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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913503#action_12913503
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Robert Muir commented on LUCENE-2649:
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bq. Also set the Lucene default to true, as I want to improve sorting and FCRF.
bq. I know it's only 3% (for ints... 12.5% for bytes), but, 3% here, 3% there
and suddenly we're talking real money.
I'm having trouble understanding the use case for this bitset.
The jira issue says to add a bitset, but doesnt explain why.
The linked thread talks about this being useful for sorting missing values
last, but I don't think this justifies
increasing the size of fieldcache by default.
> 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
>
>
> 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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