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From "wangzhenhua (G)" <>
Subject questions about hive CBO
Date Thu, 18 Jun 2015 01:03:04 GMT
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,
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