Hi Renjie,

RelTraitDef is the definition or template of RelTrait, while the RelTrait
concept corresponds to the concept of 'physical property' in *The Volcano
Optimizer Generator: Extensibility and Efficient Search*, by G Graefe.

Regards,
Ted Xu

On Wed, Aug 9, 2017 at 5:02 PM Renjie Liu <liurenjie2...@gmail.com> wrote:

> Hi, all:
> I'm reading calcite's source code and confused with these two classes. Why
> these two classes exists and what's their role in query optimizer process?
> --
> Liu, Renjie
> Software Engineer, MVAD
>

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