cloud-fan commented on issue #23556: [SPARK-26626][SQL] Maximum size for repeatedly substituted aliases in SQL expressions URL: https://github.com/apache/spark/pull/23556#issuecomment-454663203 I'm not sure about this approach. I think there is no problem if we repeat an attribute 1000 times, but it can be a problem if we repeat an expensive expression twice (like UDF). How about we just blacklist UDF in `CollapseProject`?
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