Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9556#discussion_r44455980
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -108,7 +109,19 @@ trait CheckAnalysis {
case Aggregate(groupingExprs, aggregateExprs, child) =>
def checkValidAggregateExpression(expr: Expression): Unit =
expr match {
- case _: AggregateExpression => // OK
+ case aggExpr: AggregateExpression =>
+ // TODO: Is it possible that the child of a agg function
is another
--- End diff --
seems our error message is not good. I will update this. We should not
users to have nested agg functions like `sum(avg(...))`. I will add an error
message to let users to use sub-queries.
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