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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914179#action_12914179
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Yonik Seeley commented on LUCENE-2649:
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Uwe, I think we need to keep the native arrays.
bq. Java 6 will hopefully optimize away the additional method call
It only does if you have *one* implementation at the point where it is used.
We just got done specializing the ord sorting code with native arrays because
of this - the speed hit was really non-trivial, and it happened with the latest
versions of all of the JVMs I tested (oracle 1.6, oracle 1.7, ibm 1.6). I see
no relief for this issue on the horizon.
> 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, 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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