ulysses-you commented on a change in pull request #30864:
URL: https://github.com/apache/spark/pull/30864#discussion_r547307289
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala
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@@ -62,9 +64,19 @@ abstract class RDG extends UnaryExpression with
ExpectsInputTypes with Stateful
* Usually the random seed needs to be renewed at each execution under
streaming queries.
*/
trait ExpressionWithRandomSeed {
+ def seedExpression: Expression
def withNewSeed(seed: Long): Expression
}
+/**
+ * A place holder expression used in random functions, will be replaced after
analyze.
+ */
+case class DefaultSeed() extends Expression with Unevaluable {
Review comment:
yes, it's better.
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