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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1300) Negative wildcard searches on MultiSearcher not eliminating correctly.
Date Fri, 06 Jun 2008 19:50:45 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12603157#action_12603157
] 

Mark Miller commented on LUCENE-1300:
-------------------------------------

Great catch Steve. The combine method in Query appears to be very flawed when it comes to
MUST_NOT occurrences and truncation queries. Nasty little bug that does indeed appear to go
back to 05. Thanks for all of the detailed info. I am sure someone will be right on top of
this.

> 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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