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https://issues.apache.org/jira/browse/SOLR-3145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228361#comment-13228361
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Robert Muir commented on SOLR-3145:
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{quote}
Robert, I don't get your comment - what does this have to do with stopwords or
Similarity? It sounds more like a general opinion that you like OR better than
AND, the more hits the better...
{quote}
Its not a general opinion. I dont care how many 'totalHits' are returned. I
care about the relevance of the top N.
And when good results are discarded simply because the query contained a
useless word like 'his', thats bad news.
People are too quick to jump to AND without debugging the real problem. The
problem is that they see results that don't contain all of their query terms
ranked above results that do: this is a direct result of lucene's sqrt() tf
normalization function (which it tries to make up for with coord): as opposed
to other alternatives that are less aggressive and are known to perform better.
By forcing everything to AND, it then means the ranking system extremely
fragile in cases like stopwords, but this is applying a hammer,
its not the right default.
> 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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