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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4607) Add estimateDocCount to DocIdSetIterator
Date Mon, 10 Dec 2012 16:09:20 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528032#comment-13528032
] 

Simon Willnauer commented on LUCENE-4607:
-----------------------------------------

bq. The other idea (just for discussion) would be "number of i/os".
I like this, yet I think in that case we should go back to estimateCost rather than docId
etc. since for a bitset this is way different that for a PhraseScorer. I agree it should be
a unit of work that we estimate.
                
> Add estimateDocCount to DocIdSetIterator
> ----------------------------------------
>
>                 Key: LUCENE-4607
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4607
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/search
>    Affects Versions: 4.0
>            Reporter: Simon Willnauer
>             Fix For: 4.1, 5.0
>
>         Attachments: LUCENE-4607.patch
>
>
> this is essentially a spinnoff from LUCENE-4236
> We currently have no way to make any decsision on how costly a DISI is neither when we
apply filters nor when we build conjunctions in BQ. Yet we have most of the information already
and can easily expose them via a cost API such that BS and FilteredQuery can apply optimizations
on per segment basis.

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