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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2617) coord should still apply to missing terms/clauses
Date Tue, 24 Aug 2010 14:18:18 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12901896#action_12901896
] 

Michael McCandless commented on LUCENE-2617:
--------------------------------------------

Amazingly, I just hit a random test failure (seed = 5148889059941714836L reproduces it):

{noformat}
    [junit] Testsuite: org.apache.lucene.search.TestMultiSearcherRanking
    [junit] Testcase: testTwoTermQuery(org.apache.lucene.search.TestMultiSearcherRanking):
FAILED
    [junit] expected:<0.48314467> but was:<0.60746753>
    [junit] junit.framework.AssertionFailedError: expected:<0.48314467> but was:<0.60746753>
    [junit] 	at org.apache.lucene.search.TestMultiSearcherRanking.checkQuery(TestMultiSearcherRanking.java:102)
    [junit] 	at org.apache.lucene.search.TestMultiSearcherRanking.testTwoTermQuery(TestMultiSearcherRanking.java:47)
    [junit] 	at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:380)
    [junit] 	at org.apache.lucene.util.LuceneTestCase.run(LuceneTestCase.java:372)
{noformat}

The failure is in fact caused by this issue!  (The patch fixes it).  The RandomIndexWriter
in this test w/ the above seed creates a multi-segment index, and then tests on a 2-term BQ.
 Some segments did/didn't have both of the terms and this causes the score difference.

So...  I think we really should fix this, for consistency.  Otherwise, how your docs fall
into segments can alter your scores, which is awful.

> coord should still apply to missing terms/clauses
> -------------------------------------------------
>
>                 Key: LUCENE-2617
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2617
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Yonik Seeley
>         Attachments: LUCENE-2617.patch
>
>
> Missing terms in a boolean query "disappear" (i.e. they don't even affect the coord factor).

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