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From "Tim Smith (JIRA)" <>
Subject [jira] Commented: (LUCENE-1821) Weight.scorer() not passed doc offset for "sub reader"
Date Wed, 19 Aug 2009 12:48:14 GMT


Tim Smith commented on LUCENE-1821:

Concerning the changelog, i feel the below should be added to the "Changes in runtime behavior"
section (it's kinda specified in "New features", however
it is also a rather substantial change in the runtime behavior and should be called out explicitly

 13. LUCENE-1483: When searching over multiple segments, a new Scorer is created for each
        The Weight is created only once for the top level searcher. Each Scorer is passed
the per-segment IndexReader.
        This will result in docids in the Scorer being internal to the per-segment IndexReader
and there is currently no way
         to rebase these docids to the top level IndexReader. This results in any caches/filters
that use docids over the top 
         IndexReader to be broken.

> Weight.scorer() not passed doc offset for "sub reader"
> ------------------------------------------------------
>                 Key: LUCENE-1821
>                 URL:
>             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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