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https://issues.apache.org/jira/browse/SOLR-3145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228370#comment-13228370
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Jan Høydahl commented on SOLR-3145:
-----------------------------------
Robert, we don't disagree on the fact that search is more difficult than a
simple OR or AND. People need to invest in designing a good search experience,
taking these factors as well as many other into consideration. There is no
silver bullet to recall or relevancy, nor is an advice to use "OR". I have been
involved in more than 100 enterprise search installations world wide and in
perhaps 2 or three of them we chose "OR" as default. Most often it's a matter
of "AND" as default plus a lot of careful design in order to increase recall
without sacrificing too much precision. Another key point is that people expect
AND-ish behavior from the large public search engines, and are puzzled if they
keep getting more results the more words they enter in the search box.
Feel free to open new JIRAs for the other shortcomings you mentioned, like
better Similarity defaults - I'm a big fan of that as well!
> Velocity /browse GUI should stick to AND as defaultOperator
> -----------------------------------------------------------
>
> Key: SOLR-3145
> URL: https://issues.apache.org/jira/browse/SOLR-3145
> Project: Solr
> Issue Type: Improvement
> Components: web gui
> Affects Versions: 4.0
> Reporter: Jan Høydahl
> Assignee: Jan Høydahl
> Fix For: 4.0
>
>
> After SOLR-1889 was committed, the DisMax "mm" parameter defaults to whatever
> set in q.op. Since defaultOperator in schema.xml is OR, this means that
> DisMax now defaults to OR (mm=0) instead of the old default (mm=100%). It
> should stick to AND as before.
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