Yeaaaah! It's finally done. I am a bit sad, that the new query short circutting is not useable from Solr at the moment.
Uwe ----- Uwe Schindler Achterdiek 19, D-28357 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: jim ferenczi <jim.feren...@gmail.com> > Sent: Thursday, March 14, 2019 1:16 PM > To: general@lucene.apache.org; d...@lucene.apache.org; java- > u...@lucene.apache.org > Subject: [ANNOUNCE] Apache Lucene 8.0.0 released > > 14 March 2019, Apache Lucene™ 8.0.0 available > > The Lucene PMC is pleased to announce the release of Apache Lucene 8.0.0. > > Apache Lucene is a high-performance, full-featured text search engine > library written entirely in Java. It is a technology suitable for nearly > any application that requires full-text search, especially cross-platform. > > This release contains numerous bug fixes, optimizations, and improvements, > some of which are highlighted below. The release is available for immediate > download at: > > http://lucene.apache.org/core/mirrors-core-latest-redir.html > > Lucene 8.0.0 Release Highlights: > > Query execution > Term queries, phrase queries and boolean queries introduced new > optimization that enables efficient skipping over non-competitive documents > when the total hit count is not needed. Depending on the exact query and > data distribution, queries might run between a few percents slower and > many > times faster, especially term queries and pure disjunctions. > In order to support this enhancement, some API changes have been made: > * TopDocs.totalHits is no longer a long but an object that gives a lower > bound of the actual hit count. > * IndexSearcher's search and searchAfter methods now only compute total > hit counts accurately up to 1,000 in order to enable this optimization by > default. > * Queries are now required to produce non-negative scores. > > Codecs > * Postings now index score impacts alongside skip data. This is how term > queries optimize collection of top hits when hit counts are not needed. > * Doc values introduced jump tables, so that advancing runs in constant > time. This is especially helpful on sparse fields. > * The terms index FST is now loaded off-heap for non-primary-key fields > using MMapDirectory, reducing heap usage for such fields. > > Custom scoring > The new FeatureField allows efficient integration of static features such > as a pagerank into the score. Furthermore, the new > LongPoint#newDistanceFeatureQuery and > LatLonPoint#newDistanceFeatureQuery > methods allow boosting by recency and geo-distance respectively. These new > helpers are optimized for the case when total hit counts are not needed. > For instance if the pagerank has a significant weight in your scores, then > Lucene might be able to skip over documents that have a low pagerank > value. > > Further details of changes are available in the change log available at: > http://lucene.apache.org/core/8_0_0/changes/Changes.html > > Please report any feedback to the mailing lists ( > http://lucene.apache.org/core/discussion.html) > > Note: The Apache Software Foundation uses an extensive mirroring network > for distributing releases. It is possible that the mirror you are using may > not have replicated the release yet. If that is the case, please try > another mirror. This also applies to Maven access.
