defaultAndSwitchAsVariable

Author: DQinYuan

src/main/antlr4/QLParser.g4

@@ -455,6 +455,7 @@ varId
     | FUNCTION
     | CASE
     | DEFAULT
+    | SWITCH
     ;
 
 // Switch (unified statement and expression)

src/test/java/com/alibaba/qlexpress4/Express4RunnerTest.java

@@ -1831,4 +1831,12 @@ public void importClsAliasLowercaseAliasTest() {
         // Should throw IllegalArgumentException when alias starts with lowercase
         ImportManager.importClsAlias(ArrayList.class, "myList");
     }
+    
+    @Test
+    public void defaultAndSwitchAsVariable() {
+        Express4Runner express4Runner = new Express4Runner(InitOptions.DEFAULT_OPTIONS);
+        QLResult result = express4Runner
+            .execute("default = 1\nswitch = 2;\ndefault+switch", Collections.emptyMap(), QLOptions.DEFAULT_OPTIONS);
+        assertEquals(3, result.getResult());
+    }
 }