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From "Simon Willnauer (JIRA)" <>
Subject [jira] Commented: (LUCENE-2649) FieldCache should include a BitSet for matching docs
Date Fri, 17 Sep 2010 13:27:32 GMT


Simon Willnauer commented on LUCENE-2649:

bp. Perhaps FieldCache.Parser was originally just too narrow in scope - it should have been
a factory method for handling all decisions about creating and populating a field cache entry?
I guess we need to be able to manually configure FieldCache with some kind of FieldType. There
have been several issues mentioning this and it keeps coming up again and again. I think it
is just time to rethink Fieldable / Field and move towards some kind of flexible type definition
for Fields in Lucene. A FieldType could then have a FieldCache Attribute which contains all
necessary info including the parser and flags like the one we are talking about. Yet, before
I get too excieted about FieldType, yeah something with a wider scope than FieldCache.Parser
would work in this case. I don't know how far the FieldType is away but it can eventually
replace whatever is going to be implemented here in regards to that flag. 

I think by default we should not enable the Bits feature but it must be explicitly set via
whatever mechanism we gonna use.

> 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
> 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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