[GitHub] [superset] betodealmeida commented on issue #17927: [SIP-77] Traversing Hierarchical Data ("Drill Down")

[GitBox <gi...@apache.org>]

betodealmeida commented on issue #17927:
URL: https://github.com/apache/superset/issues/17927#issuecomment-1007600171


   > @betodealmeida , has any consideration been given to adding hierarchical dimension semantics to the new dataset models?
   
   @villebro We have not, but we definitely should. It could be as simple as defining the parent column in the dataset, eg, in `city` we'd set `state` as the parent dimension, in `state` we'd set `country`, and so on.
   
   @EvilDrW I have questions about additive metrics. When you're at the country level, how do you compute the metrics, do you run a query with only `country` in the group by or do you run the full group by (`country`, `state`, `city`) and add the values? If the latter we should think how we're going to handle non-additive metrics like `COUNT DISTINCT` — this is another area where the semantic layer can help.


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