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https://issues.apache.org/jira/browse/SOLR-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430019#comment-16430019
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Erick Erickson commented on SOLR-3740:
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Can this be closed? There's been a lot of changes since this was opened.
> ExtendedDismaxQParser (edismax) does not obey q.op for parenthesized
> sub-queries
> --------------------------------------------------------------------------------
>
> Key: SOLR-3740
> URL: https://issues.apache.org/jira/browse/SOLR-3740
> Project: Solr
> Issue Type: Bug
> Components: query parsers
> Affects Versions: 3.6.1, 4.0-BETA
> Reporter: Jack Krupansky
> Priority: Major
>
> For a query such as "cat dog (fox bat fish)" with &q.op=AND, the default
> query operator is only set to AND for the top-level query, and not for the
> parenthesize sub-query. This is not documented behavior and rather surprising.
> This happens because edismax only simulates the default operator by forcing
> "mm" (minMatch) to 100% for the top-level BooleanQuery alone and never sets
> the default query operator when it invokes the classic Lucene Query parser
> which in turn is performing parsing and query generation for the
> parenthesized sub-query.
> One solution is for edismax to always set the default query operator when
> calling the classic Lucene query parser, or at least when q.op=AND.
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