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

    https://github.com/apache/spark/pull/11189#discussion_r52824448
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala
 ---
    @@ -35,16 +36,15 @@ abstract class Catalog {
       // Databases
       // 
--------------------------------------------------------------------------
     
    -  def createDatabase(dbDefinition: Database, ignoreIfExists: Boolean): Unit
    +  def createDatabase(dbDefinition: CatalogDatabase, ignoreIfExists: 
Boolean): Unit
     
       def dropDatabase(db: String, ignoreIfNotExists: Boolean, cascade: 
Boolean): Unit
     
    -  /**
    -   * Alter an existing database. This operation does not support renaming.
    -   */
    -  def alterDatabase(db: String, dbDefinition: Database): Unit
    +  def alterDatabase(dbDefinition: CatalogDatabase): Unit
    --- End diff --
    
    i'd add some documentation here saying we are picking the database name 
from CatalogDatabase, and will update other db metadata based on CatalogDatabase


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