rxin commented on issue #24259: [SPARK-27328][SQL] Add 'deprecated' in ExpressionDescription for extended usage and SQL doc URL: https://github.com/apache/spark/pull/24259#issuecomment-478800287 So the issue with a single flag for all the deprecated functions is that the more functions we deprecate, the more likely one will just turn it on always, and as a result it becomes completely useless. Why do you think it's a lot of overhead to add new flags? Isn't it just a few lines of code? We don't need to define an extra function in the SQLConf object.
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