On Oct 3, 2008, at 5:10 AM, sanraj25 wrote:
what is the purpose of positionIncrementGap attribute in
field
type tag of schema.xml. The value specified for that
positionIncrementGap=100. If we change the value what will happen?
Suppose a document has a multi-valued "author" field. Like this:
author: John Doe
author: Bob Smith
With a position increment gap of 0, a phrase query of "doe bob" would
be a match. But often it is undesirable for that kind of match across
different field values. A position increment gap controls the virtual
space between the last token of one field instance and the first token
of the next instance. With a gap of 100, this prevents phrase queries
(even with a modest slop factor) from matching across instances.
Erik
