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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914095#action_12914095
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Ryan McKinley commented on LUCENE-2649:
---------------------------------------
{quote}
I think getCachePopulator() should be under EntryConfig - that way people can
provide their own (and extend ByteValues to include more info)
{quote}
So you think it is better for *each* call to define how the cache works rather
then having that as an attribute of the FieldCache (that could be extended).
The on thing that concerns me is that that forces all users of the FieldCache
to be in sync.
In this proposal, you could set the CachePopulator on the FieldCache.
{quote}
Otherwise, we'll forever be locked into a lowest common denominator of only
adding info that everyone can agree on.
{quote}
This is why I just added the 'createXxxxValues' functions on CachePopulator --
a subclass could add other values.
------------
It looks like the basic difference between what we are thinking is that the
Populator is attached to the FieldCache rather then each call to the
FieldCache. From my point of view, this would make it easier for system with a
schema (like solr) have consistent results across all calls, rather then making
each request to the FieldCache need to know about the schema -> parsers ->
populator
but I can always be convinced ;)
> 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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