julianhyde opened a new pull request #2212:
URL: https://github.com/apache/calcite/pull/2212


   Improve how class Sarg handles IS NULL and IS NOT NULL
   conditions. They are now handled symmetrically, using fields
   nullCount and notNullCount, whereas previously we used
   containsNull, which could handle IS NULL only in certain
   circumstances and IS NOT NULL not at all.


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