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https://issues.apache.org/jira/browse/LUCENE-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated LUCENE-6984:
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Attachment: LUCENE-6984.patch
Here's a patch that changes SpanMTQWrapper to have its own RewriteMethod, and
to use that for rewriting rather than delegating down to the wrapped query.
I'll open a separate issue to make MTQ and SpanMTQWrapper immutable in trunk.
> MultiTermQuery mutability can cause assertion failures in BooleanQuery
> ----------------------------------------------------------------------
>
> Key: LUCENE-6984
> URL: https://issues.apache.org/jira/browse/LUCENE-6984
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Alan Woodward
> Attachments: LUCENE-6984.patch
>
>
> BooleanQuery caches its hashcode on the grounds that it is immutable.
> However, this immutability doesn't hold if some of its clauses hold queries
> that are not themselves immutable - for example, a MultiTermQuery with a
> changeable rewrite method. If one of these clauses is mutated after the
> hashcode has been calculated, then the next time the parent BooleanQuery is
> used the assertion in BooleanQuery.hashCode() will fail.
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