I have a requirement where I have a input file in which there is a column named "Passed" in the data we have the count, sometimes what happens is the input doesn't have the "Passed" column, so I want to create a column named passed if the column is not present in the input file and keep the data as 0, otherwise if I have the passed column from the input I don't want any changes in the data, how can I perform this in Alteryx?