Processors for Columns to extract and populate data in data store column...

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Sorry didn't get that. Can you please ellaborate on what you mean by that?

DataType is an enum that defines the Type of field. ValueClass defines the exact class. So for example if DataType is ENUM valueClass can be Airport or Airline. So clearly we need a ValueClass in addition to DataType.

Are you suggesting we just use ValueClass? i.e. Field has no data type, just a class? How would FieldValues and any place that does conversions work in such a scenario?