vladimirg-db commented on code in PR #50069:
URL: https://github.com/apache/spark/pull/50069#discussion_r1970308036
##########
sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala:
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@@ -2721,6 +2721,39 @@ class DataFrameSuite extends QueryTest
parameters = Map("name" -> ".whatever")
)
}
+
+ test("Nested order by") {
Review Comment:
One more example that we should add:
```
val df1 = spark.sql("SELECT * FROM VALUES (4,5,6), (1,2,3)")
val df2 = df1.select("col1").orderBy("col2")
val df3 = df1.select("col1").orderBy(df1("col2"))
// Cannot order by missing attribute under SubqueryAlias
val df4 = df3.as("q1").orderBy("col3")
val df5 = df3.as("q1").orderBy(df1("col3"))
```
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