default Catalog filterCatalog(Catalog catalog) throws MetaException {
    return catalog;
  }
Filter a catalog object.  Default implementation returns the passed in catalog.
@param catalog catalog to filter
@return filtered catalog
@throws MetaException something bad happened
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/MetaStoreFilterHook.java