Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/17541#discussion_r110090648 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala --- @@ -372,49 +410,19 @@ abstract class QueryPlan[PlanType <: QueryPlan[PlanType]] extends TreeNode[PlanT * enhancements like caching. However, it is not acceptable to return true if the results could * possibly be different. * - * By default this function performs a modified version of equality that is tolerant of cosmetic - * differences like attribute naming and or expression id differences. Operators that - * can do better should override this function. + * This function performs a modified version of equality that is tolerant of cosmetic + * differences like attribute naming and or expression id differences. */ - def sameResult(plan: PlanType): Boolean = { - val left = this.canonicalized - val right = plan.canonicalized - left.getClass == right.getClass && - left.children.size == right.children.size && - left.cleanArgs == right.cleanArgs && - (left.children, right.children).zipped.forall(_ sameResult _) - } + final def sameResult(other: PlanType): Boolean = this.canonicalized == other.canonicalized --- End diff -- To use `==`, we need to overwrite many `equals` and `hashCode` function?
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