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Description
Is your feature request related to a problem or challenge? Please describe what you are trying to do.
datafusion-proto has a protobuf definition of logical expressions and associated serde code to translate between the Expr enum and protobuf. I would like it to also support serializing logical plans.
Describe the solution you'd like
Ballista already contains a separate protobuf definition and serde code for logical plans that builds on top of a copy of the datafusion proto file so we should be able to move that to datafusion and then have Ballista use the datafusion-proto API for serializing plans.
Describe alternatives you've considered
None
Additional context
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