Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/9409#discussion_r44214255
--- 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 --
Quick follow-up.
Allowing structs does not seem to create a problem. I disabled this line
locally:
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Utils.scala#L36.
And now it uses the TungstenAggregate.
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