Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4471#discussion_r132227802
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/util/UpdatingPlanChecker.scala
---
@@ -37,8 +37,11 @@ object UpdatingPlanChecker {
/** Extracts the unique keys of the table produced by the plan. */
def getUniqueKeyFields(plan: RelNode): Option[Array[String]] = {
val keyExtractor = new UniqueKeyExtractor
- keyExtractor.go(plan)
- keyExtractor.keys
+ if (!keyExtractor.visit(plan).isDefined) {
--- End diff --
Can be replaced by `keyExtractor.visit(plan).map(_.map(_._1).toArray)`
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