Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10541#discussion_r49040375
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala
---
@@ -49,6 +49,8 @@ abstract class RDG extends LeafExpression with
Nondeterministic {
override def nullable: Boolean = false
override def dataType: DataType = DoubleType
+
+ override def sql: Option[String] =
Some(s"${prettyName.toUpperCase}($seed)")
--- End diff --
it is good to add a doc at here.
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