Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/12364#discussion_r62167521
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects.scala
---
@@ -688,3 +688,38 @@ case class AssertNotNull(child: Expression,
walkedTypePath: Seq[String])
ev.copy(code = code, isNull = "false", value = childGen.value)
}
}
+
+/**
+ * Returns the value of field at index `index` from the external row
`child`.
+ *
+ * Note that the input row and the field we try to get are both guaranteed
to be not null, if they
+ * are null, a runtime exception will be thrown.
+ */
+case class GetExternalRowField(
+ child: Expression,
+ index: Int,
+ dataType: DataType) extends UnaryExpression with NonSQLExpression {
+
+ override def nullable: Boolean = false
+
+ override def eval(input: InternalRow): Any =
+ throw new UnsupportedOperationException("Only code-generated
evaluation is supported")
--- End diff --
Not related to this PR. We might want to add a `CodegenOnly` trait
extending from `Expression` to avoid duplicating this one.
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