: I would like to search for all documents with a field not defined. : Say You have documents with title_s defined and some documents without : title_s: I would like to obtain all documents without title_s. : : I've not find a clue, perhaps it's not possible; I would like to know if : there is an alternative to setting a default value "undefined" for title_s : on all documents.
This is a fairly common problem with lucene -- selecting the inverse of a query is hard, because you have to positively select something beore you can exclude things. There are some tricks for doing this in Solr if you are writing your own plugin using DocSets and BitSets, but if you're just using the StandardRequestHandler then one thing you can do if you've got a field that always contains at least one indexed value for every doc in your index (like a uniqueKey field for example) is to use an unbounded range query on your uniqueKey field to select every document, and then add a prohibited clause on an unbounded range query for the field you want to find missing values in, something like this... +uniqueKey:[* TO *] -title_s:[* TO *] ...normally in lucene really big range queries are dangerous, but Solr turns them into ConstantScoreRangeQueries under the covers for you so there's no big penalty. -Hoss
