@Nullable
  public static RegionInfo getRegionInfo(final Result r, byte[] qualifier) {
    Cell cell = r.getColumnLatestCell(HConstants.CATALOG_FAMILY, qualifier);
    if (cell == null) {
      return null;
    }
    return RegionInfo.parseFromOrNull(cell.getValueArray(), cell.getValueOffset(),
      cell.getValueLength());
  }
Returns the RegionInfo object from the column {@link HConstants#CATALOG_FAMILY} and
<code>qualifier</code> of the catalog table result.
@param r         a Result object from the catalog table scan
@param qualifier Column family qualifier
@return An RegionInfo instance or null.
hbase-client/src/main/java/org/apache/hadoop/hbase/CatalogFamilyFormat.java