Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21854#discussion_r206711618
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -2124,6 +2124,9 @@ class Analyzer(
override def apply(plan: LogicalPlan): LogicalPlan = plan.transformUp {
case p if p.resolved => p
case p => p transformExpressionsUp {
+ // Produces a placeholder random seed for streaming query, the
real random seed
+ // is given at the beginning of Optimizer.
+ case Uuid(None) if p.isStreaming => Uuid(Some(-1))
--- End diff --
`Uuid` need to have a random seed initialized to make it resolved. This
gives it a fake seed. Since we assign random seeds at optimizer, we can get rid
of it. The intent here is to have a placeholder seed shown in analyzed plan.
Not a big deal, so I'm going to remove it.
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