title: concat 2 column in 1 column with odi 12c in design section
body: <p>I'm new in odi 12c and I want to merge or concat 2 column in 1 column.
  I have employee table which has first_name,last_name and ID. I want to map them in another table but full_name and ID.
  in sql it is: <code>employees.first_name||''||employees.last_name as full_name</code>.
  I don't know which component is usefull for doing it(aggregate,set,...?) .</p>