You can do that by writing a Filter which returns matching documents based on a sum of the field's value. However I suspect that is going to be slow, unless you know that you will need several such filters and can cache them.
Another approach would be to write a Collector which serves as a Filter, but computes the sum only for documents that match the query. Hopefully that would mean you compute the sum for less documents than you would have w/ the Filter approach. Shai On Wed, Apr 23, 2014 at 5:11 PM, Michael Sokolov < msoko...@safaribooksonline.com> wrote: > This isn't really a good use case for an index like Lucene. The most > essential property of an index is that it lets you look up documents very > quickly based on *precomputed* values. > > -Mike > > > On 04/23/2014 06:56 AM, Rob Audenaerde wrote: > >> Hi all, >> >> I'm looking for a way to use multi-values in a filter. >> >> I want to be able to search on sum(field)=100, where field has values in >> one documents: >> >> field=60 >> field=40 >> >> In this case 'field' is a LongField. I examined the code in the >> FieldCache, >> but that seems to focus on single-valued fields only, or >> >> >> It this something that can be done in Lucene? And what would be a good >> approach? >> >> Thanks in advance, >> >> -Rob >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > >
