HyukjinKwon commented on issue #27901: [SPARK-31146][SQL] Leverage the helper method for aliasing in built-in SQL expressions URL: https://github.com/apache/spark/pull/27901#issuecomment-607005047 And I think we don't also guarantee on output columns names (https://github.com/apache/spark/pull/27901#issuecomment-599301603).
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