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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
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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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