Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9190#discussion_r42700920
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -70,6 +76,13 @@ class Column(protected[sql] val expr: Expression)
extends Logging {
override def hashCode: Int = this.expr.hashCode
/**
+ * Provides a type hint about the expected return value of this column.
This information can
+ * be used by operations such as `select` on a [[Dataset]] to
automatically convert the
+ * results into the correct JVM types.
+ */
+ def as[T : Encoder]: TypedColumn[T] = new TypedColumn[T](expr)
--- End diff --
add since version
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