jtibshirani opened a new pull request #1948:
URL: https://github.com/apache/lucene-solr/pull/1948


   For doc values that are not too high cardinality, it is common for some large
   segments to contain all distinct values. In this case, we can check if the 
first
   segment ords map perfectly to global ords, and if so store the global ord 
deltas
   and first segment indices as `LongValues.ZEROES`
   to save some space.


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