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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2649) FieldCache should include a BitSet for matching docs
Date Fri, 17 Sep 2010 17:29:35 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910677#action_12910677
] 

Michael McCandless commented on LUCENE-2649:
--------------------------------------------

I know it's only 3% (for ints... 12.5% for bytes), but, 3% here, 3% there and suddenly we're
talking real money.

Lucene can only stay lean and mean if we don't allow these little 3% losses here and there!!

Let's try to find some baby-step (even if not clean -- we know FieldCache, somehow, needs
to be fixed more generally) for today?


> 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
>
>
> 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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