Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20861#discussion_r204272567
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1994,6 +1996,20 @@ class Analyzer(
}
}
+ /**
+ * Set the seed for random number generation in Uuid expressions.
+ */
+ object ResolvedUuidExpressions extends Rule[LogicalPlan] {
+ private lazy val random = new Random()
+
+ override def apply(plan: LogicalPlan): LogicalPlan = plan.transformUp {
+ case p if p.resolved => p
+ case p => p transformExpressionsUp {
+ case Uuid(None) => Uuid(Some(random.nextLong()))
--- End diff --
One thing I think is, is any use case that we need to re-initialize random
seed for `Rand`? Maybe streaming? For streaming query, I think `Rand` should
use different random seed in each execution. For now, the random seed is
initialized when constructing, even we re-analyze the query, it still uses same
seed.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
