SparkQA commented on issue #23285: [SPARK-26224][SQL] Advice the user when creating many project on subsequent calls to withColumn URL: https://github.com/apache/spark/pull/23285#issuecomment-477590077 **[Test build #104048 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/104048/testReport)** for PR 23285 at commit [`5d1fc00`](https://github.com/apache/spark/commit/5d1fc00ad40dec3b811af85c13bd3c01621ba0ed).
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