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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913698#action_12913698
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Michael McCandless commented on LUCENE-2649:
--------------------------------------------

bq. If we have a separate getBits( field ) call, should the Bits be added to 
the XxxValues class? I suspect not.

Yeah I think it need not be.

But, EntryCreator still should be able to state that it'd like the bits 
computed & cached as a side effect?  And, if the bits wasn't already computed, 
then they'd be computed on-demand?  (This enables caching only valid bits and 
not the values array).

If we do this then we can leave cutover to XXXValues (still a good idea) as a 
separate issue?

> 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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