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https://issues.apache.org/jira/browse/SOLR-4586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603749#comment-13603749
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Mark Miller commented on SOLR-4586:
-----------------------------------

It's been a long time, but as far as I remember, this isn't supposed to be a 
problem anymore. 

It's still used to limit BQ's in Lucene, but Solr shouldn't be creating those 
large BQ's - I think it's possibly a bug if we are. I think for all normal 
cases we should be using the smart multi term queries that were made to avoid 
this problem?

I'd have to dig to be sure. I also thought I remember shawn saying in irc that 
he confirmed that no code was reading this setting in solr anymore.
                
> Remove maxBooleanClauses from Solr
> ----------------------------------
>
>                 Key: SOLR-4586
>                 URL: https://issues.apache.org/jira/browse/SOLR-4586
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 4.2
>            Reporter: Shawn Heisey
>         Attachments: SOLR-4586.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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