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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1557) Make constant-score rewrite the default for multi-term queries
Date Tue, 10 Nov 2009 22:31:28 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12776122#action_12776122
] 

Uwe Schindler commented on LUCENE-1557:
---------------------------------------

It is almost obsolete. Fuzzy is fixed to boolean rewrite. The other queries have no longer
any other modes. Only at some places in contrib are fixed rewrite setting, whcih I simply
remove.

Everywhere else, the defaults are already correct, RangeQuery & Co are gone (deprecated)
and the new ones were already in auto mode. The patch only contains cleanup. We can close
this soon.

I want to get out 3.0.

> Make constant-score rewrite the default for multi-term queries
> --------------------------------------------------------------
>
>                 Key: LUCENE-1557
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1557
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.4.1
>            Reporter: Michael McCandless
>            Assignee: Uwe Schindler
>            Priority: Minor
>             Fix For: 3.0
>
>
> For queries that expand to multiple terms (PrefixQuery, RangeQuery, FuzzyQuery, WildcardQuery),
the default now is to rewrite to a BooleanQuery, which scales poorly, and can hit the dreaded
TooManyClauses (ungraceful degradation).
> Except for FuzzyQuery (which we should fix with this issue), they all support setConstantScoreRewrite,
which scales better.
> In 3.0 we should make constantScoreRewrite the default, and leave an option to turn it
off.
> This is a spinoff from LUCENE-998.

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