Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/5196#discussion_r27191279
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypes.scala
---
@@ -142,3 +142,29 @@ case class CreateArray(children: Seq[Expression])
extends Expression {
override def toString: String = s"Array(${children.mkString(",")})"
}
+
+/**
+ * Returns a Row containing the evaluation of all children expressions.
+ */
+case class CreateStruct(children: Seq[Expression]) extends Expression {
+ override type EvaluatedType = Row
+
+ override def foldable: Boolean = children.forall(_.foldable)
+
+ override lazy val resolved: Boolean = childrenResolved
+
+ override def dataType: StructType = {
+ assert(resolved, s"CreateStruct is called with unresolved children:
$children.")
--- End diff --
The error message is confusing. `CreateStruct` *can* be called with
unresolved children (and you actually did this [here] [1]), but
`CreateStruct.dataType` can't, because child types may be unknown.
[1]:
https://github.com/apache/spark/pull/5196/files#diff-9c84e1d27f25714e256cb482069359cfR52
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