Regarding my original goal, which is to perform a math function using the
scaled score and a field value, and sort on the result, how does this fit
in? Must I implement another custom PostFilter with a higher cost than the
scale PostFilter?
Thanks,
Peter
On Wed, Dec 11, 2013 at 4:01 PM, Peter Keegan <peterlkee...@gmail.com>wrote:
> Thanks very much for the guidance. I'd be happy to donate a working
> solution.
>
> Peter
>
>
> On Wed, Dec 11, 2013 at 3:53 PM, Joel Bernstein <joels...@gmail.com>wrote:
>
>> SOLR-5020 has the commit info, it's mainly changes to SolrIndexSearcher I
>> believe. They might apply to 4.3.
>> I think as long you have the finish method that's all you'll need. If you
>> can get this working it would be excellent if you could donate back the
>> Scale PostFilter.
>>
>>
>> On Wed, Dec 11, 2013 at 3:36 PM, Peter Keegan <peterlkee...@gmail.com
>> >wrote:
>>
>> > This is what I was looking for, but the DelegatingCollector 'finish'
>> method
>> > doesn't exist in 4.3.0 :( Can this be patched in and are there any
>> other
>> > PostFilter dependencies on 4.5?
>> >
>> > Thanks,
>> > Peter
>> >
>> >
>> > On Wed, Dec 11, 2013 at 3:16 PM, Joel Bernstein <joels...@gmail.com>
>> > wrote:
>> >
>> > > Here is one approach to use in a postfilter
>> > >
>> > > 1) In the collect() method call score for each doc. Use the scores to
>> > > create your scaleInfo.
>> > > 2) Keep a bitset of the hits and a priorityQueue of your top X
>> ScoreDocs.
>> > > 3) Don't delegate any documents to lower collectors in the collect()
>> > > method.
>> > > 4) In the finish method create a score mapping (use the hppc
>> > > IntFloatOpenHashMap) with your top X docIds pointing to their score,
>> > using
>> > > the priorityQueue created in step 2. Then iterate the bitset (also
>> > created
>> > > in step 2) sending down each doc to the lower collectors, retrieving
>> and
>> > > scaling the score from the score map. If the document is not in the
>> score
>> > > map then send down 0.
>> > >
>> > > You'll have setup a dummy scorer to feed to lower collectors. The
>> > > CollapsingQParserPlugin has an example of how to do this.
>> > >
>> > >
>> > >
>> > >
>> > > On Wed, Dec 11, 2013 at 2:05 PM, Peter Keegan <peterlkee...@gmail.com
>> > > >wrote:
>> > >
>> > > > Hi Joel,
>> > > >
>> > > > I thought about using a PostFilter, but the problem is that the
>> 'scale'
>> > > > function must be done after all matching docs have been scored but
>> > before
>> > > > adding them to the PriorityQueue that sorts just the rows to be
>> > returned.
>> > > > Doing the 'scale' function wrapped in a 'query' is proving to be too
>> > slow
>> > > > when it visits every document in the index.
>> > > >
>> > > > In the Collector, I can see how to get the field values like this:
>> > > >
>> > > >
>> > >
>> >
>> indexSearcher.getSchema().getField("field(myfield").getType().getValueSource(SchemaField,
>> > > > QParser).getValues()
>> > > >
>> > > > But, 'getValueSource' needs a QParser, which isn't available.
>> > > > And I can't create a QParser without a SolrQueryRequest, which isn't
>> > > > available.
>> > > >
>> > > > Thanks,
>> > > > Peter
>> > > >
>> > > >
>> > > > On Wed, Dec 11, 2013 at 1:48 PM, Joel Bernstein <joels...@gmail.com
>> >
>> > > > wrote:
>> > > >
>> > > > > Peter,
>> > > > >
>> > > > > It sounds like you could achieve what you want to do in a
>> PostFilter
>> > > > rather
>> > > > > then extending the TopDocsCollector. Is there a reason why a
>> > PostFilter
>> > > > > won't work for you?
>> > > > >
>> > > > > Joel
>> > > > >
>> > > > >
>> > > > > On Tue, Dec 10, 2013 at 3:24 PM, Peter Keegan <
>> > peterlkee...@gmail.com
>> > > > > >wrote:
>> > > > >
>> > > > > > Quick question:
>> > > > > > In the context of a custom collector, how does one get the
>> values
>> > of
>> > > a
>> > > > > > field of type 'ExternalFileField'?
>> > > > > >
>> > > > > > Thanks,
>> > > > > > Peter
>> > > > > >
>> > > > > >
>> > > > > > On Tue, Dec 10, 2013 at 1:18 PM, Peter Keegan <
>> > > peterlkee...@gmail.com
>> > > > > > >wrote:
>> > > > > >
>> > > > > > > Hi Joel,
>> > > > > > >
>> > > > > > > This is related to another thread on function query matching (
>> > > > > > >
>> > > > > >
>> > > > >
>> > > >
>> > >
>> >
>> http://lucene.472066.n3.nabble.com/Function-query-matching-td4099807.html#a4105513
>> > > > > > ).
>> > > > > > > The patch in SOLR-4465 will allow me to extend
>> TopDocsCollector
>> > and
>> > > > > > perform
>> > > > > > > the 'scale' function on only the documents matching the main
>> > dismax
>> > > > > > query.
>> > > > > > > As you mention, it is a slightly intrusive design and requires
>> > > that I
>> > > > > > > manage my own PriorityQueue (and a local duplicate of
>> HitQueue),
>> > > but
>> > > > > > should
>> > > > > > > work. I think a better design would hide the PQ from the
>> plugin.
>> > > > > > >
>> > > > > > > Thanks,
>> > > > > > > Peter
>> > > > > > >
>> > > > > > >
>> > > > > > > On Sun, Dec 8, 2013 at 5:32 PM, Joel Bernstein <
>> > joels...@gmail.com
>> > > >
>> > > > > > wrote:
>> > > > > > >
>> > > > > > >> Hi Peter,
>> > > > > > >>
>> > > > > > >> I've been meaning to revisit configurable ranking collectors,
>> > but
>> > > I
>> > > > > > >> haven't
>> > > > > > >> yet had a chance. It's on the shortlist of things I'd like to
>> > > tackle
>> > > > > > >> though.
>> > > > > > >>
>> > > > > > >>
>> > > > > > >>
>> > > > > > >> On Fri, Dec 6, 2013 at 4:17 PM, Peter Keegan <
>> > > > peterlkee...@gmail.com>
>> > > > > > >> wrote:
>> > > > > > >>
>> > > > > > >> > I looked at SOLR-4465 and SOLR-5045, where it appears that
>> > there
>> > > > is
>> > > > > a
>> > > > > > >> goal
>> > > > > > >> > to be able to do custom sorting and ranking in a
>> PostFilter.
>> > So
>> > > > far,
>> > > > > > it
>> > > > > > >> > looks like only custom aggregation can be implemented in
>> > > > PostFilter
>> > > > > > >> (5045).
>> > > > > > >> > Custom sorting/ranking can be done in a pluggable collector
>> > > > (4465),
>> > > > > > but
>> > > > > > >> > this patch is no longer in dev.
>> > > > > > >> >
>> > > > > > >> > Is there any other dev. being done on adding custom sorting
>> > > (after
>> > > > > > >> > collection) via a plugin?
>> > > > > > >> >
>> > > > > > >> > Thanks,
>> > > > > > >> > Peter
>> > > > > > >> >
>> > > > > > >>
>> > > > > > >>
>> > > > > > >>
>> > > > > > >> --
>> > > > > > >> Joel Bernstein
>> > > > > > >> Search Engineer at Heliosearch
>> > > > > > >>
>> > > > > > >
>> > > > > > >
>> > > > > >
>> > > > >
>> > > > >
>> > > > >
>> > > > > --
>> > > > > Joel Bernstein
>> > > > > Search Engineer at Heliosearch
>> > > > >
>> > > >
>> > >
>> > >
>> > >
>> > > --
>> > > Joel Bernstein
>> > > Search Engineer at Heliosearch
>> > >
>> >
>>
>>
>>
>> --
>> Joel Bernstein
>> Search Engineer at Heliosearch
>>
>
>
