JoshRosen 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-492065223 Instead of defining a new `DeterministicLiteralUDF` rule, could we instead ```scala override def foldable: Boolean = deterministic && children.forall(_.foldable) ``` on `ScalaUDF`? That would be a slight generalization of the optimization proposed here.
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