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https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913699#action_12913699
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Uwe Schindler commented on LUCENE-2649:
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I think it should be a separate entry in the cache. Only that its only
regenerated, if it does not already exist for the field/IR combination. So
there are these combinations:
- cache is purged (inititially)
- user calls getBytes(field) -> bytes[] is filled, also the Bits
- user calls additionally getInts(field) for some reason -> int[] is filled,
but as Bits already exit they dont need to be filled
- user calls getBits(field) -> returns the pre-filled bits from one of the
previous calls
Alternatively:
- Cache is purged (initially)
- User calls getBits(field), there are no bits available until now, bits are
populated from TermEnum/TermDocs, but no byte[] or int[], as not requested
With a config option, one could switch automatic polulation of Bits off, so in
the first combination, only the last call to getBits() would populate bit set.
I all cases this is easily possible by having a separate cache with separate
population method for the bits. If some method like getBytes() also populates
the Bits, it should simply add the created Bits manually to the cache.
Does this sound like a plan?
> 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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