Does Solr's “More like this” support facet queries?

问题

I have been able to facet and highlight with the Dismax handler.

I tried to do faceting for More Like This results, such as this query: "fetch documents similar to '11qualcomm.doc' whose 'doc_keywords' has 'Communication' as mandatory.

select?
facet=on&facet.field=doc_keywords&facet.mincount=1
&fl=id,score
&fq=doc_keywords:%22Communication%22
&indent=true
&mlt=true&mlt.count=20
&mlt.fl=doc_keywords_searchable,doc_author_searchable,doc_abstract,text&mlt.mindf=1&mlt.mintf=1
&mlt.qf=doc_keywords_searchable%5E15+doc_author_searchable%5E15+doc_abstract%5E10+text
&q=id:%2211qualcomm.doc%22
&rows=1&wt=python

But the results are:

'facet_counts':{
    'facet_queries':{},
    'facet_fields':{
      'doc_keywords':[
        'Communication',1,
        'Corporation',1]},
    'facet_dates':{},
    'facet_ranges':{}}

Which implies that the faceting only worked for q=id:"11qualcomm.doc" and not for the MLT result set.

Does faceting work for the MLT result set? If yes, what am I doing wrong?

回答1:

Found the answer myself. I am supposed to use the More Like This handler, instead of using the MLT of the search handler. The MLT handler "supports faceting, paging, and filtering using CommonQueryParameters" (from wiki).

The two ways to enable MLT functionality http://wiki.apache.org/solr/MoreLikeThis
More Like This handler http://wiki.apache.org/solr/MoreLikeThisHandler#Examples

回答2:

Filter queries were recently added as an support for the Solr More Like this feature.
https://issues.apache.org/jira/browse/SOLR-2351

The fix version marked however is 3.5 and 4.0, so it may not work for you.
Can check for the patch or upgrade.

来源：https://stackoverflow.com/questions/7832145/does-solrs-more-like-this-support-facet-queries

标签

solr

faceted-search

morelikethis