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Date: Wed, 12 Oct 2005 19:16:05 +0200 (CEST)
From: "Luc Vanlerberghe (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-453) Using MultiSearcher and
 ParallelMultiSearcher can change the sort order.
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     [ http://issues.apache.org/jira/browse/LUCENE-453?page=all ]

Luc Vanlerberghe updated LUCENE-453:
------------------------------------

    Attachment: FieldDocSortedHitQueue.diff

This fixes the case where both Strings are null.


> Using MultiSearcher and ParallelMultiSearcher can change the sort order.
> ------------------------------------------------------------------------
>
>          Key: LUCENE-453
>          URL: http://issues.apache.org/jira/browse/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
>  Attachments: FieldDocSortedHitQueue.diff, TestSort.diff
>
> When using multiple sort criteria the first criterium that indicates a difference should be used.
> 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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