[GitHub] spark pull request #20429: [SPARK-23157][SQL] Explain restriction on column ...
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[GitHub] spark pull request #20429: [SPARK-23157][SQL] Explain restriction on column ...
GitHub user henryr opened a pull request: https://github.com/apache/spark/pull/20429 [SPARK-23157][SQL] Explain restriction on column expression in withColumn() ## What changes were proposed in this pull request? It's not obvious from the comments that any added column must