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https://issues.apache.org/jira/browse/LUCENE-1300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624349#action_12624349
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Mark Miller commented on LUCENE-1300:
-------------------------------------
This is actually a dupe of an older issue.
There is no clean way to fix it with the current Searchable API. Avoid
MultiSearcher if you can <g>
> Negative wildcard searches on MultiSearcher not eliminating correctly.
> ----------------------------------------------------------------------
>
> Key: LUCENE-1300
> URL: https://issues.apache.org/jira/browse/LUCENE-1300
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 2.1, 2.3, 2.3.1
> Environment: Windows XP, cygwin.
> Reporter: steve halsey
> Priority: Minor
> Attachments: TestMultiSearcherNegativeWildcardQueryExpansion.java,
> TestMultiSearcherNegativeWildcardQueryExpansionWorksWith151.java
>
>
> If you do a search for a negative wildcard query on a MultiSearcher where
> one of the searchers is empty e.g. "lucene -bug*" the hits returned
> incorrectly include articles with words that should be eliminated, e.g.
> "bug" and "bugs". This is because the query expansion is done on the index
> with docs in and the empty ndex *separately* and then combined as an OR to be
> run on the MultiSearcher. This incorrectly lets in docs that have the
> excluded wildcard terms, e.g. "bug" nd bugs". This bug would also show up
> with two indexes full of docs, and I can send a test to show that if
> required, but I think this test demonstrates the bug in the implest way.
> The attached class TestMultiSearcherNegativeWildcardQueryExpansion.java can
> be put in with other tests in org.apache.lucene.search and run and will fail,
> showing the bug exists.
> I have tested this bug with the currently unreleased 2.3.2 and the released
> 2.1 and 2.3.1 and it fails on all.
> With lucene-1.5-rc1 it passes (with mods to make it work with old API) see
> TestMultiSearcherNegativeWildcardQueryExpansionWorksWith151.java attachment.
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