Provided by: libplucene-perl_1.25-4_all bug


       Plucene::Search::Filter - A search filter base class


       This doesn't seem to be being used just yet. But here is some info on filters:

       Filtering means imposing additional restriction on the hit list to eliminate hits that
       otherwise would be included in the search results.

       There are two ways to filter hits:

       ·   Search Query - in this approach, provide your custom filter object to the when you
           call the search() method. This filter will be called exactly once to evaluate every
           document that resulted in non zero score.

       ·   Selective Collection - in this approach you perform the regular search and when you
           get back the hit list, collect only those that matches your filtering criteria. In
           this approach, your filter is called only for hits that returned by the search method
           which may be only a subset of the non zero matches (useful when evaluating your search
           filter is expensive).


       This must be defined in a subclass