Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/7446#discussion_r34957369
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -234,6 +232,16 @@ object ProjectCollapsing extends Rule[LogicalPlan] {
Project(substitutedProjection, child)
}
}
+
+ private def hasNondeterministic(
+ project: Expression,
+ sourceAliases: AttributeMap[Alias]) = {
+ project.exists {
+ case a: Attribute =>
+
sourceAliases.get(a).map(_.child.exists(!_.deterministic)).getOrElse(false)
--- End diff --
```scala
sourceAliases.get(a).exists(_.child.exists(!_.deterministic))
```
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