I have encountered a situation where renaming fields using the Field Rename stage performs so poorly that it is much better to simply use the Expression Evaluator to make copies of the fields (524 in total) with the desired names. This baffles me as I expected the expression evaluator in this scenario to be more costly since it is duplicating the records. What is going on here that is making this so counter intuitive?
Best answer by saleempothiwala
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