Andrea Gazzarini created SOLR-9095:
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Summary: ReRanker should gracefully handle sorts without score
Key: SOLR-9095
URL: https://issues.apache.org/jira/browse/SOLR-9095
Project: Solr
Issue Type: Bug
Components: search
Affects Versions: 4.10.4
Environment: Solr 4.10.4
CentOS 6.5 64 bit
Java 1.8.0_51
Reporter: Andrea Gazzarini
Priority: Minor
I have a Solr 4.10.4 instance with a RequestHandler that has a re-ranking query
configured like this:
{code:title=solrconfig.xml|borderStyle=solid}
<lst name="defaults">
<str name="defType">dismax</str>
...
<str name="rqq">{!boost b=someFunction() v=$q}</str>
<str name="rq">{!rerank reRankQuery=$rqq reRankDocs=60
reRankWeight=1.2}</str>
<str name="sort">score desc</str>
</lst>
{code}
Everything is working until the client sends a sort params that doesn't include
the score field. So if for example the request contains "sort=price asc" then a
NullPointerException is thrown:
{code}
09:46:08,548 ERROR [org.apache.solr.core.SolrCore]
java.lang.NullPointerException
[INFO] [talledLocalContainer] at
org.apache.lucene.search.TopFieldCollector$OneComparatorScoringMaxScoreCollector.collect(TopFieldCollector.java:291)
[INFO] [talledLocalContainer] at
org.apache.solr.search.ReRankQParserPlugin$ReRankCollector.collect(ReRankQParserPlugin.java:263)
[INFO] [talledLocalContainer] at
org.apache.solr.search.SolrIndexSearcher.sortDocSet(SolrIndexSearcher.java:1999)
[INFO] [talledLocalContainer] at
org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1423)
[INFO] [talledLocalContainer] at
org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:514)
[INFO] [talledLocalContainer] at
org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:484)
[INFO] [talledLocalContainer] at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:218)
[INFO] [talledLocalContainer] at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
{code}
The only way to avoid this exception is to explicitly add the "score desc"
value to the incoming field; that is
{code}
?q=...&sort=price asc, score desc
{code}
In this way I get no exception. I said "explicitly" because adding an "appends"
section in my handler
{code}
<lst name="appends">
<str name="sort">score desc</str>
</lst>
{code}
Even I don't know if that could solve my problem, in practice it is completely
ignoring (i.e. I'm still getting the NPE above).
However, when I explicitly add "sort=price asc, score desc", as consequence of
the re-ranking, the top 60 results, although I said to Solr "order by price",
are still shuffled and that's not what I want.
So, at the end, the issue is about the following two points:
1. the NullPointerException above
2. a way to disable the re-ranking (automatically or not)
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