Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9889#discussion_r45824631
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala
---
@@ -213,6 +215,56 @@ class DatasetSuite extends QueryTest with
SharedSQLContext {
}
+ test("persist and unpersist") {
--- End diff --
I'd consider putting these in their own suite. Caching is a pretty
isolated concern. I would also like to see some more tests for operations that
aren't expressed as logical operations (i.e. map/filter with lambda functions
instead of expressions).
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