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https://issues.apache.org/jira/browse/LUCENE-4717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561983#comment-13561983
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Robert Muir commented on LUCENE-4717:
-------------------------------------
I committed a fix to detect and correct this to the branch I'm happy with:
http://svn.apache.org/viewvc?view=revision&revision=1438195
We can resolve it when LUCENE-4547 lands.
> Lucene40's DocValues (sometimes?) have a bogus extra ordinal
> ------------------------------------------------------------
>
> Key: LUCENE-4717
> URL: https://issues.apache.org/jira/browse/LUCENE-4717
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0, 4.1
> Reporter: Robert Muir
> Fix For: 4.2
>
>
> I committed the following commented out check in CheckIndex:
> {noformat}
> if (seenOrds.cardinality() != sortedValues.getValueCount()) {
> // TODO: find the bug here and figure out a workaround (we can
> implement in LUCENE-4547's back compat layer maybe)
> // basically ord 0 is unused by any docs: so the sortedbytes ords are
> all off-by-one
> // does it always happen? e.g. maybe only if there are missing
> values? or a bug in its merge optimizations?
> // throw new RuntimeException("dv for field: " + fieldName + " has
> holes in its ords, valueCount=" + sortedValues.getValueCount() + " but only
> used: " + seenOrds.cardinality());
> }
> {noformat}
> I'd really like to have this check in CheckIndex, and so it would be great to
> understand the conditions when the bug happens, and if we can correct it
> on-the-fly in Lucene40DocValuesReader in LUCENE-4547 branch... otherwise we
> will have to conditionalize the check based on when the segment was written
> (it will ultimately be corrected on merge, just annoying)
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