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From "Doron Cohen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-730) Restore top level disjunction performance
Date Sat, 26 May 2007 22:40:16 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12499362
] 

Doron Cohen commented on LUCENE-730:
------------------------------------

Two comments: 

With this patch the class BooleanWeight is not
in (direct) use anymore - it is extended by 
BooleanWeight2 and then only the latter is used, 
and creates either Scorer2 or Scorer. We could 
get rid of BolleanWeight2, and have a single 
class BooleanWeight.

Javadocs for useScorer14 methods:
  /**
   * Indicates that 1.4 BooleanScorer should be used.
   * Being static, This setting is system wide.
   * Scoring in 1.4 mode may be faster.
   * But note that unlike the default behavior, it does 
   * not guarantee that docs are collected in docid
   * order. In other words, with this setting, 
   * {@link HitCollector#collect(int,float)} might be
   * invoked first for docid N and only later for docid N-1. 
   */
  public static void setUseScorer14(boolean use14) {

  /**
   * Whether 1.4 BooleanScorer should be used.
   * @see #setUseScorer14(boolean)
   */
  public static boolean getUseScorer14() {


> Restore top level disjunction performance
> -----------------------------------------
>
>                 Key: LUCENE-730
>                 URL: https://issues.apache.org/jira/browse/LUCENE-730
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Paul Elschot
>         Assigned To: Michael Busch
>            Priority: Minor
>             Fix For: 2.2
>
>         Attachments: lucene-730.patch, TopLevelDisjunction20061127.patch
>
>
> This patch restores the performance of top level disjunctions. 
> The introduction of BooleanScorer2 had impacted this as reported
> on java-user on 21 Nov 2006 by Stanislav Jordanov.

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