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https://issues.apache.org/jira/browse/SOLR-69?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465114
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Bertrand Delacretaz commented on SOLR-69:
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The method used to compute includeScore in MoreLikeThisHelper was inconsistent
with what the XmlWriter does.
I have changed it to take this info from SolrQueryResponse.getReturnFields().
The md5 sum of the current SOLR-69 patch is b6178d11d33f19b296b741a67df00d45
With this change, all the following requests should work (standard and dismax
handlers, with no fl param, id only and id + score as return fields):
http://localhost:8983/solr/select/?stylesheet=&q=apache&qt=standard&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1
http://localhost:8983/solr/select/?stylesheet=&q=apache&qt=standard&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1&fl=id
http://localhost:8983/solr/select/?stylesheet=&q=apache&qt=standard&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1&fl=id,score
http://localhost:8983/solr/select/?stylesheet=&q=apache&qt=dismax&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1
http://localhost:8983/solr/select/?stylesheet=&q=apache&qt=dismax&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1&fl=id
http://localhost:8983/solr/select/?stylesheet=&q=apache&qt=dismax&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1&fl=id,score
> PATCH:MoreLikeThis support
> --------------------------
>
> Key: SOLR-69
> URL: https://issues.apache.org/jira/browse/SOLR-69
> Project: Solr
> Issue Type: Improvement
> Components: search
> Reporter: Bertrand Delacretaz
> Priority: Minor
> Attachments: lucene-queries-2.0.0.jar, SOLR-69.patch, SOLR-69.patch,
> SOLR-69.patch
>
>
> Here's a patch that implements simple support of Lucene's MoreLikeThis class.
> The MoreLikeThisHelper code is heavily based on (hmm..."lifted from" might be
> more appropriate ;-) Erik Hatcher's example mentioned in
> http://www.mail-archive.com/solr-user@lucene.apache.org/msg00878.html
> To use it, add at least the following parameters to a standard or dismax
> query:
> mlt=true
> mlt.fl=list,of,fields,which,define,similarity
> See the MoreLikeThisHelper source code for more parameters.
> Here are two URLs that work with the example config, after loading all
> documents found in exampledocs in the index (just to show that it seems to
> work - of course you need a larger corpus to make it interesting):
> http://localhost:8983/solr/select/?stylesheet=&q=apache&qt=standard&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mindf=1&fl=id,score
> http://localhost:8983/solr/select/?stylesheet=&q=apache&qt=dismax&mlt=true&mlt.fl=manu,cat&mlt.mindf=1&mlt.mindf=1&fl=id,score
> Results are added to the output like this:
> <response>
> ...
> <lst name="moreLikeThis">
> <result name="UTF8TEST" numFound="1" start="0" maxScore="1.5293242">
> <doc>
> <float name="score">1.5293242</float>
> <str name="id">SOLR1000</str>
> </doc>
> </result>
> <result name="SOLR1000" numFound="1" start="0" maxScore="1.5293242">
> <doc>
> <float name="score">1.5293242</float>
> <str name="id">UTF8TEST</str>
> </doc>
> </result>
> </lst>
> I haven't tested this extensively yet, will do in the next few days. But
> comments are welcome of course.
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