Flag New Columns

[gero]

I have this sample wf, the text input is the original list of columns, the file input has an extra column added which the join is taking out at the end. 
Idea is that the file represents this extra column coming in but i dont want to use a static text input to do that. Is there an alternative to highlight new incomiing columns ?

[binuacs · Accepted solution]

@gero, 

how will you find the new columns in the new file without knowing the original column names?