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https://issues.apache.org/jira/browse/LUCENE-1134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559242#action_12559242
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Paul Elschot commented on LUCENE-1134:
--------------------------------------

A FuzzyQuery rewrites to a BooleanQuery with SHOULD clauses only, so a check 
and cast to BooleanQuery and then a clauses().size() == 0 can check for a No-Op 
after a rewrite().

> BooleanQuery.rewrite does not work properly for minNumberShouldMatch
> --------------------------------------------------------------------
>
>                 Key: LUCENE-1134
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1134
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: 2.4
>            Reporter: Shai Erera
>            Priority: Minor
>         Attachments: LUCENE-1134.patch
>
>
> BooleanQuery.rewrite does not respect minNumberShouldMatch if the number of 
> clauses is 1. This causes inconsistencies for the queries "+def" and "+abc 
> +def", while setting the minNumShouldMatch to '1' for both.
> For the first query, results are returned although there are no SHOULD 
> clauses in the query.
> For the second query no results are returned.
> The reason lies in the optimization BooleanQuery.rewrite has for one clauses 
> queries.
> Patch included - optimize the query for a single clause only if the 
> minNumShouldMatch <= 0.

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