Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21122#discussion_r185967201
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala
---
@@ -31,10 +30,16 @@ import org.apache.spark.util.ListenerBus
*
* Implementations should throw [[NoSuchDatabaseException]] when databases
don't exist.
*/
-abstract class ExternalCatalog
- extends ListenerBus[ExternalCatalogEventListener, ExternalCatalogEvent] {
+trait ExternalCatalog {
import CatalogTypes.TablePartitionSpec
+ // Returns the underlying catalog class (e.g., HiveExternalCatalog).
+ def unwrapped: ExternalCatalog = this
--- End diff --
Sure, let us get rid of it from this interface. We can do it in
ExternalCatalogWithListener.scala
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