Add ability to evaluate expressions into fields #7
Description
e.g. price + cost evaluates to a third column called "price + cost" => Expression(price, "+", cost) evaluates to Field with Field.name = "price + cost"?
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e.g. price + cost evaluates to a third column called "price + cost" => Expression(price, "+", cost) evaluates to Field with Field.name = "price + cost"?