[jboss-jira] [JBoss JIRA] (DROOLS-5581) Add groupBy feature to executable model DSL

Add groupBy feature to executable model DSL ------------------------------------------- Key: DROOLS-5581 URL: https://issues.redhat.com/browse/DROOLS-5581 Project: Drools Issue Type: Feature Request Reporter: Mario Fusco Assignee: Mario Fusco Priority: Major Optaplanner's CS-D requires that the executable model should provide a construct to build an efficient groupBy implementation. More details are available here [https://docs.google.com/document/d/1IxL2HNMNf_OYxOGGzkVjwXc7NW5ZEear-kz4O...] We already measured that an implementation based on a 3-rules solution as sketched here [https://github.com/triceo/groupby/blob/master/src/main/resources/org/opta...] fulfills the expected performance requirements, so we need # a convenient method in the executable model DSL to define a groupBy # an implementation that internally translates the groupBy defined with 1. into the equivalent of that 3-rules based solution