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From Karapost <>
Subject Manage the distribution of the data
Date Tue, 09 Oct 2018 10:08:42 GMT

I am working on a project which involves distributed servers that 
contain chunks of the data. At the moment, I'm connecting to each of 
these nodes through calcite (jdbc adapters) and integrating everything 
with a view in the schema. I use calcite to come up with a optimized plan.
I would like to enforce some kind of constraints on the movement of the 
data (e.g. joins involving some attribute are allowed to execute only on 
certain servers) and I though of doing it using traits.

My questions are:

- Should and Can I do this using Conventions and Converters? I though 
about it as coloring the relational tree according to the 
location(=jdbcconvention) where the operation is executed.

- I notice that there are distribution traits and exchange operators, 
are they useful for my case?

- Is it possible to take into account the shipping cost using RelNodes?



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