I'm glad to hear it helped you, Ramprakash. Don't hesitate to post questions to the list if you need further assistance!
Shai On Fri, Feb 1, 2013 at 9:12 AM, Ramprakash Ramamoorthy < youngestachie...@gmail.com> wrote: > On Fri, Jan 25, 2013 at 6:23 PM, Shai Erera <ser...@gmail.com> wrote: > > > Hi > > > > Are the values of 'a' and 'b' known in advance? Is it a limited set of > > values? Are you always interested in a table which covers all values? > > > > If so, one way to do that is to each value of 'a' against all values of > > 'b'. Of course, pick as pivot the dimension with the least values. Note > > however that if the number of values of 'a' and 'b' are big, it may be > > costly to run N searches (even if you optimize the query processing). > > > > If the cardinality of 'a' and 'b' is small, and if you index for each > > document only one value of 'a' and one value of 'b' (maybe some documents > > only have 'a' or 'b'...), then there is another way. > > You can run the query 'a AND b', where 'a' and 'b' are the facet > dimensions > > and for every matching document count a "fake" facet which is a pair of > > ordinals, e.g. [1,45], [1,23] ... > > In the end, you'll have the counts of the pair of ordinals and you can > use > > TaxonomyReader to label the ordinals of each pair and return the table. > > That will work as long as the cardinality of 'a' and 'b' is sane :-) > > > > Shai > > > > Thank you Shai, I was able to achieve it roundabout. I read this blog< > http://shaierera.blogspot.com/2012/12/lucene-facets-under-hood.html>of > yours and came to know about the setDepth method in FacetRequest. Was > able to solve my use case with it. Thank you for the blog and the answer! > > > > > On Fri, Jan 25, 2013 at 12:12 PM, Ramprakash Ramamoorthy < > > youngestachie...@gmail.com> wrote: > > > > > Hello, > > > > > > After reading the facet help document of Lucene 4, I can see it > > > helps for a folder structure like faceting. I would like to have a > > > multi-level/multiple faceting in my application. > > > > > > Let me explain, we have a requirement of something like a > > > contingency table > > > (wikipedia<http://en.wikipedia.org/wiki/Contingency_table> link). > > > Say we are having two fields a and b, I need to know the facet counts > of > > b, > > > for each distinct value in a. Also apart from contingency matrix, this > > > could expand to more than 2 fields as well. > > > > > > Is there a way/work around lucene can help me with such multi > > level > > > faceting. Please advice. Thanks in advance. > > > > > > -- > > > With Thanks and Regards, > > > Ramprakash Ramamoorthy, > > > India. > > > > > > > > > -- > With Thanks and Regards, > Ramprakash Ramamoorthy, > India, > +91 9626975420 >
