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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Created: (SOLR-1889) Change default value of 'mm' param to depend on explicit/implicit value of q.op
Date Thu, 22 Apr 2010 19:33:49 GMT
Change default value of 'mm' param to depend on explicit/implicit value of q.op
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                 Key: SOLR-1889
                 URL: https://issues.apache.org/jira/browse/SOLR-1889
             Project: Solr
          Issue Type: Improvement
          Components: search
            Reporter: Hoss Man
             Fix For: 1.5


The 'mm' param for the dismax parser has always defaulted to 100%, but many first time users
seem to expect that the default behavior of dismax should work similar to the standard QParser,
and be influenced by the schema configured default query op, or the q.op query param.

we should change the default value for "mm" to be equivalent to 100% if the derived value
of "q.op" would be AND, and to be 1 if the derived value of "q.op" would be OR.  We should
document this in CHANGES.txt so people who are upgrading know that if they have q.op=OR, but
they still want a default mm value of 100%, they should add it as a configured default for
their request handlers.

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