How can I make the attributes of the other input of a join appear in the output

Problem

I used a joiner and was desperately looking for the attributes of the right input to propagate them to the output in the mapping tab but they where not there.

Solution

The joiner requires two thnigs not obvious to me:
  1. The attributes used to match the inputs must sport matching names!
  2. Attributes of the right joiner side you want to use in the output must NOT sport a name equal to one of the left side attributes!

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