Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/9409#discussion_r44112986
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/utils.scala
---
@@ -54,10 +54,14 @@ object Utils {
mode = aggregate.Complete,
isDistinct = false)
- // We do not support multiple COUNT DISTINCT columns for now.
- case expressions.CountDistinct(children) if children.length == 1 =>
+ case expressions.CountDistinct(children) =>
+ val child = if (children.size > 1) {
+ DropAnyNull(CreateStruct(children))
--- End diff --
We need to check if the no-structs allowed in grouping keys policy will
create a problem for us when we try to use this in a multiple distinct setting.
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