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https://issues.apache.org/jira/browse/SOLR-3145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228354#comment-13228354
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Robert Muir commented on SOLR-3145:
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I think defaulting to AND is very dangerous: especially with more minimal
stopword lists
like Lucene's. Then shorter documents that happen to be missing some useless
pronoun
don't show up in results at all.
Any problems that this would "Fix" are really problems with Lucene's
Similarity: the term
frequency normalization function grows too fast, etc.
Why not fix the real problem instead: either default to a Similarity with a
stronger coord()
implementation, or a stronger ranking algorithm all together.
> 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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