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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1821) Weight.scorer() not passed doc offset for "sub reader"
Date Tue, 18 Aug 2009 22:24:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744755#action_12744755
] 

Mark Miller commented on LUCENE-1821:
-------------------------------------

I'd go with your solution then - I'd hate to expose doc base stuff on Searcher or in Scorer
(I'm not a big fan of gatherSubReaders being protected either).

Also, *we* can't put Searcher on a Weight - it needs to be serializable (though you can if
you don't need to count on that).

Where do you suggest we should place a warning that we havn't? I don't think we ever intended
to support the use of external ids.

I think your use case is fairly special, and I'm not sure we should expose per segment stuff
where we don't have to.

It is an interesting use case though - maybe someone else will chime in.

> Weight.scorer() not passed doc offset for "sub reader"
> ------------------------------------------------------
>
>                 Key: LUCENE-1821
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1821
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: 2.9
>            Reporter: Tim Smith
>
> Now that searching is done on a per segment basis, there is no way for a Scorer to know
the "actual" doc id for the document's it matches (only the relative doc offset into the segment)
> If using caches in your scorer that are based on the "entire" index (all segments), there
is now no way to index into them properly from inside a Scorer because the scorer is not passed
the needed offset to calculate the "real" docid
> suggest having Weight.scorer() method also take a integer for the doc offset
> Abstract Weight class should have a constructor that takes this offset as well as a method
to get the offset
> All Weights that have "sub" weights must pass this offset down to created "sub" weights

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