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From "Helen Warren (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-538) Using WildcardQuery with MultiSearcher, and Boolean MUST_NOT clause
Date Tue, 04 Apr 2006 10:33:43 GMT
Using WildcardQuery with MultiSearcher, and Boolean MUST_NOT clause
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         Key: LUCENE-538
         URL: http://issues.apache.org/jira/browse/LUCENE-538
     Project: Lucene - Java
        Type: Bug

  Components: Search  
    Versions: 1.9    
 Environment: Ubuntu Linux, java version 1.5.0_04
    Reporter: Helen Warren
 Attachments: TestMultiSearchWildCard.java

We are searching across multiple indices using a MultiSearcher. There seems to be a problem
when we use a WildcardQuery to exclude documents from the result set. I attach a set of unit
tests illustrating the problem.

In these tests, we have two indices. Each index contains a set of documents with fields for
'title',  'section' and 'index'. The final aim is to do a keyword search, across both indices,
on the title field and be able to exclude documents from certain sections (and their subsections)
using a
WildcardQuery on the section field.
 
 e.g. return documents from both indices which have the string 'xyzpqr' in their title but
which do not lie
 in the news section or its subsections (section = /news/*).
 
The first unit test (testExcludeSectionsWildCard) fails trying to do this.
 If we relax any of the constraints made above, tests pass:
 
* Don't use WildcardQuery, but pass in the news section and it's child section to exclude
explicitly (testExcludeSectionsExplicit)</li>
* Exclude results from just one section, not it's children too i.e. don't use WildcardQuery(testExcludeSingleSection)</li>
* Do use WildcardQuery, and exclude a section and its children, but just use one index thereby
using the simple
   IndexReader and IndexSearcher objects (testExcludeSectionsOneIndex).
* Try the boolean MUST clause rather than MUST_NOT using the WildcardQuery i.e. only include
results from the /news/ section
   and its children.

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