I need to dissolve a polygon layer by group but, at the same time, I need to keep some of the data in extra columns. This is the diagram:

enter image description here

This is the logic for the new group:

  • Cod = "Cod" where N1 is the highest
  • N1 = highest "N1" of group A
  • N2 = highest "N2" of group A
  • N3 = get value of N1 where "Cod" is the longest in length characters
  • N4 = get value of N1 where "Cod" is different from 0 AND 1 AND 1_2

The issue here is that I need to incorporate this into the modeler. Do I have any possibility. By the way, I could use either QGIS 2.XX or 3.XX

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