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https://issues.apache.org/jira/browse/LUCENE-1821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744759#action_12744759
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Tim Smith commented on LUCENE-1821:
-----------------------------------
I'll prepare a patch in the morning (unless someone beats me to it) and look
over the changelog then to suggest some more disclaimers (if what's there isn't
sufficient)
I don't hold the contract that Weight be serializable (so i'm safe there)
i agree that per-segment is the way to go in general and should be as tight as
possible (as long as i can get my mits on the "sub readers")
but there are use cases that still require looking at the index as a whole as
well
especially if you need to know the number of unique terms for a field, or
otherwise need documents in one segment to be aware of documents in other
segments (i could probably come up a bunch more use cases there)
> 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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