I've put the question nicely formatted on StackOverflow here http://stackoverflow.com/questions/8360257/solr-lucene-why-is-this-or-query-failing-when-the-two-individual-queries-suc
Here is that question Verbatim: I have a Solr document schema with with a solr.TrieDateField and noticed this boolean query (not authored by me) which I thought could benefit from some simplification; q=-(-event_date:[2011-12-02T00:00:00.000Z TO NOW/DAY+90DAYS] OR (event_date:[* TO *])) which means *events within the next 90 days or non-events* (See Pure Negative<http://wiki.apache.org/solr/SolrQuerySyntax#Differences_From_Lucene_Query_Parser>for Solr boolean NOT notation) . My simplification looked like q=event_date:[2011-12-02T00:00:00.000Z TO NOW/DAY+90DAYS] OR -event_date:[* TO *] As stated, this didn't work (0 results). So as a test I ran the two sides of the OR query individually and the sum of the two results (both non-zero) equaled the sum of the original query and I can't come up with a good explanation why. Running with debugQuery=true didn't present anything helpful. Thanks, Mark
