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https://issues.apache.org/jira/browse/LUCENE-6001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14242387#comment-14242387
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Stuart commented on LUCENE-6001:
--------------------------------
We've been seeing this issue semi-regularly in our app. We've been working
around it so far by simplifying our queries to remove clauses (probably a good
idea anyway) but we can never be sure our users won't find a way to break it!
> DrillSideways throws NullPointerException for some searches
> -----------------------------------------------------------
>
> Key: LUCENE-6001
> URL: https://issues.apache.org/jira/browse/LUCENE-6001
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/facet
> Affects Versions: 4.10.1
> Reporter: Dragan Jotanovic
>
> For some DrillSideways searches I get NullPointerException.
> I have tracked the problem to DrillSidewaysScorer class, on line 126 in
> DrillSidewaysScorer.java:
> long baseQueryCost = baseScorer.cost();
> On some of my index segments, this call throws NullPoinerException.
> "baseScorer" is instance of ReqExclScorer.
> In ReqExclScorer.java:
> public long cost() {
> return reqScorer.cost();
> }
> throws NullPointerException because reqScorer is null.
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