Sorting facets by relevance
Hi, we are using faceted search for our queries. However neither sorting by count nor sorting by index as described in [1] is suitable for our business case. Instead, we would like to have the facets (or at least the beginning of them) sorted by the score of the top document possessing the corresponding facet. The expected behaviour can be compared to what the result grouping feature does (see [2]). I am currently thinking about the following strategy: (1) Create a new search component (2) Perform a sub-query using grouping (3) Use the result of this sub-query in order to sort the facets of the actual query. Currently step no. 2 seems to be pretty difficult. Can anybody point a me to an example, where a sub-query is performed in order to retrieve the groups? Or does anybody have a better/easier strategy for achieving this? Any help is appreciated. Thank you very much in advance. Best regards Jan [1]: http://wiki.apache.org/solr/SimpleFacetParameters#facet.sort [2]: http://wiki.apache.org/solr/FieldCollapsing -- View this message in context: http://lucene.472066.n3.nabble.com/Sorting-facets-by-relevance-tp4063649.html Sent from the Solr - User mailing list archive at Nabble.com.
Re: Sorting facets by relevance
There is Lucene faceting module, which doesn't do anything in common with Solr, but it looks like it has something what you are looking for. http://shaierera.blogspot.com/2012/11/lucene-facets-part-1.html On Thu, May 16, 2013 at 1:33 AM, Jan Morlock jan.morl...@googlemail.comwrote: Hi, we are using faceted search for our queries. However neither sorting by count nor sorting by index as described in [1] is suitable for our business case. Instead, we would like to have the facets (or at least the beginning of them) sorted by the score of the top document possessing the corresponding facet. The expected behaviour can be compared to what the result grouping feature does (see [2]). I am currently thinking about the following strategy: (1) Create a new search component (2) Perform a sub-query using grouping (3) Use the result of this sub-query in order to sort the facets of the actual query. Currently step no. 2 seems to be pretty difficult. Can anybody point a me to an example, where a sub-query is performed in order to retrieve the groups? Or does anybody have a better/easier strategy for achieving this? Any help is appreciated. Thank you very much in advance. Best regards Jan [1]: http://wiki.apache.org/solr/SimpleFacetParameters#facet.sort [2]: http://wiki.apache.org/solr/FieldCollapsing -- View this message in context: http://lucene.472066.n3.nabble.com/Sorting-facets-by-relevance-tp4063649.html Sent from the Solr - User mailing list archive at Nabble.com. -- Sincerely yours Mikhail Khludnev Principal Engineer, Grid Dynamics http://www.griddynamics.com mkhlud...@griddynamics.com
Sorting Facets by First Occurrence
I'm working on replacing a custom, internal search implementation with Solr. I'm having great success, with one small exception. When implementing our version of faceting, one of our facets had a peculiar sort order. It was dictated by the order in which the field occurred in the results. The first time a value occurred it was added to the list and regardless of the number of times it occurred, it always stayed at the top. For example, if a search yielded 10 results, 1 - 10, and hit 1 is in category 'Toys', hit 2 through 9 are in 'Sports' and the last is in 'Household' then the facet would look like: facet.fields - category - [ Toys: 1, Sports: 8 Household: 1 ] The facet.sort only gives me the option to sort highest count first or alphabetically. So, the question I _really_ have is: how can I implement this feature? I could examine the results i'm returned and create my own facet order from it, but I thought this might be useful for others. I don't know my way around Solr's source, so I though dropping a note to the list would be faster than code spelunking with no light. -- Cory 'G' Watson http://www.onemogin.com
Re: Sorting Facets by First Occurrence
: I'm working on replacing a custom, internal search implementation with : Solr. I'm having great success, with one small exception. ... : For example, if a search yielded 10 results, 1 - 10, and hit 1 is in : category 'Toys', hit 2 through 9 are in 'Sports' and the last is in : 'Household' then the facet would look like: ...and what if you had 100,000 results? did it really look at every doc that matched a query to decide the facet ordering, or did it stop at 10? : So, the question I _really_ have is: how can I implement this feature? It depends ... how was the previous version implemented? (you mentioned it was a custom internal solution, so i assume you have access to the code and can explain it to us in psuedo code ... that would give people the best insight into what exactly it was doing to make a Solr based comparison) : I could examine the results i'm returned and create my own facet : order from it, but I thought this might be useful for others. I don't : know my way around Solr's source, so I though dropping a note to the : list would be faster than code spelunking with no light. All of Solr's existing faceting code is based on the DocSet which is an unordered set of all matching documents -- i suspect your existing application only reordered the facets based on their appearance in the first N docs (possibly just the first page, but maybe more) so doing something like that using the DocList would certainly be feasible. if your number of facet constraints is low enough that they are all returned everytime then doing it in the client is probably the easiest -- but if you have to worry about facet.limit preventing something from being returned that might otherwise bubble to the top of your list when you reorder it then you'll need to customise the FacetComponent. -Hoss
Re: Sorting Facets by First Occurrence
On Nov 30, 2009, at 5:15 PM, Chris Hostetter wrote: All of Solr's existing faceting code is based on the DocSet which is an unordered set of all matching documents -- i suspect your existing application only reordered the facets based on their appearance in the first N docs (possibly just the first page, but maybe more) so doing something like that using the DocList would certainly be feasible. if your number of facet constraints is low enough that they are all returned everytime then doing it in the client is probably the easiest -- but if you have to worry about facet.limit preventing something from being returned that might otherwise bubble to the top of your list when you reorder it then you'll need to customise the FacetComponent. You are right, I left out a few important bits there. Tried to be brief and succeeding in being vague? :) Effectively I was ordering the facet based on the N documents in the current page. My thought that his was a good feature for a facet now seems incorrect, as my needs are limited to the current page, not the whole set of results. I'll probably elect to fetching data from the facets based on the page of documents I'm showing. Thanks for the discussion, it helped! :) Cory G Watson http://www.onemogin.com
Sorting facets
My apologies if this has been answered before but I couldn't see it in the FAQ, tutorial or wiki or the solr-user mail archives. The explanation for sorting the documents returned by a search is quite straight foward. I'm currently seeing the facets arriving in a more random order. Is the expectation that the code processing the result will apply its own sorts to the facet lists? or is there some other option I'm overlooking? Walter Lewis
