You want to look to see how the documents are being analyzed... Look at the Lucy::Analysis set of perl modules (for hints as to how this is handled in c).  You can write your own analyzer to take into special cases for you.  $0.02

Zachary Zebrowski
Forensic Database Engineer / Division Mentoring Liaison
The MITRE Corporation
(W) 202-406-6346
(C) 571-232-5643

-----Original Message-----
Sent: Tuesday, November 28, 2017 12:56 PM
Subject: [lucy-user] C library - Phrase Searches

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,
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