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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1754) Get rid of NonMatchingScorer from BooleanScorer2
Date Mon, 20 Jul 2009 18:54:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733315#action_12733315
] 

Michael McCandless commented on LUCENE-1754:
--------------------------------------------

TermWeight.scorer returns null if the termDocs is null (though it looks like DirectoryIndexReader
will never return null termDocs).

PhraseQuery and MultiPhraseQuery return null scorer if they have 0 terms.

A number of scorers check for null returns from their sub-scorers and then return null to
their caller.  IndexSearcher also handles a null scorer.

It looks like null is already in general an accepted/possible return from Weight.scorer().

> Get rid of NonMatchingScorer from BooleanScorer2
> ------------------------------------------------
>
>                 Key: LUCENE-1754
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1754
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Shai Erera
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1754.patch
>
>
> Over in LUCENE-1614 Mike has made a comment about removing NonMatchinScorer from BS2,
and return null in BooleanWeight.scorer(). I've checked and this can be easily done, so I'm
going to post a patch shortly. For reference: https://issues.apache.org/jira/browse/LUCENE-1614?focusedCommentId=12715064&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12715064.
> I've marked the issue as 2.9 just because it's small, and kind of related to all the
search enhancements done for 2.9.

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