cpoerschke commented on PR #3648:
URL: https://github.com/apache/solr/pull/3648#issuecomment-3309557370

   > I imagine this approach is doing query work in parallel without any extra 
code?
   
   Yes, that's my understanding too.
   
   > I see no accommodations for faceting to ensure we don't wastefully compute 
the docSet.
   
   Yeah, my understanding is that with this sort of approach there is 
conceptually no (obvious) support for faceting. Today, Solr's client would make 
two queries and then outside-of-Solr do the RRF locally -- conceptually that is 
what the approach here does too. Because the query work is in parallel and the 
doc sets are (I think) not passed back to where the fusion happens, then 
truly-correct faceting would not implicitly be available. ...
   
   ... having said that, currently the sub-queries are there and there are only 
sub-queries, so I imagine a fusion-aware faceting component might do an OR of 
the sub-queries and then send that for faceting purposes only i.e. with 
`rows=0` to the shards.


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