MODIFY PARTITION partition
{ partition_attributes 
| add_table_subpartition_clause
| COALESCE [SUBPARTITION] [update_global_index_clause] [parallel_clause] 
| alter_table_mapping_clause
| { ADD | DROP } VALUES ( partition_value [, partition_value]... )
| [REBUILD] UNUSABLE LOCAL INDEXES
}

For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.