Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/2082#discussion_r16691505
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypes.scala
---
@@ -101,3 +101,44 @@ case class GetField(child: Expression, fieldName:
String) extends UnaryExpressio
override def toString = s"$child.$fieldName"
}
+
+/**
+ * Returns the value of fields[] in the Struct `child`.
--- End diff --
Perhaps: "Returns an array containing the value of `fieldName` for each
element in the input array of type struct".
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