zabetak commented on a change in pull request #2816:
URL: https://github.com/apache/hive/pull/2816#discussion_r758174023



##########
File path: 
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFNullif.java
##########
@@ -86,17 +87,13 @@ public ObjectInspector initialize(ObjectInspector[] 
arguments) throws UDFArgumen
   public Object evaluate(DeferredObject[] arguments) throws HiveException {
     Object arg0 = arguments[0].get();
     Object arg1 = arguments[1].get();
-    Object value0 = null;
-    if (arg0 != null) {
-      value0 = returnOIResolver.convertIfNecessary(arg0, argumentOIs[0], 
false);
-    }
+    Object value0 = returnOIResolver.convertIfNecessary(arg0, argumentOIs[0], 
false);
     if (arg0 == null || arg1 == null) {
       return value0;
     }
-    PrimitiveObjectInspector compareOI = (PrimitiveObjectInspector) 
returnOIResolver.get();
-    if (PrimitiveObjectInspectorUtils.comparePrimitiveObjects(
-        value0, compareOI,
-        returnOIResolver.convertIfNecessary(arg1, argumentOIs[1], false), 
compareOI)) {
+    Object value1 = returnOIResolver.convertIfNecessary(arg1, argumentOIs[1], 
false);
+    ObjectInspector compareOI = returnOIResolver.get();
+    if (ObjectInspectorUtils.compare(value0, compareOI, value1, compareOI) == 
0) {

Review comment:
       Since now we are expanding the support to non-primitives can/should we 
support all other categories: MAP, STRUCT, UNION? 
   I think we should have positive tests for all supported types and negative 
tests (exception) for non-supported ones (if any).




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