default List<String> filterCatalogs(List<String> catalogs) throws MetaException {
    return catalogs;
  }
Filter a list of catalog names.  Default implementation returns the passed in list.
@param catalogs list of catalog names.
@return filtered list of catalog names.
@throws MetaException something bad happened.
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/MetaStoreFilterHook.java