mgaido91 commented on issue #23285: [SPARK-26224][SQL] Warn and advice the user when creating many project on subsequent calls to withColumn URL: https://github.com/apache/spark/pull/23285#issuecomment-477533316 This seemed to got a bit stale. I think there are 2 approaches possible: - using doc as suggested by @HyukjinKwon ; - emitting a WARN as I think is more effective. Can we find agreement on which of these 2 possible paths follow? Thanks.
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