title: Adding two extra columns to input data - Pentaho Kettle
body: <p>I am working on a transformation step for Pentaho Kettle. It selects several input columns and based on that adds two new columns during transformation. I am unable to understand (based on code from other plugins), how I can add the two new columns so that 1) steps downstream are aware of these columns and 2) i can push the transformed data into these columns.</p>
  
  <p><img src="https://i.stack.imgur.com/XRvyt.png" alt="transformation"></p>
  
  <p>Thanks in advance.</p>