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https://issues.apache.org/jira/browse/LUCENE-2756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-2756:
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Attachment: LUCENE-2756_testcase.patch
attached is a simple test, it adds a single document "foo bar" to one index,
and another document "foo baz" to another.
if you do the query "+foo -ba*", the multisearcher rewrites this to:
(+field:foo -field:baz) (+field:foo -field:bar)
This causes both documents to match the query, when really neither should.
instead the query should be (+field:foo -field:baz -field:bar)
if you run the test with -Dtests.verbose=true you can see the rewritten form.
the reason this only appeared with a certain document count for the issue on the
user's list is because they were using CONSTANT_SCORE_AUTO and with that
document count it was deciding to use a constant-score boolean rewrite method.
> MultiSearcher.rewrite() incorrectly rewrites queries
> ----------------------------------------------------
>
> Key: LUCENE-2756
> URL: https://issues.apache.org/jira/browse/LUCENE-2756
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Reporter: Robert Muir
> Attachments: LUCENE-2756_testcase.patch
>
>
> This was reported on the userlist, in the context of range queries.
> Its also easy to make our existing tests fail with my patch on LUCENE-2751:
> {noformat}
> ant test-core -Dtestcase=TestBoolean2 -Dtestmethod=testRandomQueries
> -Dtests.seed=7679849347282878725:-903778383189134045
> {noformat}
> The fundamental problem is that MultiSearcher first rewrites against
> individual subs,
> then uses Query.combine() which simply OR's these sub-clauses.
> This is incorrect for expanded MUST_NOT queries (e.g. from wildcard), as it
> violates demorgan's law.
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