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Date: Fri, 17 Sep 2010 14:01:44 -0400 (EDT)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2649) FieldCache should include a BitSet
 for matching docs
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    [ https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910699#action_12910699 ] 

Yonik Seeley commented on LUCENE-2649:
--------------------------------------

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

The cheapest option might be:

{quote}
  public interface Parser extends Serializable {
    public boolean recordMissing();
  }
{quote}

A better option is to replace FieldCache.Parser in SortField to be FieldCache.EntryCreator.

Oh, and if we're recording all the set bits, it would be really nice to record both
- the number of values set
- the number of unique values encountered

Both should be zero or non-measurable cost (a counter++ that does not produce a data dependency can be executed in parallel on a free int execution unit)


> 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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