a. Queries are no longer modified during a search. This makes
it possible, e.g., to reuse the same query instance with
multiple indexes from multiple threads.
b. Term-expanding queries (e.g. PrefixQuery, WildcardQuery,
etc.) now work correctly with MultiSearcher, fixing bugs 12619
and 12667.
c. Boosting BooleanQuery's now works, and is supported by the
query parser (problem reported by Lee Mallabone). Thus a query
like "(+foo +bar)^2 +baz" is now supported and equivalent to
"(+foo^2 +bar^2) +baz".
d. New method: Query.rewrite(IndexReader). This permits a
query to re-write itself as an alternate, more primitive query.
Most of the term-expanding query classes (PrefixQuery,
WildcardQuery, etc.) are now implemented using this method.
e. New method: Searchable.explain(Query q, int doc). This
returns an Explanation instance that describes how a particular
document is scored against a query. An explanation can be
displayed as either plain text, with the toString() method, or
as HTML, with the toHtml() method. Note that computing an
explanation is as expensive as executing the query over the
entire index. This is intended to be used in developing
Similarity implementations, and, for good performance, should
not be displayed with every hit.
f. Scorer and Weight are public, not package protected. It now
possible for someone to write a Scorer implementation that is
not in the org.apache.lucene.search package. This is still
fairly advanced programming, and I don't expect anyone to do
this anytime soon, but at least now it is possible.
Caution: These are extensive changes and they have not yet been
tested extensively. Bug reports are appreciated.
git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@149922 13f79535-47bb-0310-9956-ffa450edef68
to having a default.properties define the properties and
allow people to define their own properties easily by creating
a build.properties file.
I also updated the documentation to clearly lay out what one needs
to do to define their own properties.
-jon
git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@149709 13f79535-47bb-0310-9956-ffa450edef68
Erik Hatcher
Doug Cutting
Otis Gospodnetic
Peter Carlson
Jon Scott Stevens