zhengruifeng commented on code in PR #38917:
URL: https://github.com/apache/spark/pull/38917#discussion_r1040425511


##########
sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala:
##########
@@ -1134,6 +1134,11 @@ class DataFrameSuite extends QueryTest
     checkAnswer(approxSummaryDF, approxSummaryResult)
   }
 
+  test("SPARK-41391: Correct the output column name of 
groupBy.agg(count_distinct)") {
+    val df = person.groupBy("id").agg(count_distinct(col("name")))
+    assert(df.columns === Array("id", "count(DISTINCT name)"))

Review Comment:
   nice, will update



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