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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