Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21122
To add some more color, the current `ExternalCatalog` is an abstract class
and can already be implemented outside of Spark. However the problem is the
listeners. Everytime we want to listen to one more event, we need to break the
API(`createDatabase` and `doCreateDatabase`). this is very bad for a stable
interface.
The main goal of this PR is to pull out the listener stuff from
`ExternalCatalog`, and make `ExternalCatalog` a pure interface.
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