magibney opened a new pull request #588:
URL: https://github.com/apache/solr/pull/588


   See: [SOLR-14764](https://issues.apache.org/jira/browse/SOLR-14764)
   
   Particularly for high-recall, high-cardinality cases, `sort:"index desc"` 
currently performs far less well than `sort:"index asc"` (passing every term 
through a priority queue as if it were a FIFO queue, but with lots of 
unnecessary comparisons).
   
   This PR addresses that issue. Essentially: we can't really afford to 
ignore/abstract the fact that there is a direct connection between native ord 
sort order and order of iteration in building the priority queue for the 
`sort:"index [asc|desc]"` case.


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