David Smiley created SOLR-14164:
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             Summary: Replace Solr's FunctionRangeQuery with Lucene's
                 Key: SOLR-14164
                 URL: https://issues.apache.org/jira/browse/SOLR-14164
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: David Smiley
            Assignee: David Smiley


Solr has a FunctionRangeQuery. It is constant scoring and also a post-filter.  
Lucene has a FunctionRangeQuery that I added years ago LUCENE-6919.  It is not 
constant scoring as it scores based on the wrapped ValueSource, although this 
is easily made the same as Solr's by wrapping in a ConstantScoreQuery.  And it 
uses Lucene's TwoPhaseIterator indirectly which is equivalent functionality to 
Solr's PostFilter.  Consequently we can remove Solr's implementation.  
Additionally, ValueSourceRangeFilter is a piece of the puzzle that can be 
removed as Solr's FunctionQuery was a wrapper around this specifically.  FYI 
Once upon a time, Query and Filter were separate, then Filter was made to 
subclass Query and then Filter was relegated to Solr as tech debt.



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