tst> create table t1 as select object_id, object_name from all_objects;

Table created.

tst> create unique index pk_t1 on t1(object_id);

Index created.

tst> create index t1_idx_name on t1(object_name);

Index created.

tst> alter table t1 add primary key(object_id);

Table altered.

tst> exec dbms_stats.gather_table_stats(user, 'T1', cascade=>true, method_opt=>'for all columns size 1')

PL/SQL procedure successfully completed.

tst> select index_name, t.num_rows, t.blocks, clustering_factor
  2  from user_tables t, user_indexes i
  3  where t.table_name=i.table_name and t.table_name='T1';

INDEX_NAME                       NUM_ROWS     BLOCKS CLUSTERING_FACTOR
------------------------------ ---------- ---------- -----------------
T1_IDX_NAME                          6493         30              2372
PK_T1                                6493         30                93

tst> create table t1_bis as select * from t1 where 1=2;

Table created.

tst> alter table t1_bis modify (object_id null, object_name null);

Table altered.

tst> set serveroutput on
tst> declare n_errs number := 0;
  2  begin
  3   dbms_redefinition.start_redef_table(user, 'T1', 'T1_BIS', orderby_cols=>'OBJECT_NAME');
  4   dbms_redefinition.copy_table_dependents(user, 'T1', 'T1_BIS', num_errors=>n_errs);
  5   dbms_output.put_line('copy_table_dependents: num_errors='||n_errs);
  6  end;
  7  /
copy_table_dependents: num_errors=0

PL/SQL procedure successfully completed.

tst> exec dbms_redefinition.finish_redef_table(user, 'T1', 'T1_BIS')

PL/SQL procedure successfully completed.

tst> exec dbms_stats.gather_table_stats(user, 'T1', cascade=>true, method_opt=>'for all columns size 1')

PL/SQL procedure successfully completed.

tst> select index_name, t.num_rows, t.blocks, clustering_factor
  2  from user_tables t, user_indexes i
  3  where t.table_name=i.table_name and t.table_name='T1';

INDEX_NAME                       NUM_ROWS     BLOCKS CLUSTERING_FACTOR
------------------------------ ---------- ---------- -----------------
T1_IDX_NAME                          6493         30                26
PK_T1                                6493         30              3009

tst>