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https://issues.apache.org/jira/browse/LUCENE-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733760#action_12733760
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Shai Erera commented on LUCENE-1754:
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bq. BooleanQuery could then also do instanceof checks on return from clause
rewrite
That is a good point you raise. Actually today, BQ is quite efficient in that
it compares to null. If we change scorer() to return NMS, we'd need to check
instanceof which is way more expensive (we'd still need to check for null
though, because we cannot enforce NMS).
So I think I'm still in favor of returning null ... or should I say - keep the
currently not documented, but in effect, behavior.
> 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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