I'm trying to figure out why adding an "OR" condition to a query filter would 
end up restricting results, instead of unioning them? I would expect to get 
back more results by adding a union to the filter query.


Case 1 – 380 Results

380 results are returned with a query of xyz with a query filter of

(NOT sentence_id:[* TO *])


Case 2 – 41 Results

41 results are returned with the same query and a filter query of

(usage_flags:PRESCRIPTION)


Case 3 – Union of Case 1 and 2

Only 41 results are returned using the same query and a filter query of

(NOT sentence_id:[* TO *])

OR

(usage_flags:PRESCRIPTION)



I would expect that I would get at least 380 results with the union, instead of 
the 41 that I am seeing.

I only really notice this issue when using the NOT operator, so perhaps the 
problem lies with not understanding quite how the NOT operator is applied here. 
Any ideas?


I'm testing using the Solr /admin/form.jsp

Solr Implementation Version: 3.6.0 1310449 - rmuir - 2012-04-06 11:34:53

The default query parser is EDisMax, though I don't think that will change the 
filter queries.

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