presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/file/FileHiveMetastore.java/FileHiveMetastore/equals
class FileHiveMetastore:        @Override
        public boolean equals(Object o)
        {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }
            RoleGranteeTuple that = (RoleGranteeTuple) o;
            return Objects.equals(role, that.role) &&
                    Objects.equals(grantee, that.grantee);
        }