mgaido91 commented on issue #23285: [SPARK-26224][SQL] Avoid creating many project on subsequent calls to withColumn URL: https://github.com/apache/spark/pull/23285#issuecomment-446546121 the test failure shows a potential regression due to this patch I hadn't thought of. Collapsing the projects may avoid the usage of plans which are cached. Unfortunately, this cannot even be checked because the plan can be cached later. @cloud-fan @viirya I don't have any idea how to address this potential regressions. So if you don't have suggestions, I'll close this PR. What do you think? Thanks.
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