MODIFY partition_extended_name
   { partition_attributes
   | { add_range_subpartition
     | add_hash_subpartition
     | add_list_subpartition
     }
   | COALESCE SUBPARTITION
        [ update_index_clauses ]
        [ parallel_clause ]
   | alter_mapping_table_clause
   | [ REBUILD ] UNUSABLE LOCAL INDEXES
   }