Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/13780#discussion_r67724699
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DatasetCacheSuite.scala ---
@@ -21,11 +21,32 @@ import scala.language.postfixOps
import org.apache.spark.sql.functions._
import org.apache.spark.sql.test.SharedSQLContext
+import org.apache.spark.storage.StorageLevel
class DatasetCacheSuite extends QueryTest with SharedSQLContext {
import testImplicits._
+ test("get storage level") {
+ val ds1 = Seq("1", "2").toDS().as("a")
+ val ds2 = Seq(2, 3).toDS().as("b")
+
+ // default storage level
+ ds1.persist()
+ ds2.cache()
+ assert(ds1.storageLevel() == StorageLevel.MEMORY_AND_DISK)
+ assert(ds2.storageLevel() == StorageLevel.MEMORY_AND_DISK)
+ // unpersist
+ ds1.unpersist()
+ assert(ds1.storageLevel() == StorageLevel.NONE)
+ // non-default storage level
+ ds1.persist(StorageLevel.MEMORY_ONLY_2)
--- End diff --
When writing black-box testing, I might just try all the levels in the test
case, even we can include some customized StorageLevel, which is diffrent from
the defined one.
```scala
Seq(StorageLevel.OFF_HEAP, MEMORY_AND_DISK_SER_2, ...,
StorageLevel.NONE).foreach { level =>
ds1.persist(level)
assert(ds1.storageLevel() == level)
ds1.unpersist()
assert(ds1.storageLevel() == StorageLevel.NONE)
}
```
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