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https://issues.apache.org/jira/browse/SOLR-4646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13621092#comment-13621092
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Yonik Seeley commented on SOLR-4646:
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bq. But, in a larger sense, the original goal od edismax was to try to
establish a new and higher bar of usability
Right - lowercase "and" and "or" were meant to be a natural language
improvement (while not being that bad when used as literals instead of
operators). The current behavior is certainly not a bug and Tomas had the
correct doc fix.
> lowercaseOperators is enabled by default for edismax query parser
> -----------------------------------------------------------------
>
> Key: SOLR-4646
> URL: https://issues.apache.org/jira/browse/SOLR-4646
> Project: Solr
> Issue Type: Bug
> Components: query parsers
> Affects Versions: 4.1, 4.2
> Reporter: Alexander Koval
>
> [Documentation|http://wiki.apache.org/solr/ExtendedDisMax#lowercaseOperators]
> says:
> *lowercaseOperators*
> This param controls whether to try to interpret lowercase words as boolean
> operators such as "and", "not" and "or". Set {{&lowercaseOperators=true}} to
> allow this. Default is {{"*false*"}}.
> But in fact {{lowercaseOperators=true}} by default.
> And if one of boolean operators in lowercase is present in query it turns off
> {{mm}} parameter:
> * {{q=Young+6+or+Ariston&defType=edismax&qf=name&mm=100%25&debugQuery=true}}
> {{"parsedquery_toString": "+((name:young) (name:6) (name:ariston))"}}
> *
> {{q=Young+6+or+Ariston&defType=edismax&qf=name&mm=100%25&lowercaseOperators=false&debugQuery=true}}
> {{"parsedquery_toString": "+(((name:young) (name:6) (name:ariston))~3)"}}
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