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From "Uwe Schindler (JIRA)" <>
Subject [jira] Commented: (LUCENE-2649) FieldCache should include a BitSet for matching docs
Date Wed, 22 Sep 2010 18:35:39 GMT


Uwe Schindler commented on LUCENE-2649:

It's not more complicated its easier. The Bits are a real separate thing, its just a cache
of the information, if values are assigned or not. It does not depend on the data type like
byte, int,... Its just separate. And as said before, if somebody requests the same field in
different types, it would only have one bits. Also one could request the Bits alone, or could
first request a field without bits (using a boolean) and later again with bits, in which case
those are lazily loaded

Th implementation would be simple, similar to the way, how the caches are filled for NumericFields
(it adds the values two times to the cache, with the null parser and the real used parser).
I this case youl would simply request the bits cache on e.g. the int[] creation, if not availabe,
also build the bits in parallel and add to bits cache.

> FieldCache should include a BitSet for matching docs
> ----------------------------------------------------
>                 Key: LUCENE-2649
>                 URL:
>             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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