It's not exactly an "or" query. It would be equivalent to an "or" if there were only two terms involved.
Example query:
A B C D E
Matching documents:
A B C D E score = 5 A B D E score = 4 A C D E score = 4 A C E score = 3 A D score = 2
etc.
Well, that's how the things work in Lucene, which provides the underlying scoring. The similarity score for OR queries depends on the number of matching clauses from the query.
We will probably end up implementing such a query for our Q&A project.
By all means it would be a useful addition - I just wanted to point out that the underlying index implementation already supports it the way you wanted.
-- Best regards, Andrzej Bialecki
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