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https://issues.apache.org/jira/browse/LUCENE-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13109402#comment-13109402
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Michael McCandless commented on LUCENE-3390:
--------------------------------------------
I would love to take this even further, and have trunk's FC implement missing
values the same way 3.x does (ie, separate FC method to getUnvaluedDocs, rather
than bundling this bitset w/ the computation of the values array). But we
should do that separately.
This is actually a serious bug; maybe we should release 3.4.1 soon (this would
also fix the Maven packaging problem in 3.4.0).
Why did we need to narrow the return value from FC.getUnvaluedDocs to
FixedBitSet?
> Incorrect sort by Numeric values for documents missing the sorting field
> ------------------------------------------------------------------------
>
> Key: LUCENE-3390
> URL: https://issues.apache.org/jira/browse/LUCENE-3390
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/search
> Affects Versions: 3.3
> Reporter: Gilad Barkai
> Assignee: Doron Cohen
> Priority: Minor
> Labels: double, float, int, long, numeric, sort
> Fix For: 3.4
>
> Attachments: LUCENE-3390-fix-like-trunk.patch,
> LUCENE-3390-fix-like-trunk.patch, LUCENE-3390-fix-like-trunk.patch,
> LUCENE-3390-fix-like-trunk.patch, LUCENE-3390.patch, SortByDouble.java
>
>
> While sorting results over a numeric field, documents which do not contain a
> value for the sorting field seem to get 0 (ZERO) value in the sort. (Tested
> against Double, Float, Int & Long numeric fields ascending and descending
> order).
> This behavior is unexpected, as zero is "comparable" to the rest of the
> values. A better solution would either be allowing the user to define such a
> "non-value" default, or always bring those document results as the last ones.
> Example scenario:
> Adding 3 documents, 1st with value 3.5d, 2nd with -10d, and 3rd without any
> value.
> Searching with MatchAllDocsQuery, with sort over that field in descending
> order yields the docid results of 0, 2, 1.
> Asking for the top 2 documents brings the document without any value as the
> 2nd result - which seems as a bug?
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