Grouping Module Change Log For more information on past and future Lucene versions, please see: http://s.apache.org/luceneversions ======================= Trunk (not yet released) ======================= Optimizations LUCENE-3468: Replaced last() and remove() with pollLast() in FirstPassGroupingCollector (Martijn van Groningen) API Changes LUCENE-3483: Move Function grouping collectors from Solr to grouping module. (Martijn van Groningen) New features LUCENE-3496: Support grouping by DocValues. (Martijn van Groningen)