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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910576#action_12910576
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Yonik Seeley commented on LUCENE-2649:
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bq. I guess we need to be able to manually configure FieldCache with some kind
of FieldType.
I don't know how well that would work. For one, there's only one FieldCache,
so configuring it with anything seems problematic.
Also, if I have to list out all the fields I'm going to use, that's another big
step backwards.
A factory would be a pretty straightforward way to increase the power, by
allowing users to populate the entry through any mechanism, and optionally do
extra calculations when the entry is populated (think statistics,
sum-of-squares, etc).
> 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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