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https://issues.apache.org/jira/browse/LUCENE-2831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974704#action_12974704
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Yonik Seeley commented on LUCENE-2831:
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Another thing to think about is if this should be unified with the very similar 
ReaderUtil.Slice

> Revise Weight#scorer & Filter#getDocIdSet API to pass Readers context
> ---------------------------------------------------------------------
>
>                 Key: LUCENE-2831
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2831
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: 4.0
>            Reporter: Simon Willnauer
>            Assignee: Simon Willnauer
>             Fix For: 4.0
>
>         Attachments: LUCENE-2831.patch
>
>
> Spinoff from LUCENE-2694 - instead of passing a reader into Weight#scorer(IR, 
> boolean, boolean) we should / could revise the API and pass in a struct that 
> has parent reader, sub reader, ord of that sub. The ord mapping plus the 
> context with its parent would make several issues way easier. See 
> LUCENE-2694, LUCENE-2348 and LUCENE-2829 to name some.

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