One of the little-noticed (yet) features of the upcoming 9.4 release greatly increases the ability to optimize moving aggregates for certain types of numerical

One of the little-noticed (yet) features of the upcoming 9.4 release greatly increases the ability to optimize moving aggregates for certain types of numerical operations, including custom aggregates. See http://www.depesz.com/2014/04/13/waiting-for-9-4-provide-moving-aggregate-support-for-a-bunch-of-aggregates/ http://www.depesz.com/2014/04/13/waiting-for-9-4-provide-mov... for a better explanation.