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https://issues.apache.org/jira/browse/LUCENE-3504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-3504.
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Resolution: Won't Fix
> DocValues: deref/sorted bytes types shouldn't return empty byte[] when doc
> didn't have a value
> ----------------------------------------------------------------------------------------------
>
> Key: LUCENE-3504
> URL: https://issues.apache.org/jira/browse/LUCENE-3504
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.0
>
>
> I'm looking at making a FieldComparator that uses DV's SortedSource to
> sort by string field (ie just like TermOrdValComparator, except using
> DV instead of FieldCache). We already have comparators for DV int and
> float DV fields.
> But one thing I noticed is we can't detect documents that didn't have
> any value indexed vs documents that had empty byte[] indexed.
> This is easy to fix (and we used to do this), because these types are
> deref'd (ie, each doc stores an address, and then separately looks up
> the byte[] at that address), we can reserve ord/address 0 to mean "doc
> didn't have the field". Then we should return null when you retrieve
> the BytesRef value for that field.
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