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From "Ryan McKinley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2649) FieldCache should include a BitSet for matching docs
Date Fri, 17 Sep 2010 21:45:34 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910803#action_12910803
] 

Ryan McKinley commented on LUCENE-2649:
---------------------------------------

Maybe, but I'm still not sure this cleans things up enough to be worth the trouble -- ideally
the API should be easy to have consistent results.  I don't like that it would be too easy
to mess things up if you the application does not use the same parser from various components
(that may be in different libraries etc).  Conceptually it makes sense to have settings about
what is or is not cached attached to the FieldCache itself, not to the things that ask the
FieldCache for its values -- and letting whoever asks first set the behavior for the next
guy who asks (regardless of what they ask for!).  

If we are going to make it essentially required to always pass in the right Parser/EntryCreator,
we should at least remove all the ways of not passing one in -- since that call is saying
"use what ever is there, and the next guy who asks should be ok with it too"

Does something like the EntryCreator idea fix -- or at least begin to fix -- the other FieldCache
issues?  If not, is it really worth introducing just to avoid a static variable?

I think the best near term option is live with the static initializer, and fix it when the
we rework the FieldCache to fix a host of other issues.  For solr the default will be set
to always calculate, for lucene... we will let Mike and Uwe duke it out :)









> 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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