RETURNING BULK COLLECT and database links

Looks like the nice PL/SQL facility for returning a set of updated rows is restricted when it comes to database links

(This tested on 12.1.0.1)

SQL> declare
  2    type int_list is table of number(12) index by pls_integer;
  3    l_results int_list;
  4
  5  begin
  6    update MY_TABLE b
  7    set b.my_col = ( select max(last_ddl_time) from user_objects@dblink where object_id = b.key_col)
  8    where b.my_col is null
  9    returning b.other_col bulk collect into l_results;
 10  end;
 11  /
declare
*
ERROR at line 1:
ORA-22816: unsupported feature with RETURNING clause
ORA-06512: at line 6

When we remove the database link, things revert to what we would expect

 
 
SQL> declare
  2    type int_list is table of number(12) index by pls_integer;
  3    l_acct int_list;
  4
  5  begin
  6    update MY_TABLE b
  7    set b.my_col = ( select max(last_ddl_time) from user_objects where object_id = b.key_col)
  8    where b.my_col is null
 10    returning b.other_col bulk collect into l_results;
 11  end;
 12  /
 
PL/SQL procedure successfully completed.

A workaround is to perform an equivalent SELECT to fetch the required data from the remote source (for example, into a temporary table), and then update locally.

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