rdblue commented on a change in pull request #23848: [SPARK-26946][SQL] 
Identifiers for multi-catalog
URL: https://github.com/apache/spark/pull/23848#discussion_r266181091
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/identifiers.scala
 ##########
 @@ -105,3 +105,15 @@ case class FunctionIdentifier(funcName: String, database: 
Option[String])
 object FunctionIdentifier {
   def apply(funcName: String): FunctionIdentifier = new 
FunctionIdentifier(funcName)
 }
+
+/**
+ * Catalog identifier.
+
+ * @param space Namespace in the catalog
+ * @param name Object name
+ */
+case class CatalogIdentifier(space: CatalogIdentifier.Namespace, name: String)
 
 Review comment:
   Looks like `Identifier` isn't used. If this is in the v2 namespace, it would 
be fine to simply call the interface `Identifier`.

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