Joel Bernstein created SOLR-8092:
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             Summary: The same faceting DocSet is generated in both the first 
and second phase of distributed search if there are facet refinements.
                 Key: SOLR-8092
                 URL: https://issues.apache.org/jira/browse/SOLR-8092
             Project: Solr
          Issue Type: Improvement
            Reporter: Joel Bernstein


Currently the facet DocSet generated during the first phase of the distributed 
search is not cached. This means that during the facet refinement phase the 
DocSet needs to be recreated. This involves re-issuing the entire query and 
re-building the DocSet. In some use cases that can be a high price to pay to 
calculate refinements.

This ticket aims to find a way to cache the DocSet generated from the first 
phase so it can be re-used in the second phase.

We may also want to add a way to turn off refinements as some use case might 
want to trade off performance for accuracy.




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