Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12871#discussion_r62148788
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/InMemoryCatalog.scala
 ---
    @@ -104,6 +119,14 @@ class InMemoryCatalog extends ExternalCatalog {
             }
           }
           // Remove the database.
    +      val dbDefinition = catalog(db).db
    +      try {
    +        fs.delete(new Path(dbDefinition.locationUri), true)
    --- End diff --
    
    So far, in `HiveExternalCatalog`, I saw this issue. Hive metastore has the 
same behavior. 
    
    Regarding `Purge`, DROP DATABASE does not have such an option.


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