dongjoon-hyun commented on a change in pull request #25558:
[SPARK-28855][CORE][ML][SQL][STREAMING] Remove outdated usages of Experimental,
Evolving annotations
URL: https://github.com/apache/spark/pull/25558#discussion_r316828437
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala
##########
@@ -23,7 +23,7 @@ import scala.collection.immutable
import scala.reflect.runtime.universe.TypeTag
import org.apache.spark.{SparkConf, SparkContext}
-import org.apache.spark.annotation._
+import org.apache.spark.annotation.{DeveloperApi, Experimental, Stable,
Unstable}
Review comment:
So, is the only remaining instance `def experimental` which is natural to be
`Experimental`?
```scala
/**
* :: Experimental ::
* A collection of methods that are considered experimental, but can be
used to hook into
* the query planner for advanced functionality.
*
* @group basic
* @since 1.3.0
*/
@Experimental
@transient
@Unstable
def experimental: ExperimentalMethods = sparkSession.experimental
```
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