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https://issues.apache.org/jira/browse/SOLR-4586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629098#comment-13629098
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Jack Krupansky commented on SOLR-4586:
--------------------------------------
And, technically, the query parser's query generator could generate
daisy-chained BooleanQuery's, where every 1024th clause is a reference to a
nested BQ that has than same form. Or, the query parser could generate every
1024 clauses down at a second level and reference them from the main BQ, so
that you could have a single BQ that could have 1024 clauses, each of each is
either a term or BQ, with the second level of BQ being terms only, which would
let you have 1024x1024 or 1M terms.
Not that I am proposing any of this, and I suspect that Lucene will perform
better if it sees all the clauses in one, single group rather than scattered
into multiple BQ's.
> 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
>
>
> 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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