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https://issues.apache.org/jira/browse/LUCENE-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated LUCENE-3831:
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Attachment: TestNullFieldAfterRegexpRewrite.java
Here's a test case. The error is thrown in SpanQuery.createWeight() when it's
called on a bare SpanMultiTermQueryWrapper.
It looks as though a simple workaround is to always wrap
SpanMultiTermQueryWrapper in a SpanOrQuery.
Maybe SpanOrQuery should not have a default constructor, but should require a
fieldname if no clauses are supplied?
> 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: TestNullFieldAfterRegexpRewrite.java,
> 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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