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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12911128#action_12911128
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Ryan McKinley commented on LUCENE-2649:
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I thought of an optimization that could reduce memory usage...
If all non-deleted documents have a value, we don't need a real BitSet -- just
a Bits implementation that always returns true.
That should save 3% (or 12.5%) here and there.
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On other thing to consider... do we want to remove the getXXXX functions that
do not pass in a Parser? passing in null, is equivalent?
> 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
>
>
> 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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