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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910625#action_12910625
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Shai Erera commented on LUCENE-2649:
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bq. Are there any advantages to using payloads over CSF for fieldcache
population?
Well .. payloads already exist (in my code :)), while CSF is "just around the
corner" for a long time. While the two ultimately achieve the same goal, CSF is
more generic than just payloads, and if we'd want to take advantage of it w/
FieldCache, I assume we'll need to make more changes to FieldCache, because w/
CSF, people can store arbitrary byte[] and request to cache them. So sorting
data is a subset of CSF indeed, but I think the road to CSF + CSF-FieldCache
integration is long. But perhaps I'm not up-to-date and there is progress /
someone actually working on CSF?
Anyway, opening up FC to read from payloads seems to me a much easier solution,
because besides reading the stuff from the payload, the rest of the classes
continue to work the same (TopFieldCollector, Comparators etc.).
Maybe a slight change to SortField will be required as well though, not sure
yet.
> 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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