codice/ddf-catalog — pull request #38 by McLucas (2014-11-20 23:30:54+00:00)
Title: DDF-894 Added propertyIsNull support to the SolrFilterDelegate

-kind of odd to get this to work. First you come in without a field type so we have to do so using the getAnonymousField() method. Than we have to use the negative queries to actually get the results we need. (*:* -fieldName:[* TO *]) is the magic sause to get this to work. For details on how this works, visit the url below.
-http://stackoverflow.com/questions/17044661/how-to-filter-search-by-values-that-are-not-available/17045097#17045097