Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/15857#discussion_r87932854 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala --- @@ -428,43 +428,47 @@ object FoldablePropagation extends Rule[LogicalPlan] { } case _ => Nil }) + val replaceFoldable: PartialFunction[Expression, Expression] = { + case a: AttributeReference if foldableMap.contains(a) => foldableMap(a) + } if (foldableMap.isEmpty) { plan } else { var stop = false CleanupAliases(plan.transformUp { - case u: Union => - stop = true - u - case c: Command => - stop = true - c - // For outer join, although its output attributes are derived from its children, they are - // actually different attributes: the output of outer join is not always picked from its - // children, but can also be null. + // Allow all leafnodes --- End diff -- ah i see
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