ConeyLiu commented on code in PR #7898:
URL: https://github.com/apache/iceberg/pull/7898#discussion_r1247609599


##########
spark/v3.4/spark/src/main/java/org/apache/iceberg/spark/SparkV2Filters.java:
##########
@@ -289,11 +311,28 @@ private static Object convertLiteral(Literal<?> literal) {
     return literal.value();
   }
 
-  private static Expression handleEqual(String attribute, Object value) {
-    if (NaNUtil.isNaN(value)) {
-      return isNaN(attribute);
+  private static UnboundPredicate<Object> 
handleEqual(Pair<UnboundTerm<Object>, Object> children) {
+    if (children.second() == null) {
+      return isNull(children.first());
+    }
+
+    if (NaNUtil.isNaN(children.second())) {
+      return isNaN(children.first());
+    } else {
+      return equal(children.first(), children.second());
+    }
+  }
+
+  private static UnboundPredicate<Object> handleNotEqual(
+      Pair<UnboundTerm<Object>, Object> children) {
+    if (children.second() == null) {
+      return notNull(children.first());
+    }
+
+    if (NaNUtil.isNaN(children.second())) {
+      return notNaN(children.first());
     } else {
-      return equal(attribute, value);
+      return notEqual(children.first(), children.second());

Review Comment:
   The string will be wrapped into `NamedReference`. There are two API as 
follows:
   ```java
     public static <T> UnboundPredicate<T> equal(String name, T value) {
       return new UnboundPredicate<>(Expression.Operation.EQ, ref(name), value);
     }
   
     public static <T> UnboundPredicate<T> equal(UnboundTerm<T> expr, T value) {
       return new UnboundPredicate<>(Expression.Operation.EQ, expr, value);
     }
   ```



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