On Mar 26, 2008, at 3:11 AM, Vinci wrote:
While I changing the default schema.xml, I found this attribute where
defined the analyzer...seems it will add some space when multiple
fields
appear in document, but what is its effect appear in query and what
is the
values mean here?
Suppose you add two tokenized "author"s for a document:
author: Billy Bob
author: Thorton Gospodnetic
Without a position gap, the phrase query of "Bob Thorton" would
match! However, with a position increment gap defined you can avoid
that match. The value you set that gap to depends on whether you'll
be using sloppy phrase queries, and how sloppy they'll be and whether
you desire matching across field instances. Under the covers,
remember, that a tokenized field is just a string of terms, even with
multiple field instances.
Erik
