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Charset support proposal


Hi folks,

I created a design doc
https://docs.google.com/document/d/1wo5byn_6K_YOKiPdXNav1zgzt9IBC3SbPvpPnIShtXk/edit?usp=sharing
for supporting charset in calcite, per previous discussions on this topic.

One thing I'm not sure is runtime (Codegen on Enumerable and RelExecutor
etc) change. Since I/O is decoupled by pluggable points like
Schemas#enumerable, that part looks good to me already.

I'm sure there are a lot misunderstandings and missing pieces in that doc
above, please feel free to leave comments.