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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-998) BooleanQuery.setMaxClauseCount(int) is static
Date Wed, 11 Mar 2009 12:19:50 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680858#action_12680858
] 

Michael McCandless commented on LUCENE-998:
-------------------------------------------

bq. we should get a bit better performance with LUCENE-1483 though, because each multi-term
query will rewrite against each segment

Alas, that was my initial thought too, but it's unfortunately false when you are not using
constant-score rewrite mode.

The rewrite happens in Query.weight(Searcher), which we call once, on the top level searcher.
 We then execute the rewritten query per-segment.

I think for a MultiTermQuery that needs to enumerate alot of terms, we are probably looking
at the same problem we saw in LUCENE-1483 with FieldCache (though of course that enumeration
was for all terms).

With constant-score rewrite, we create a filter, and then the filter is only materialized
per-reader.

So, with 2.9, this is another sizable performance benefit/reason to use constant score rewrite.

> BooleanQuery.setMaxClauseCount(int) is static
> ---------------------------------------------
>
>                 Key: LUCENE-998
>                 URL: https://issues.apache.org/jira/browse/LUCENE-998
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: 2.1
>            Reporter: Tim Lebedkov
>         Attachments: lucene-998.patch
>
>
> BooleanQuery.setMaxClauseCount(int) is static. It does not allow searching in multiple
indices from different threads using different settings. This setting should be probably moved
in to the IndexSearcher.

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