Hi,
I was wondering if boosting a grouping of terms has any meaning? For example, (A^2 OR B^3 OR C^1.5)^5.0
If this is the entire query, boosting the entire group really doesn't do anything useful. Every score will be boosted equally by 5.0, so you may as well not even use a boost on the group.
I didn't see it in the query syntax documentation (but the query parser seems to accept it). If it is meaningful, what are the semantics of it? Is the boost factor distributive? That is, is the above query equivalent to (A^10.0 OR B^15.0 OR C^7.5) ?
Yes, its multiplied like you have shown. From BooleanQuery:
if (getBoost() != 1.0f) { // incorporate boost
if (query == c.query) // if rewrite was no-op
query = (Query)query.clone(); // then clone before boost
query.setBoost(getBoost() * query.getBoost());
}
That is part of the rewrite method.
Erik
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