Hello everyone:

Now I am learning calcite streamSQL. Samza is a stream system and uses calcite 
very well. I have a question about planner. Anyone can help me. Thanks in 
advance.

The question is following:

1、  I want to know what is the difference between HepPlanner  and 
VolcanoPlanner? For streamSQL ,which one is better? Samza uses which model?

Thank you very much!

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