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https://issues.apache.org/jira/browse/SOLR-69?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493185
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Brian Whitman commented on SOLR-69:
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I've personally never understood the "more documents that don't match this
query but are like the documents in this query" usage of SOLR-69. MLT results
(to me) should be like any other result, except by querying by text you are
querying by document ID. I'm confused as to how querying by query would work
-- if a query for 'apache' returned 10 docs, would MLT work on each one and
generate n more docs per doc? And would the original query results get
returned? What's the ordering?
But I do know that paging and faceting should definitely work on MLT results.
(Ryan's patch seems to implement this but I haven't tested it.) MLT results
should look and operate like any other results.
> 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, lucene-queries-2.1.1-dev.jar,
> SOLR-69-MoreLikeThisRequestHandler.patch, SOLR-69.patch, 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/[EMAIL PROTECTED]/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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