The Column Generator stage adds columns to incoming data and generates mock data for these columns for each data row processed. The new data set is then output..
Let us two table x and Y . and you are doing funnel. X file is having only 2 columns and Y file is having 3 columns.
While doing funnel metadata should be same. in order to achieve this include one column to X file and next use this column generator stage, this stage populates some mock data in third column.
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