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https://issues.apache.org/jira/browse/SOLR-3741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430018#comment-16430018
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Erick Erickson commented on SOLR-3741:
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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 queries with operators
> -----------------------------------------------------------------------------
>
>                 Key: SOLR-3741
>                 URL: https://issues.apache.org/jira/browse/SOLR-3741
>             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 OR (fox bat fish)" with &q.op=AND, the default 
> query operator remains "OR" for the entire 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, but only if 
> there are NO explicit operators present.
> 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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