Hi Shai, all, I am trying to write that Filter :). But I'm a bit at loss as how to efficiently grab the multi-values. I can access the context.reader().document() that accesses the storedfields, but that seems slow.
For single-value fields I use a compiled JavaScript Expression with simplebindings as ValueSource, which seems to work quite well. The downside is that I cannot find a way to implement multi-value through that solution. These create for example a LongFieldSource, which uses the FieldCache.LongParser. These parsers only seem te parse one field. Is there an efficient way to get -all- of the (numeric) values for a field in a document? On Wed, Apr 23, 2014 at 4:38 PM, Shai Erera <ser...@gmail.com> wrote: > 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 > > > > >
