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https://issues.apache.org/jira/browse/SOLR-4646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14903047#comment-14903047
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David Smiley commented on SOLR-4646:
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This is an old conversation but I hit this today (from real user queries) and
thought I'd offer my opinion. Allowing lowercase operators, _as it's currently
implemented in edismax_ is trappy. A user might type "foo bar or baz", and
based on how edismax is implemented, "foo" will always be
BooleanClause.Occur.SHOULD ('mm' is ignored, 'q.op' is ignored). I'd feel
better about it if in this mode, the default operator was set to AND.
Nonetheless I think this feature is trappy; users don't necessarily know this
syntax and it's implications.
> 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: Improvement
> Components: query parsers
> Affects Versions: 4.1, 4.2
> Reporter: Alexander Koval
> Priority: Trivial
>
> [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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