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https://issues.apache.org/jira/browse/SOLR-13944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17057397#comment-17057397
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Tomas Eduardo Fernandez Lobbe commented on SOLR-13944:
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Quick question, and again, I'm not very familiar with this part of the code, do
we need to actually parse the filter? would it be enough to validate the parser
that's returned by {{QParse.getParser(...)}}?
> CollapsingQParserPlugin throws NPE instead of bad request
> ---------------------------------------------------------
>
> Key: SOLR-13944
> URL: https://issues.apache.org/jira/browse/SOLR-13944
> Project: Solr
> Issue Type: Bug
> Affects Versions: 7.3.1
> Reporter: Stefan
> Assignee: Munendra S N
> Priority: Minor
> Attachments: SOLR-13944.patch, SOLR-13944.patch
>
>
> I noticed the following NPE:
> {code:java}
> java.lang.NullPointerException at
> org.apache.solr.search.CollapsingQParserPlugin$OrdFieldValueCollector.finish(CollapsingQParserPlugin.java:1021)
> at
> org.apache.solr.search.CollapsingQParserPlugin$OrdFieldValueCollector.finish(CollapsingQParserPlugin.java:1081)
> at
> org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:230)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1602)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1419)
> at
> org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:584)
> {code}
> If I am correct, the problem was already addressed in SOLR-8807. The fix does
> was not working in this case though, because of a syntax error in the query
> (I used the local parameter syntax twice instead of combining it). The
> relevant part of the query is:
> {code:java}
> &fq={!tag=collapser}{!collapse field=productId sort='merchantOrder asc, price
> asc, id asc'}
> {code}
> After discussing that on the mailing list, I was asked to open a ticket,
> because this situation should result in a bad request instead of a
> NullpointerException (see
> [https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201911.mbox/%3CCAMJgJxTuSb%3D8szO8bvHiAafJOs08O_NMB4pcaHOXME4Jj-GO2A%40mail.gmail.com%3E])
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