Workaround to run LineCombiner in Group mode? (OR condition)

Would 3 LineCombiners in a row give the expected results, one for each attribute?

It would absolutely do the job. Only thing is that I would need +10 of them. Was hoping for some clever trick to cut the number of transformers.

Can you elaborate a bit more on your data structure? Are columns A, B and C always present and do they always have a value? Can they have the same value?

The columns are always present, they do not always have a value but they can have the same value.

The LineCombiner in question is embeded in a custom transformer that is used in multiple streams. My plan B is to filter out only the columns that are needed for each respective stream. Before I venture into that I wanted see if there was some less convoluted way to mangage the group processing.

@aron​ Can you create a new group attribute using a conditional new_attr A if A NOT <null> or B if B NOT <null> OR C if C NOT <null and then use that?