resolve comments.

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalogSuite.scala

@@ -919,6 +919,34 @@ class SessionCatalogSuite extends SparkFunSuite {
       catalog.lookupFunction(FunctionIdentifier("temp1"), arguments) === Literal(arguments.length))
   }
 
+  test("isTemporaryFunction") {
+    val externalCatalog = newBasicCatalog()
+    val sessionCatalog = new SessionCatalog(externalCatalog)
+
+    // Returns false when the function does not exist
+    assert(!sessionCatalog.isTemporaryFunction(FunctionIdentifier("temp1")))
+
+    val tempFunc1 = (e: Seq[Expression]) => e.head
+    val info1 = new ExpressionInfo("tempFunc1", "temp1")
+    sessionCatalog.createTempFunction("temp1", info1, tempFunc1, ignoreIfExists = false)
+
+    // Returns true when the function is temporary
+    assert(sessionCatalog.isTemporaryFunction(FunctionIdentifier("temp1")))
+
+    // Returns false when the function is permanent
+    assert(externalCatalog.listFunctions("db2", "*").toSet == Set("func1"))
+    assert(!sessionCatalog.isTemporaryFunction(FunctionIdentifier("func1", Some("db2"))))
+    assert(!sessionCatalog.isTemporaryFunction(FunctionIdentifier("db2.func1")))
+    sessionCatalog.setCurrentDatabase("db2")
+    assert(!sessionCatalog.isTemporaryFunction(FunctionIdentifier("func1")))
+
+    // Returns false when the function is built-in or hive
+    assert(FunctionRegistry.builtin.functionExists("sum"))
+    assert(!sessionCatalog.isTemporaryFunction(FunctionIdentifier("sum")))
+    assert(!sessionCatalog.isTemporaryFunction(FunctionIdentifier("histogram_numeric")))
+    assert(!sessionCatalog.isTemporaryFunction(FunctionIdentifier("percentile")))
+  }
+
   test("drop function") {
     val externalCatalog = newBasicCatalog()
     val sessionCatalog = new SessionCatalog(externalCatalog)

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/SQLViewSuite.scala

@@ -488,37 +488,30 @@ class SQLViewSuite extends QueryTest with SQLTestUtils with TestHiveSingleton {
     }
   }
 
-  test("create a permanent/temp view using a hive function") {
-    withView("view1", "tempView1") {
-      sql(s"CREATE VIEW tempView1 AS SELECT histogram_numeric(id, 5) from jt")
-      checkAnswer(sql("select count(*) FROM tempView1"), Row(1))
-      sql(s"CREATE VIEW view1 AS SELECT histogram_numeric(id, 5) from jt")
-      checkAnswer(sql("select count(*) FROM view1"), Row(1))
-    }
-  }
-
-  test("create a permanent/temp view using a built-in function") {
-    withView("view1", "tempView1") {
-      sql(s"CREATE TEMPORARY VIEW tempView1 AS SELECT abs(id) from jt")
-      checkAnswer(sql("select count(*) FROM tempView1"), Row(9))
-      sql(s"CREATE VIEW view1 AS SELECT abs(id) from jt")
-      checkAnswer(sql("select count(*) FROM view1"), Row(9))
-    }
-  }
-
-  test("create a permanent/temp view using a permanent function") {
-    val functionName = "myUpper"
-    val functionClass =
+  test("create a permanent/temp view using a hive, built-in, and permanent user function") {
+    val permanentFuncName = "myUpper"
+    val permanentFuncClass =
       classOf[org.apache.hadoop.hive.ql.udf.generic.GenericUDFUpper].getCanonicalName
-    withUserDefinedFunction(functionName -> false) {
-      sql(s"CREATE FUNCTION $functionName AS '$functionClass'")
-      withView("view1", "tempView1") {
-        withTable("tab1") {
-          (1 to 10).map(i => s"$i").toDF("id").write.saveAsTable("tab1")
-          sql(s"CREATE TEMPORARY VIEW tempView1 AS SELECT $functionName(id) from tab1")
-          checkAnswer(sql("select count(*) FROM tempView1"), Row(10))
-          sql(s"CREATE VIEW view1 AS SELECT $functionName(id) from tab1")
-          checkAnswer(sql("select count(*) FROM view1"), Row(10))
+    val builtInFuncName = "abs"
+    val hiveFuncName = "histogram_numeric"
+
+    withUserDefinedFunction(permanentFuncName -> false) {
+      sql(s"CREATE FUNCTION $permanentFuncName AS '$permanentFuncClass'")
+      withTable("tab1") {
+        (1 to 10).map(i => (s"$i", i)).toDF("str", "id").write.saveAsTable("tab1")
+        Seq("VIEW", "TEMPORARY VIEW").foreach { viewMode =>
+          withView("view1") {
+            sql(
+              s"""
+                 |CREATE $viewMode view1
+                 |AS SELECT
+                 |$permanentFuncName(str),
+                 |$builtInFuncName(id),
+                 |$hiveFuncName(id, 5) over()
+                 |FROM tab1
+               """.stripMargin)
+            checkAnswer(sql("select count(*) FROM view1"), Row(10))
+          }
         }
       }
     }