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https://issues.apache.org/jira/browse/SOLR-69?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12470660
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Bertrand Delacretaz commented on SOLR-69:
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Making this a separate handler would probably make the code easier to
understand, but the current code makes case 2) easier, while making case 1)
easy as well (just query on the document's unique ID, with MoreLikeThis
enabled).
I'm for keeping it as is, integrated in the handlers as an option. If someone
needs it as a separate handler, it wouldn't be hard to factor our the common
parts.
I have no strong feelings, however, as I built this patch to experiment with
this feature but I'm not using it yet.
> 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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