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Date: Tue, 15 Nov 2011 21:35:51 +0000 (UTC)
From: "Simon Willnauer (Commented) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (LUCENE-3572) MultiIndexDocValues pretends it
 can merge sorted sources
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    [ https://issues.apache.org/jira/browse/LUCENE-3572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150792#comment-13150792 ] 

Simon Willnauer commented on LUCENE-3572:
-----------------------------------------

+1 patch looks good to me
                
> MultiIndexDocValues pretends it can merge sorted sources
> --------------------------------------------------------
>
>                 Key: LUCENE-3572
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3572
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.0
>
>         Attachments: LUCENE-3572.patch
>
>
> Nightly build hit this failure:
> {noformat}
> ant test-core -Dtestcase=TestSort -Dtestmethod=testReverseSort -Dtests.seed=791b126576b0cfab:-48895c7243ecc5d0:743c683d1c9f7768 -Dtests.multiplier=3 -Dargs="-Dfile.encoding=ISO8859-1"
>     [junit] Testcase: testReverseSort(org.apache.lucene.search.TestSort):	Caused an ERROR
>     [junit] expected:<[CEGIA]> but was:<[ACEGI]>
>     [junit] 	at org.apache.lucene.search.TestSort.assertMatches(TestSort.java:1248)
>     [junit] 	at org.apache.lucene.search.TestSort.assertMatches(TestSort.java:1216)
>     [junit] 	at org.apache.lucene.search.TestSort.testReverseSort(TestSort.java:759)
>     [junit] 	at org.apache.lucene.util.LuceneTestCase$3$1.evaluate(LuceneTestCase.java:523)
>     [junit] 	at org.apache.lucene.util.LuceneTestCaseRunner.runChild(LuceneTestCaseRunner.java:149)
>     [junit] 	at org.apache.lucene.util.LuceneTestCaseRunner.runChild(LuceneTestCaseRunner.java:51)
> {noformat}
> It's happening in the test for reverse-sort of a string field with DocValues, when the test had gotten SlowMultiReaderWrapper.
> I committed a fix to the test to avoid testing this case, but we need a better fix to the underlying bug.
> MultiIndexDocValues cannot merge sorted sources (I think?), yet somehow it's pretending it can (in the above test, the three subs had BYTES_FIXED_SORTED type, and the TypePromoter happily claims to merge these to BYTES_FIXED_SORTED; I think MultiIndexDocValues should return null for the sorted source in this case?

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