Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/2529#discussion_r18107395
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Row.scala
---
@@ -181,6 +184,11 @@ class GenericRow(protected[sql] val values:
Array[Any]) extends Row {
values(i).asInstanceOf[String]
}
+ override def getAs[T](i: Int): T = {
+ if (values(i) == null) sys.error("Failed to check null bit for generic
value.")
--- End diff --
Its kinda weird to throw this error for non-primitive types as you can
actually return null here. The check is only to avoid getting back data that
looks valid but is not. For example:
```scala
scala> def getAs[T] = null.asInstanceOf[T]
getAs: [T]=> T
scala> getAs[Int]
res0: Int = 0
scala> getAs[String]
res1: String = null
```
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