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Description
Is your feature request related to a problem or challenge? Please describe what you are trying to do.
This may need to be performed upstream (or at least verified) but currently when testing on #892 I discovered that I could convert to/from protobuf for plans that use csv tables, but I cannot do so for those created from a record batch in memory.
Describe the solution you'd like
These tables should be supported for conversion.
Describe alternatives you've considered
None