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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910598#action_12910598
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Yonik Seeley commented on LUCENE-2649:
--------------------------------------

bq. Whatever you call it (using Factory is fine) but isn't that what you 
mentioned to be insufficient? I mean this is something you would pass to a 
FieldCache.getXXX, right? 

I was suggesting handling it the same way as FieldCache.Parser - it's set on 
the SortField.  But instead of just being able to control parsing of a term 
(which is too limited), it needs to be able to control everything. (This would 
solve Shai's needs too)

> 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
>
>
> 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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