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How to specify the output aggregate flag field in the Group By step

Question asked by John Sterritt on Nov 29, 2018

I'm trying to improve the performance of my "Group By" step and would like to use the cumulative sum and average aggregates. I'm hoping the cumulative sum and averaging will be quicker. In order to use these aggregates I have to enable the "Include All Rows?" option.


The help documentation states

"Enable if you want all rows in the output, not just the aggregation; to differentiate between the two types of rows in the output, a flag is required in the output. You must specify the name of the flag field in that case (the type is boolean)."


I would like to know where the boolean flag field is to be specified. I cannot see any settings on the UI that will allow me to specify a boolean aggregate field flag.