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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-453) Using MultiSearcher and ParallelMultiSearcher can change the sort order.
Date Tue, 18 Oct 2005 20:17:44 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-453?page=comments#action_12332408 ] 

Yonik Seeley commented on LUCENE-453:
-------------------------------------

most of the other cases are guaranteed to never have null values (except for perhaps CUSTOM)?

> 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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