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https://issues.apache.org/jira/browse/LUCENE-2831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-2831:
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    Attachment: LUCENE-2831_transition_to_atomicCtx.patch

this patch cuts over Weight#scorer, Weight#explain & Filter#getDocIDSet to 
AtomicReaderContext. I also somewhat fixed IndexSearcher to handle concurrent 
execution correctly with respect to the actual context. Currently each sub 
searcher was its own context now we are just using IS as an executor of one 
leaf but still being aware of the entire context.

All tests pass. I will commit soon if nobody objects

> 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, LUCENE-2831.patch, LUCENE-2831.patch, 
> LUCENE-2831.patch, LUCENE-2831.patch, LUCENE-2831.patch, 
> LUCENE-2831_transition_to_atomicCtx.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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