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https://issues.apache.org/jira/browse/LUCENE-1821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744742#action_12744742
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Mark Miller commented on LUCENE-1821:
-------------------------------------

{quote}breaking this out into a per segment cache would then require me to also 
store along with the int[] index array a String[] 
this then gets really slow and nasty when trying to run through the required 
algorithms to use the cache for my application {quote}

Why is this? You must be keying this to the multi reader now right? Why cannot 
you not do the same thing keyed to the sub reader?

> 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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