beliefer commented on issue #28154: [WIP][SPARK-31372][SQL] Check the validity of built-in function aliases URL: https://github.com/apache/spark/pull/28154#issuecomment-612569828 Because the expression rewrites the SQL function in a variety of ways, there is no way to automatically identify whether the alias of an expression can be displayed correctly in the schema. I will close this PR.
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