[jira] [Created] (LUCENE-6529) NumericFields + SlowCompositeReaderWrapper + UninvertedReader + -Dtests.codec=random can results in incorrect SortedSetDocValues

["Hoss Man (JIRA)" <ji...@apache.org>]

Hoss Man created LUCENE-6529:
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             Summary: NumericFields + SlowCompositeReaderWrapper + UninvertedReader + -Dtests.codec=random can results in incorrect SortedSetDocValues 
                 Key: LUCENE-6529
                 URL: https://issues.apache.org/jira/browse/LUCENE-6529
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Hoss Man


Digging into SOLR-7631 and SOLR-7605 I became fairly confident that the only explanation of the behavior i was seeing was some sort of bug in either the randomized codec/postings-format or the UninvertedReader, that was only evident when two were combined and used on a multivalued Numeric Field using precision steps.  But since i couldn't find any -Dtests.codec or -Dtests.postings.format options that would cause the bug 100% regardless of seed, I switched tactices and focused on reproducing the problem using UninvertedReader directly and checking the SortedSetDocValues.getValueCount().

I now have a test that fails frequently (and consistently for any seed i find), but only with -Dtests.codec=random -- override it with -Dtests.codec=default and everything works fine (based on the exhaustive testing I did in the linked issues, i suspect every named codec works fine - but i didn't re-do that testing here)

The failures only seem to happen when checking the SortedSetDocValues.getValueCount() of a SlowCompositeReaderWrapper around the UninvertedReader -- which suggests the root bug may actually be in SlowCompositeReaderWrapper? (but still has some dependency on the random codec)





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