Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/2082#discussion_r16691386 --- 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`. + * for array of structs + */ + +case class GetArrayField(child: Expression, fieldName: String) extends UnaryExpression { + type EvaluatedType = Any + + def dataType = field.dataType + override def nullable = child.nullable || field.nullable + override def foldable = child.foldable + + protected def arrayType = child.dataType match { + case s: ArrayType => s.elementType match { + case t :StructType => t --- End diff -- Always put the `:` next to the variable, not the type.
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