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https://issues.apache.org/jira/browse/LUCENE-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218171#comment-13218171
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Michael McCandless commented on LUCENE-3831:
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Hmm I don't think the Fields.terms API should be expected to accept null (eg I
don't know if the other codecs will NPE).
I'd rather fix span queries to not pass the null field. Is this happening in
SpanTermQuery.getSpans()?
> Passing a null fieldname to MemoryFields#terms in MemoryIndex throws a NPE
> --------------------------------------------------------------------------
>
> Key: LUCENE-3831
> URL: https://issues.apache.org/jira/browse/LUCENE-3831
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0
> Reporter: Alan Woodward
> Assignee: Michael McCandless
> Priority: Minor
> Attachments: mindex-null-field.patch
>
>
> I found this when querying a MemoryIndex using a RegexpQuery wrapped by a
> SpanMultiTermQueryWrapper. If the regexp doesn't match anything in the
> index, it gets rewritten to an empty SpanOrQuery with a null field value,
> which then triggers the NPE.
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