Github user mgaido91 commented on the issue: https://github.com/apache/spark/pull/21537 Thanks everyone for this discussion. I think we all agree that what we need as a first thing is a design doc and we can move the discussion there. @kiszk thank you for your comments. I remember too a document with the proposed API, but I didn't remember if it was a design doc or not and if there was an official agreement on it. Anyway, the document is this one: https://docs.google.com/document/d/1By_V-A2sxCWbP7dZ5EzHIuMSe8K0fQL9lqovGWXnsfs. Probably we can start from it for a proper SPIP? I think the main goal of this is well described there, ie. allowing param replacement for splitting code in wholestage-codegen scenario. Thanks everybody for this discussion.
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