Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18717#discussion_r128923836
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -2739,6 +2752,34 @@ class Dataset[T] private[sql](
}
/**
+ * Returns true when the Dataset is cached and materialized.
+ *
+ * @group basic
+ * @since 2.3.0
+ */
+ def isMaterialized(): Boolean = {
--- End diff --
We already have a few `isCached` APIs, which mean it is cached but it might
not be materialized.
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