Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/6570#discussion_r31491973
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -179,8 +179,17 @@ object ColumnPruning extends Rule[LogicalPlan] {
* expressions into one single expression.
*/
object ProjectCollapsing extends Rule[LogicalPlan] {
+
+ /** Returns true if any expression in projectList is non-deterministic.
*/
+ private def hasNondeterministic(projectList: Seq[NamedExpression]):
Boolean = {
+ projectList.exists(expr => expr.find(!_.deterministic).isDefined)
--- End diff --
This will match rand() + 1. `find` will traverse the expression tree in
pre-order.
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