HepPlanner is a greedy planner & VolcanoPlanner is a more exhaustive planner. ReloptCluster captures env for planning; it holds on to type factory, metadata providerŠ
Having said that these are just required plumbings needed to explore plan alternatives. CalcitePlanner, Meta data providers, ReloptHiveTable are some of the key pieces you need to understand. On 6/17/15, 6:03 PM, "wangzhenhua (G)" <wangzhen...@huawei.com> wrote: >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
