anchor.diff:      | COMPILE
       | enable_or_disable
       | UNUSABLE
  -    | (VISIBLE | INVISIBLE)
  +    | visible_or_invisible
       | RENAME TO new_index_name
       | COALESCE
  -    | (MONITORING | NOMONITORING) USAGE
  +    | monitoring_nomonitoring USAGE
       | UPDATE BLOCK REFERENCES
       | alter_index_partitioning
  +    ;
  +
  +visible_or_invisible
  +    : VISIBLE
  +    | INVISIBLE
  +    ;
  +
  +monitoring_nomonitoring
  +    : MONITORING
  +    | NOMONITORING
       ;
   
   rebuild_clause
  
positive.code: 
  modify_index_partition
      : MODIFY PARTITION partition_name
          (modify_index_partitions_ops+
          | PARAMETERS '(' odci_parameters ')'
          | COALESCE
          | UPDATE BLOCK REFERENCES
  
negative.code: 
  //https://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_1010.htm#SQLRF00805  
  alter_index
      : ALTER INDEX index_name (alter_index_ops_set1 | alter_index_ops_set2) ';'
      ;
  
  alter_index_ops_set1
      : ( deallocate_unused_clause
        | allocate_extent_clause
        | shrink_clause
        | parallel_clause
  