Hi guys again :)

I have a question regarding the phrase searches and their scoring. As I see when we search for a phrase in quotation marks, e.g. "the united states", only messages that contain "the united states" are being returned. (to be more exact messages containing "the unite state" would have returned as well).

My question is how is such queries being handled in the library. Is it by looking at the consecutive term positions in documents? What is the performance impact for such queries?

Secondly how are they being scored? Is it still tf/idf? If so what is the definition of tf and of idf, for these queries?

Thanks as always,