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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2831) Revise Weight#scorer & Filter#getDocIdSet API to pass Readers context
Date Wed, 05 Jan 2011 17:54:46 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977878#action_12977878
] 

Simon Willnauer commented on LUCENE-2831:
-----------------------------------------

bq. ReaderContextBuilder.numLeafes uses an AtomicInt, but ReaderUtil.Gather doesn't do any
threading.
that way I can update it in the annonymous class - not do any threading doesn't really matter
that operation is not time critical at all. Impl. detail IMO which is just convenient 

bq. ReaderContext.leaves() is a method - shouldn't it just be a member for consistency? I
don't really understand the javadoc on that method either, since I don't see how I could walk
the tree myself - there are no child pointers.
well they are in CompositeReaderContext but that jdoc is missleading. I added it to prevent
a cast to check if there are leaves I don't see why this is problematic here though. I would
rather add a children() method for consistency here though.

bq. Is ReaderContext.isTopLevel redundant (i.e. it will always be equal to parent==null)?
Maybe the same thing for isAtomic and leaves==null?
yeah we could do that but I would prefer the simple booleans since they are way more expressive
and easier to understand.



> 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
>
>
> 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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