sramazzina opened a new issue, #2211:
URL: https://github.com/apache/hop/issues/2211

   ### Apache Hop version?
   
   2.3.0
   
   ### Java version?
   
   OpenJDK 11
   
   ### Operating system
   
   Linux
   
   ### What happened?
   
   If you have a GroupBy transform and you are asking to give back the number 
of incoming rows, the _Always give back a result row_ flag is always set (even 
if you try to save it as unset) so that it always tries to give back a result 
row even if that is not requested. This bug gives a performance issue on 
complex pipelines because, even if not wanted, the transform is trying to 
generate as output an empty row and takes a lot of time to generate it because 
it takes a lot of time discovering the layout of the generated output flow. We 
tested that this feature was perfectly working up until Hop 1.2.0.
   
   ### Issue Priority
   
   Priority: 2
   
   ### Issue Component
   
   Component: Transforms


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