Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/12364#discussion_r62167413
--- 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`.
--- End diff --
Would be nice to add a more intuitive description:
> This class can be viewed as [[GetStructField]] for [[Row]]s instead of
[[InternalRow]]s.
It took me some time to realize this...
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