Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13989#discussion_r69090124
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -2307,6 +2307,19 @@ class Dataset[T] private[sql](
def distinct(): Dataset[T] = dropDuplicates()
/**
+ * Refreshes the metadata and data cached in Spark for data associated
with this Dataset.
+ * An example use case is to invalidate the file system metadata cached
by Spark, when the
+ * underlying files have been updated by an external process.
+ *
+ * @group action
+ * @since 2.0.0
+ */
+ def refresh(): Unit = {
+ unpersist(false)
--- End diff --
We can unpersist, but should persist it again immediately.
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