cloud-fan commented on a change in pull request #27550: [SPARK-30799][SQL] 
"spark_catalog.t" should not be resolved to temp view
URL: https://github.com/apache/spark/pull/27550#discussion_r379371879
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveSessionCatalog.scala
 ##########
 @@ -496,56 +510,94 @@ class ResolveSessionCatalog(
     case ShowTableProperties(r: ResolvedTable, propertyKey) if 
isSessionCatalog(r.catalog) =>
       ShowTablePropertiesCommand(r.identifier.asTableIdentifier, propertyKey)
 
-    case DescribeFunctionStatement(CatalogAndIdentifier(catalog, ident), 
extended) =>
+    case DescribeFunctionStatement(nameParts, extended) =>
       val functionIdent =
-        parseSessionCatalogFunctionIdentifier("DESCRIBE FUNCTION", catalog, 
ident)
+        parseSessionCatalogFunctionIdentifier(nameParts, "DESCRIBE FUNCTION")
       DescribeFunctionCommand(functionIdent, extended)
 
     case ShowFunctionsStatement(userScope, systemScope, pattern, fun) =>
       val (database, function) = fun match {
-        case Some(CatalogAndIdentifier(catalog, ident)) =>
+        case Some(nameParts) =>
           val FunctionIdentifier(fn, db) =
-            parseSessionCatalogFunctionIdentifier("SHOW FUNCTIONS", catalog, 
ident)
+            parseSessionCatalogFunctionIdentifier(nameParts, "SHOW FUNCTIONS")
           (db, Some(fn))
         case None => (None, pattern)
       }
       ShowFunctionsCommand(database, function, userScope, systemScope)
 
-    case DropFunctionStatement(CatalogAndIdentifier(catalog, ident), ifExists, 
isTemp) =>
+    case DropFunctionStatement(nameParts, ifExists, isTemp) =>
       val FunctionIdentifier(function, database) =
-        parseSessionCatalogFunctionIdentifier("DROP FUNCTION", catalog, ident)
+        parseSessionCatalogFunctionIdentifier(nameParts, "DROP FUNCTION")
       DropFunctionCommand(database, function, ifExists, isTemp)
 
-    case CreateFunctionStatement(CatalogAndIdentifier(catalog, ident),
+    case CreateFunctionStatement(nameParts,
       className, resources, isTemp, ignoreIfExists, replace) =>
-      val FunctionIdentifier(function, database) =
-        parseSessionCatalogFunctionIdentifier("CREATE FUNCTION", catalog, 
ident)
-      CreateFunctionCommand(database, function, className, resources, isTemp, 
ignoreIfExists,
-        replace)
+      if (isTemp) {
+        // temp func doesn't belong to any catalog and we shouldn't resolve 
catalog in the name.
+        val database = if (nameParts.length > 2) {
+          throw new AnalysisException(s"Unsupported function name 
'${nameParts.quoted}'")
 
 Review comment:
   This is consistent with 
https://github.com/apache/spark/pull/27550/files#diff-2e07be4d73605cb1941153441a0c0c14L536

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