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https://issues.apache.org/jira/browse/LUCENE-1771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739124#action_12739124
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Michael McCandless commented on LUCENE-1771:
--------------------------------------------

I think we should change the approach here, based on Yonik's last suggestion on 
LUCENE-1749, so that QueryWeight.explain receives *both* the top-level Searcher 
and the sub-reader, with the docID pre-resolved to that sub-reader.  This way 
individual queries are not responsible for resolving to sub-readers.

Actually, since QueryWeight is new in 2.9, we can simply make this change w/o 
deprecation.

> Using explain may double ram reqs for fieldcaches when using 
> ValueSourceQuery/CustomScoreQuery or for ConstantScoreQuerys that use a 
> caching Filter.
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1771
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1771
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 2.9
>
>         Attachments: LUCENE-1771.patch
>
>


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