Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/2405#discussion_r17583846
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypes.scala
---
@@ -68,36 +72,96 @@ case class GetItem(child: Expression, ordinal:
Expression) extends Expression {
}
}
}
+
+ def containsNullList = child match {
+ case n: NestedArrayRecorder if n.isValid => n.containsNullList.drop(1)
+ case _ => Nil
+ }
+
+ def innerDataType = child match {
+ case n: NestedArrayRecorder if n.isValid => n.innerDataType
+ case _ => dataType
+ }
}
/**
- * Returns the value of fields in the Struct `child`.
+ * Returns the value of fields in the `child`.
+ * The type of `child` can be struct, or array of struct,
+ * or array of array of struct, or array of array ... of struct.
*/
-case class GetField(child: Expression, fieldName: String) extends
UnaryExpression {
+case class GetField(child: Expression, fieldName: String) extends
UnaryExpression
+ with NestedArrayRecorder {
+
type EvaluatedType = Any
- def dataType = field.dataType
+ def dataType = buildDataType(containsNullList, field.dataType)
--- End diff --
use `def` or `lazy val`?
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