Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19022#discussion_r134684892
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -289,14 +289,15 @@ abstract class UnaryNode extends LogicalPlan {
* expressions with the corresponding alias
*/
protected def getAliasedConstraints(projectList: Seq[NamedExpression]):
Set[Expression] = {
- var allConstraints = child.constraints.asInstanceOf[Set[Expression]]
+ var allConstraints = child.constraints
projectList.foreach {
case a @ Alias(e, _) =>
// For every alias in `projectList`, replace the reference in
constraints by its attribute.
- allConstraints ++= allConstraints.map(_ transform {
+ val replacedElement = allConstraints.map(_ transform {
--- End diff --
By overriding `++`, we don't need to change those.
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