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https://issues.apache.org/jira/browse/SOLR-11809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16311735#comment-16311735
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David Smiley commented on SOLR-11809:
-------------------------------------
I suspect that the right solution is for "rq" to be parsed without care for
whatever defType is. The rationale is that defType is almost exclusively for
the "q" parameter; other parameters use the default of "lucene". Also note
that RQ must produce a query of a certain type, which is more evidence that
defType is irrelevant. I can appreciate that "hl.q" param is an exception
since when used it's a tweak of "q" in some way.
> QueryComponent.prepare rq parameter parsing fails under SOLR 7.2
> ----------------------------------------------------------------
>
> Key: SOLR-11809
> URL: https://issues.apache.org/jira/browse/SOLR-11809
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.2
> Environment: Windows 10, java version "1.8.0_151"
> Reporter: Dariusz Wojtas
> Attachments: SOLR-11809.patch, ltr-sample.zip
>
>
> The LTR functionality that works under SOLR 7.0 and 7.1 stopped working in
> 7.2.
> From the solr-user mailing list it appears it might be related to SOLR-11501 .
> I am attaching the minimal working collection definition (attached
> [^ltr-sample.zip]) that shows the problem.
> Please deploy the collection (unpack under "server/solr"), run solr and
> invoke the URL below.
> http://localhost:8983/solr/ltr-sample/select?q=*:*
> Behaviour:
> * under 7.0 and 7.1 - empty resultset is returned (there is no data in the
> collection)
> * under 7.2 - error: "rq parameter must be a RankQuery". The stacktrace
> {code}
> 2018-01-02 20:51:06.807 INFO (qtp205125520-20) [ x:ltr-sample]
> o.a.s.c.S.Request [ltr-sample] webapp=/solr path=/select
> params={q=*:*&_=1514909140928} status=400 QTime=23
> 2018-01-02 21:04:27.293 ERROR (qtp205125520-17) [ x:ltr-sample]
> o.a.s.h.RequestHandlerBase org.apache.solr.common.SolrException: rq parameter
> must be a RankQuery
> at
> org.apache.solr.handler.component.QueryComponent.prepare(QueryComponent.java:183)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:269)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:177)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2503)
> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:710)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:516)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:382)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:326)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1751)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
> [..]
> {code}
> i have checked - the same issue exists when I try to invoke the _rerank_
> query parser.
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