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https://issues.apache.org/jira/browse/SOLR-7883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15353755#comment-15353755
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Erik Hatcher commented on SOLR-7883:
------------------------------------
Facets are driven off the result set (generated from the MLT query). Maybe
you're just not seeing the effect of it? Here's an example:
Solr 5.4.1 (because that's the latest one I had laying around)
{code}
$ bin/solr start -e techproducts
$ curl
'http://localhost:8983/solr/techproducts/select?wt=ruby&indent=on&debug=query&rows=0&facet=on&facet.field=cat&facet.mincount=1&q=%7B!mlt%20mindf=1%20mintf=1%7DGB18030TEST'
{
'responseHeader'=>{
'status'=>0,
'QTime'=>2,
'params'=>{
'q'=>'{!mlt mindf=1 mintf=1}GB18030TEST',
'facet.field'=>'cat',
'debug'=>'query',
'indent'=>'on',
'facet.mincount'=>'1',
'rows'=>'0',
'wt'=>'ruby',
'facet'=>'on'}},
'response'=>{'numFound'=>1,'start'=>0,'docs'=>[]
},
'facet_counts'=>{
'facet_queries'=>{},
'facet_fields'=>{
'cat'=>[
'search',1,
'software',1]},
'facet_dates'=>{},
'facet_ranges'=>{},
'facet_intervals'=>{},
'facet_heatmaps'=>{}},
'debug'=>{
'rawquerystring'=>'{!mlt mindf=1 mintf=1}GB18030TEST',
'querystring'=>'{!mlt mindf=1 mintf=1}GB18030TEST',
'parsedquery'=>'(+(features:here name:characters features:no features:个
features:份 features:shiny features:光 features:有 name:gb18030 features:very
features:功 features:很 features:件 features:feature features:能 features:一
id:GB18030TEST features:泽 features:文 features:document features:this
features:is features:是 features:这 features:translated)
-id:GB18030TEST)/no_coord',
'parsedquery_toString'=>'+(features:here name:characters features:no
features:个 features:份 features:shiny features:光 features:有 name:gb18030
features:very features:功 features:很 features:件 features:feature features:能
features:一 id:GB18030TEST features:泽 features:文 features:document features:this
features:is features:是 features:这 features:translated) -id:GB18030TEST',
'QParser'=>'SimpleMLTQParser'}}
$ curl
'http://localhost:8983/solr/techproducts/select?wt=ruby&indent=on&debug=query&rows=0&facet=on&facet.field=cat&facet.mincount=1&q=%7B!mlt%20mindf=1%20mintf=1%7DSP2514N'
{
'responseHeader'=>{
'status'=>0,
'QTime'=>4,
'params'=>{
'q'=>'{!mlt mindf=1 mintf=1}SP2514N',
'facet.field'=>'cat',
'debug'=>'query',
'indent'=>'on',
'facet.mincount'=>'1',
'rows'=>'0',
'wt'=>'ruby',
'facet'=>'on'}},
'response'=>{'numFound'=>12,'start'=>0,'docs'=>[]
},
'facet_counts'=>{
'facet_queries'=>{},
'facet_fields'=>{
'cat'=>[
'electronics',11,
'memory',3,
'connector',2,
'graphics card',2,
'camera',1,
'copier',1,
'hard drive',1,
'multifunction printer',1,
'music',1,
'printer',1,
'scanner',1]},
'facet_dates'=>{},
'facet_ranges'=>{},
'facet_intervals'=>{},
'facet_heatmaps'=>{}},
'debug'=>{
'rawquerystring'=>'{!mlt mindf=1 mintf=1}SP2514N',
'querystring'=>'{!mlt mindf=1 mintf=1}SP2514N',
'parsedquery'=>'(+(features:cache name:hard manu:co features:technology
features:ide id:SP2514N features:silentseek features:fdb features:noiseguard
manu:ltd features:motor name:p120 features:ultra features:dynamic
features:fluid name:spinpoint features:8mb features:bearing name:sp2514n
features:7200rpm name:250 cat:electronics features:133 id:samsung features:ata)
-id:SP2514N)/no_coord',
'parsedquery_toString'=>'+(features:cache name:hard manu:co
features:technology features:ide id:SP2514N features:silentseek features:fdb
features:noiseguard manu:ltd features:motor name:p120 features:ultra
features:dynamic features:fluid name:spinpoint features:8mb features:bearing
name:sp2514n features:7200rpm name:250 cat:electronics features:133 id:samsung
features:ata) -id:SP2514N',
'QParser'=>'SimpleMLTQParser'}}
{code}
> MoreLikeThis is incompatible with facets
> ----------------------------------------
>
> Key: SOLR-7883
> URL: https://issues.apache.org/jira/browse/SOLR-7883
> Project: Solr
> Issue Type: Bug
> Components: faceting, MoreLikeThis
> Affects Versions: 5.2.1
> Environment: Arch Linux / OpenJDK 7.u85_2.6.1-1
> Reporter: Thomas Seidl
> Assignee: Shalin Shekhar Mangar
>
> When using the {{MoreLikeThis}} request handler, it doesn't seem possible to
> also have facets. This worked in Solr 4, but seems to be broken now.
> Example:
> This works: {{?qt=mlt&q=id:item1&mlt.fl=content}}
> This doesn't: {{?qt=mlt&q=id:item1&mlt.fl=content&facet=true}}
> (Yes, you don't even need to specify any facet fields/ranges/queries. The
> {{q}} query just has to match an item.)
> While the latter will actually return the same result set as the former, the
> HTTP status is 500 and the following error included in the response:
> {noformat}
> java.lang.NullPointerException
> at
> org.apache.solr.request.SimpleFacets.getHeatmapCounts(SimpleFacets.java:1753)
> at
> org.apache.solr.request.SimpleFacets.getFacetCounts(SimpleFacets.java:289)
> at
> org.apache.solr.handler.MoreLikeThisHandler.handleRequestBody(MoreLikeThisHandler.java:233)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2064)
> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:654)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:450)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:196)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
> at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
> at
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
> at org.eclipse.jetty.server.Server.handle(Server.java:497)
> at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
> at
> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
> at
> org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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