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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913647#action_12913647
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Michael McCandless commented on LUCENE-2649:
--------------------------------------------
bq. My motivation is for supporting the supportMissingLast feature in solr
sorting (that could now be pushed to lucene).
{quote}
If folks think that being able to tell a real "0" from a missing value is not
useful for Lucene, we
could extend Ryan's CacheConfig to include a factory method that creates /
populates ByteValues, IntValues, etc.
Then all the bitset stuff could be kept in Solr only. I'm sensitive about
pushing stuff into Lucene that is *only* useful for Solr.
{quote}
I'm very much +1 for making this (exposing thea valid bitset) possible
in Lucene.
Users have asked over time how they can tell if a given doc has a field value.
And being able to distinguish missing values, eg to sort them last, or
to do something else, is useful. Once we do this we should also
[eventually] move "sort missing last" capability into Lucene's
comparators.
> FieldCache should include a BitSet for matching docs
> ----------------------------------------------------
>
> Key: LUCENE-2649
> URL: https://issues.apache.org/jira/browse/LUCENE-2649
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Ryan McKinley
> Fix For: 4.0
>
> Attachments: LUCENE-2649-FieldCacheWithBitSet.patch,
> LUCENE-2649-FieldCacheWithBitSet.patch,
> LUCENE-2649-FieldCacheWithBitSet.patch,
> LUCENE-2649-FieldCacheWithBitSet.patch, LUCENE-2649-FieldCacheWithBitSet.patch
>
>
> The FieldCache returns an array representing the values for each doc.
> However there is no way to know if the doc actually has a value.
> This should be changed to return an object representing the values *and* a
> BitSet for all valid docs.
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