HyukjinKwon commented on a change in pull request #27499: [SPARK-30590][SQL]
Untyped select API cannot take typed column expression
URL: https://github.com/apache/spark/pull/27499#discussion_r377442595
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File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -1430,6 +1430,11 @@ class Dataset[T] private[sql](
*/
@scala.annotation.varargs
def select(cols: Column*): DataFrame = withPlan {
Review comment:
Hm, but previously `count` case was possible to use it as untyped column.
```scala
scala> spark.range(1).select(count("id"), count("id"), count("id"),
count("id"), count("id"), count("id")).show()
+---------+---------+---------+---------+---------+---------+
|count(id)|count(id)|count(id)|count(id)|count(id)|count(id)|
+---------+---------+---------+---------+---------+---------+
| 1| 1| 1| 1| 1| 1|
+---------+---------+---------+---------+---------+---------+
scala> count("id")
res0: org.apache.spark.sql.TypedColumn[Any,Long] = count(id)
```
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