[ZEPPELIN-6212] Fix IRInterpreterTest.testZShow() for R 4.0+ compatibility

Author: lee-ji-an

rlang/src/test/java/org/apache/zeppelin/r/IRInterpreterTest.java

@@ -58,7 +58,8 @@ public void testZShow() throws InterpreterException, IOException {
     InterpreterResult result = interpreter.interpret(
             "df=data.frame(country=c(\"US\", \"GB\", \"BR\"),\n" +
             "val1=c(10,13,14),\n" +
-            "val2=c(23,12,32))", context);
+            "val2=c(23,12,32),\n" +
+            "stringsAsFactors = FALSE)", context);
     assertEquals(InterpreterResult.Code.SUCCESS, result.code());
 
     context = getInterpreterContext();
@@ -69,9 +70,9 @@ public void testZShow() throws InterpreterException, IOException {
     assertEquals(InterpreterResult.Type.TABLE, resultMessages.get(0).getType(),
       resultMessages.toString());
     assertEquals("country\tval1\tval2\n" +
-                    "3\t10\t23\n" +
-                    "2\t13\t12\n" +
-                    "1\t14\t32\n",
+                    "US\t10\t23\n" +
+                    "GB\t13\t12\n" +
+                    "BR\t14\t32\n",
             resultMessages.get(0).getData());
 
     context = getInterpreterContext();
@@ -81,7 +82,7 @@ public void testZShow() throws InterpreterException, IOException {
     assertEquals(2, resultMessages.size());
     assertEquals(InterpreterResult.Type.TABLE, resultMessages.get(0).getType(), resultMessages.toString());
     assertEquals("country\tval1\tval2\n" +
-                    "3\t10\t23\n",
+                    "US\t10\t23\n",
             resultMessages.get(0).getData());
     assertEquals(InterpreterResult.Type.HTML, resultMessages.get(1).getType(),
       resultMessages.toString());