Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15432#discussion_r86658461
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala
---
@@ -97,17 +101,15 @@ case class Rand(seed: Long) extends RDG {
-0.3254147983080288
> SELECT _FUNC_(0);
1.1164209726833079
+ > SELECT _FUNC_(null);
+ 1.1164209726833079
""")
// scalastyle:on line.size.limit
-case class Randn(seed: Long) extends RDG {
- override protected def evalInternal(input: InternalRow): Double =
rng.nextGaussian()
+case class Randn(child: Expression) extends RDG {
- def this() = this(Utils.random.nextLong())
+ def this() = this(Literal(Utils.random.nextLong()))
--- End diff --
The complier seems complaining if we specify the return type in `def this`.
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