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https://issues.apache.org/jira/browse/SOLR-10856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16062195#comment-16062195
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Greg Pendlebury commented on SOLR-10856:
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You are describing exactly what mm is supposed to do. The change made in
SOLR-2649 was the root cause (deliberately... because of the bug caused by the
inverse impact boolean operators had on mm), and SOLR-8812 was about choosing
less disruptive default values when users are not specifying them.
In this case, however you are explicitly requesting mm=100%... and getting
answers that match. The short answer is don't use mm=100% if you want boolean
logic. It is not feature compatible.
The longer answer is nasty and would require delving into how boolean operators
are truly handled by Solr when translated into OCCURS flags. The mm parameter
operates on the SHOULD OCCUR flags, which is (roughly) what your OR terms are
translated into.
> ExtendedDismaxQParser (edismax) override OR when mm=100%
> --------------------------------------------------------
>
> Key: SOLR-10856
> URL: https://issues.apache.org/jira/browse/SOLR-10856
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: query parsers
> Affects Versions: 5.5, 6.0, 6.6
> Reporter: Sébastien LECACHEUR
>
> Since Solr 5.5.1, edismax parser override OR (with AND behavior) in queries
> when mm=100%. This behavior is new from Solr 5.5.1 to 6.6.0.
> Concerned query :
> {code:none}
> curl -s
> 'http://localhost:8983/solr/mycorename/select?q=type_s%3A(A+OR+C)&wt=json&defType=edismax&mm=100%25&indent=true&debugQuery=true'
> {code}
> 1) Solr 5.4.1 :
> {code:javascript}
> "rawquerystring":"type_s:(A OR C)",
> "querystring":"type_s:(A OR C)",
> "parsedquery":"(+(type_s:A type_s:C))/no_coord",
> "parsedquery_toString":"+(type_s:A type_s:C)",
> "explain":{...},
> "QParser":"ExtendedDismaxQParser",
> {code}
> Returns docs as expected.
> 2) Solr 5.5.1 :
> {code:javascript}
> "rawquerystring":"type_s:(A OR C)",
> "querystring":"type_s:(A OR C)",
> "parsedquery":"(+((type_s:A type_s:C)~2))/no_coord",
> "parsedquery_toString":"+((type_s:A type_s:C)~2)",
> "explain":{},
> "QParser":"ExtendedDismaxQParser",
> {code}
> Returns no results
> 3) Solr 6.6.0 :
> {code:javascript}
> "rawquerystring":"type_s:(A OR C)",
> "querystring":"type_s:(A OR C)",
> "parsedquery":"(+(type_s:A type_s:C)~2)/no_coord",
> "parsedquery_toString":"+((type_s:A type_s:C)~2)",
> "explain":{},
> "QParser":"ExtendedDismaxQParser",
> {code}
> Returns no results
> This bug looks like SOLR-8812 issue.
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