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From "Ramkumar Aiyengar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4586) Increase default maxBooleanClauses
Date Tue, 04 Nov 2014 22:22:34 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14196963#comment-14196963
] 

Ramkumar Aiyengar commented on SOLR-4586:
-----------------------------------------

Since it's been mentioned somewhere above in this issue that maxBooleanClauses mainly serves
the purpose of not tripping users from creating bad queries, wanted to point out that we recently
enountered a case where it was impossible to control this setting.

ComplexPhraseQuery rewrites queries like "foo* bar*" to BQs (because it needs visibility into
the structure of the query), and there's no way to properly set maxClauses without actually
knowing term distribution (to make things worse, per shard in a distributed setup, such a
query could fail in some shards and succeed in others).

> Increase default maxBooleanClauses
> ----------------------------------
>
>                 Key: SOLR-4586
>                 URL: https://issues.apache.org/jira/browse/SOLR-4586
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 4.2
>         Environment: 4.3-SNAPSHOT 1456767M - ncindex - 2013-03-15 13:11:50
>            Reporter: Shawn Heisey
>         Attachments: SOLR-4586.patch, SOLR-4586.patch, SOLR-4586.patch, SOLR-4586.patch,
SOLR-4586.patch, SOLR-4586_verify_maxClauses.patch
>
>
> In the #solr IRC channel, I mentioned the maxBooleanClauses limitation to someone asking
a question about queries.  Mark Miller told me that maxBooleanClauses no longer applies, that
the limitation was removed from Lucene sometime in the 3.x series.  The config still shows
up in the example even in the just-released 4.2.
> Checking through the source code, I found that the config option is parsed and the value
stored in objects, but does not actually seem to be used by anything.  I removed every trace
of it that I could find, and all tests still pass.



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