Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5945#discussion_r29788993
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -638,11 +638,10 @@ class Analyzer(
def addWindow(windowExpressions: Seq[NamedExpression], child:
LogicalPlan): LogicalPlan = {
// First, we group window expressions based on their Window Spec.
val groupedWindowExpression = windowExpressions.groupBy { expr =>
- val windowExpression = expr.find {
- case window: WindowExpression => true
- case other => false
- }.map(_.asInstanceOf[WindowExpression].windowSpec)
- windowExpression.getOrElse(
+ val windowSpec = expr.collect {
--- End diff --
collectFirst
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