Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/6261#discussion_r32120057
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
---
@@ -143,11 +143,11 @@ object PartialAggregation {
// We need to pass all grouping expressions though so the grouping
can happen a second
// time. However some of them might be unnamed so we alias them
allowing them to be
// referenced in the second aggregation.
- val namedGroupingExpressions: Map[Expression, NamedExpression] =
+ val namedGroupingExpressions: Seq[(Expression, NamedExpression)] =
--- End diff --
Is this for expressions like `Coalesce` whose children order is sensitive?
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