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Add high level overview to normalization doc. #6445
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I think it would be helpful to explain why the raw table exists since that is something we get questions about a lot.
e.g. (you can word it better) A core tenant of the ELT approach is that the E and L steps mutate the data as little as possible. By getting a copy of the unmodified data into the destination, we reduce the need for resending data in the future, because the "original" data is already in the destination. If you change your mind on how you want to materialize the data, Airbyte can use the untouched raw version that is already in the destination to do it and doesn't need to resend anything.
(of course we do actually resend data in a lot of cases right now, but aspirationally this is what we are going for and why we adhere to this philosophy.
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This absolutely makes sense and I think it's good to explain why it exists. I've included a short explanation on the philosophy.