Github user fhueske commented on a diff in the pull request:
    --- Diff: 
    @@ -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(`

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