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Date: Tue, 13 Jan 2015 15:16:35 +0000 (UTC)
From: "Adrien Grand (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12767152.1421162179000.71270.1421162195210@Atlassian.JIRA>
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Subject: [jira] [Created] (LUCENE-6179) Remove out-of-order scoring
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Adrien Grand created LUCENE-6179:
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             Summary: Remove out-of-order scoring
                 Key: LUCENE-6179
                 URL: https://issues.apache.org/jira/browse/LUCENE-6179
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Assignee: Adrien Grand
             Fix For: 5.0, Trunk


Out-of-order currently adds complexity that I would like to remove. Here is a selection of issues that come from out-of-order scoring.
 - lots of specializations with collectors: we have two versions of every top score/field collector depending on whether it should support out-of-order collection or not
 - it feels like it should be an implementation detail of our bulk scorers but it also makes our APIs more complicated, eg. LeafCollector.acceptsDocsOutOfOrder
 - if you create a TopFieldCollector, how do you know if you should pass docsScoredInOrder=true or false? To make the decision, you actually need to know whether your query supports out-of-order scoring while the API is on Weight.

I initially wanted to keep it and improve the decision process in LUCENE-6172 but I'm not sure it's the right approach as it would require to make the API even more complicated... hence the suggestion to remove out-of-order scoring completely.


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