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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913680#action_12913680
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Michael McCandless commented on LUCENE-2649:
--------------------------------------------

bq.  So how about we add a getBits(field) method to FieldCache that returns the 
valid docs. 

This would be great!

Assuming we separately cache the valid docs, we could then allow caching *only* 
valid docs, for apps that want to know if a doc has a value but do not need the 
full array of values RAM resident.

> 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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