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https://issues.apache.org/jira/browse/SOLR-3580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402303#comment-13402303
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Yonik Seeley commented on SOLR-3580:
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This is by design. Treating "and" and "or" as operators when people may not
realize they are is much less catastrophic than treating not as an operator.
If someone searches for
to be or not to be
excluding all documents with "to" in them is very bad.
> In ExtendedDismax, lowercase 'not' operator is not being treated as an
> operator when 'lowercaseOperators' is enabled
> --------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-3580
> URL: https://issues.apache.org/jira/browse/SOLR-3580
> Project: Solr
> Issue Type: Bug
> Components: query parsers
> Affects Versions: 4.0
> Reporter: Michael Dodsworth
> Priority: Minor
> Fix For: 4.0
>
> Attachments: SOLR-3580.patch
>
>
> When lowercase operator support is enabled (for edismax), the lowercase 'not'
> operator is being wrongly treated as a literal term (and not as an operator).
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