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From "Luc Vanlerberghe (JIRA)" <>
Subject [jira] Created: (LUCENE-453) Using MultiSearcher and ParallelMultiSearcher can change the sort order.
Date Wed, 12 Oct 2005 17:07:04 GMT
Using MultiSearcher and ParallelMultiSearcher can change the sort order.

         Key: LUCENE-453
     Project: Lucene - Java
        Type: Bug
  Components: Search  
    Versions: CVS Nightly - Specify date in submission    
 Environment: Checked with revision 314961 on 2005-10-12
    Reporter: Luc Vanlerberghe

When using multiple sort criteria the first criterium that indicates a difference should be
When a field does not exist for a given document, special rules apply.
>From what I see in the code, it is sorted as 0 for integer and float fields, and null
Strings are sorted before others.

This works correctly in both Lucene 1.4.3 and in trunk as long as you use a single IndexSearcher
(except perhaps in special cases, see other bug reports like LUCENE-374).

However, in MultiSearcher and ParallelMultiSearcher, the results of the separate IndexSearchers
are merged and there an error occurs.
The bug is located in FieldDocSortedHitQueue.

It can even be demonstrated by passing a single indexSearcher to a MultiSearcher.

TestCase and patch follow.

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