viirya 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_r377375821
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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:
For typed column, there is encoder which specifies how we can encode its
output. We have no such info for untyped columns.
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