Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9364#discussion_r43452473
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -987,4 +992,116 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
val df = (1 to 10).map(Tuple1.apply).toDF("i").as("src")
assert(df.select($"src.i".cast(StringType)).columns.head === "i")
}
+
+ /**
+ * Verifies that there is no Exchange between the Aggregations for `df`
+ */
+ private def verifyNonExchangingAgg(df: DataFrame) = {
+ var atFirstAgg: Boolean = false
+ df.queryExecution.executedPlan.foreach {
+ case agg: TungstenAggregate => {
+ atFirstAgg = !atFirstAgg
+ }
+ case _ => {
+ if (atFirstAgg) {
+ fail("Should not have operators between the two aggregations")
+ }
+ }
+ }
--- End diff --
Maybe we can do
```
val numExchanges = df.queryExecution.executedPlan.collect {
case e: Exchange => e
}.size
```
Then, we can check if `numExchanges` is `0`.
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