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https://issues.apache.org/jira/browse/SOLR-4646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13621080#comment-13621080
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Jack Krupansky commented on SOLR-4646:
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-1 but... I won't strenuously resist the proposed change.
In some sense, it is a reasonable change - edismax is closer to the traditional
Solr query parser.
But, in a larger sense, the original goal od edismax was to try to establish a
new and higher bar of usability - the idea that you have to use upper case for
keywords is a holdover from the crude old days of search. Sure, we have the
option to disable this "improvement", but somehow the cultural knowledge of the
motivation for that improvement seems to have gotten lost, and now people are
retreating to the barbaric past of primitive search.
Also, the discussion has failed to note that the pf2 and pf3 parameters will
actually include the operator keywords for phrase boosting. For example, a
query for "in and out or not" (no quotes) will do boosting for "in and out",
"and out or", and "out or not", so relevance will be quite decent - even or
Norwegion text!
So, I don't see what significant downside the proposed change would fix, at the
cost of defaulting to a more old-fashioned approach to search.
> 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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