Hi all, I'm reading the source code of Hive cbo (CalcaitePlanner), but I find it hard to follow. Listed below are some of the questions: 1. What's the relationship between HepPlanner and HiveVolcanoPlanner? 2. I don't have a clue about these concepts: clusters, traitDef and collectGarbage().
Thanks for any help. ________________________________ best regards, -zhenhua
