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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910513#action_12910513
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Michael McCandless commented on LUCENE-2649:
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Looks great!
Should we make it optional, whether the valid bitset should be computed? Many
apps wouldn't need it, so it just ties up (admittedly smallish amounts of) RAM
unnecessarily?
bq. Lucene's sorting Collectors can be improved to have a consistent behaviour
for missing values (like Solr's sortMissingFirst/Last).
+1
Shouldn't we pull Solr's sortMissingFirst/Last down into Lucene?
> 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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