mattcasters commented on issue #5167:
URL: https://github.com/apache/hop/issues/5167#issuecomment-6556567257

   The Group Key tab has a Get Fields button. It adds incoming fields that are 
not already listed on the Fields tab or the Group Key tab, and it leaves 
existing key rows and their element names in place.
   
   See `JsonEOutputDialog.getKeyFieldsFromPrevious` and `suggestKeyFieldNames`. 
The Group Key section of `enhancedjsonoutput.adoc` describes the button.
   
   Landed in #8715.


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