title: Pentaho dynamic merge key fields
body: <p>I am trying to perform a merge in Kettle Pentaho. One table will be merged with exactly the same table on another database. The table name to be merged will be passed as an argument so I will have a config table in my db that will contain the column(s) on which the 2 instances of the table have to be joined on.</p>
  
  <p>My question is, can I do a merge with dynamic key fields? I could have a separate step/transformation that selects the names of the columns to be used as keys from the config table.</p>
  
  <p>Thanks in advance!</p>