Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21594#discussion_r197247440
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -2971,7 +2971,7 @@ class Dataset[T] private[sql](
* @since 1.6.0
*/
def unpersist(blocking: Boolean): this.type = {
- sparkSession.sharedState.cacheManager.uncacheQuery(this, blocking)
+ sparkSession.sharedState.cacheManager.uncacheQuery(this, false,
blocking)
--- End diff --
nit: it's clearer to write `cascade =false`
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