Github user harishreedharan commented on a diff in the pull request:
https://github.com/apache/spark/pull/8881#discussion_r40177949
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/BasicOperationsSuite.scala
---
@@ -210,6 +210,18 @@ class BasicOperationsSuite extends TestSuiteBase {
input.map(_.map(_.toString))
)
}
+
+ test("transform with NULL") {
+ val input = Seq(1 to 4, Seq(), 5 to 8, 9 to 12)
+ testOperation(
+ input,
+ (r: DStream[Int]) => r.transform(rdd => {if (rdd != null &&
!rdd.isEmpty()) rdd.map(_.toString) else null}), // RDD.map in transform
+ input.filter(!_.isEmpty).map(_.map(_.toString)),
+ 4,
+ false
+ )
+ }
--- End diff --
nit: The formatting here is pretty weird. Maybe take the transformation
method out and separate it out as a `def`, so this method call can be in a
single line:
```
def transformMethod(r: DStream[Int]): Option[RDD] = {
r.transform { rdd =>
if (rdd != null && !rdd.isEmpty()) rdd.map(_.toString) else null
}
}
testOperation(input, transformMethod,
input.filter(!_.isEmpty).map(_.map(_.toString)), 4, false)
```
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