HyukjinKwon commented on issue #24593: [SPARK-27692][SQL] Add new optimizer rule to evaluate the deterministic scala udf only once if all inputs are literals URL: https://github.com/apache/spark/pull/24593#issuecomment-507695594 The risk stuff or flag is okay. Honestly, I don't like that we need to add a flag for every single optimization. My point is that the approach looks hacky. This has to be done at `ConstantFolding` via `foldable` property.
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