[GitHub] cloud-fan commented on issue #23701: [SPARK-26741][SQL] Allow using aggregate expressions in ORDER BY clause

[GitBox <gi...@apache.org>]

cloud-fan commented on issue #23701: [SPARK-26741][SQL] Allow using aggregate expressions in ORDER BY clause
URL: https://github.com/apache/spark/pull/23701#issuecomment-459235128
 
 
   ```
   val df1 = spark.range(10).groupBy('id).agg(max('id) as 'm)
   val df2 = spark.range(10, 20).groupBy('id).agg(max('id) as 'm)
   val df = df1.unionAll(df2).orderBy(max('id))
   ```
   It seems to me we should fail this query. If we write this query in SQL, `select * from (... union ...) order by max(id)`, does this work in other databases?
   

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