given {@code region} has any 'info:merge*' columns.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStateStore.java