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lookup - append only columns with values



I've got a lookup with a number of records, and not all of them have all columns populated. Is there a way to append only those columns which are not empty?

Something similar to:


| lookup mylookup lookup_key OUTPUTNEW list of columns to append
| <some SPL here to hide columns which are empty>


I'd be grateful for any tips.  I was experimenting with foreach but with no results.


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