Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21122#discussion_r184475841
--- 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 {
--- End diff --
Hopefully, the next release.
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