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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910717#action_12910717
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Yonik Seeley commented on LUCENE-2649:
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If ya care - don't pass a null parser! Otherwise you get the default.
bq. This is OpenBitSet.cardinality()
Which isn't free... and calculating it over and over again is silly if you care
about those numbers.
bq. I dont think we should add this extra cost during creation,
I don't think it will add extra cost. I could be wrong, but I don't think it
will be measurable.
> 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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