Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17001#discussion_r103865312
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala
 ---
    @@ -30,7 +33,7 @@ import 
org.apache.spark.sql.catalyst.expressions.Expression
      *
      * Implementations should throw [[NoSuchDatabaseException]] when databases 
don't exist.
      */
    -abstract class ExternalCatalog {
    +abstract class ExternalCatalog(conf: SparkConf, hadoopConf: Configuration) 
{
    --- End diff --
    
    but it will be only used in `getDatabase`, and we can save a metastore call 
to get the default database.


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