aihuaxu commented on code in PR #11831:
URL: https://github.com/apache/iceberg/pull/11831#discussion_r1958636578


##########
api/src/main/java/org/apache/iceberg/types/TypeUtil.java:
##########
@@ -712,6 +712,10 @@ public T map(Types.MapType map, Supplier<T> keyResult, 
Supplier<T> valueResult)
       return null;
     }
 
+    public T variant(Types.VariantType variant) {
+      throw new UnsupportedOperationException("Unsupported type: variant");

Review Comment:
   Added the implementations other than PruneColumnsWithoutReordering. For 
FixupTypes for Spark/Flink, there is no fixup for Variant and I didn't add 
coverage for it, unless we just want to test out the exception is not thrown.



##########
api/src/main/java/org/apache/iceberg/types/TypeUtil.java:
##########
@@ -616,8 +616,8 @@ public T map(Types.MapType map, T keyResult, T valueResult) 
{
       return null;
     }
 
-    public T variant() {
-      return null;
+    public T variant(Types.VariantType variant) {
+      throw new UnsupportedOperationException("Unsupported type: variant");

Review Comment:
   Added `CreateMapping` and `DescribeSchemaVisitor` visitor implementation.  I 
will try to address the remaining from different modules separately. 



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