Fokko commented on code in PR #11728:
URL: https://github.com/apache/iceberg/pull/11728#discussion_r1877861454


##########
api/src/main/java/org/apache/iceberg/types/Types.java:
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@@ -412,6 +413,24 @@ public String toString() {
     }
   }
 
+  public static class NullType extends PrimitiveType {

Review Comment:
   @Ppei-Wang this would entail extending the [Iceberg table 
specification](https://iceberg.apache.org/spec/), by adding a new NULL type. 
Hive might have a NullType, but other query engines might not, so we need to 
make sure that it is adopted correctly. For changes to the specification, we 
should have a discussion in the community, it should go through a [Iceberg 
improvement 
proposal](https://iceberg.apache.org/contribute/#apache-iceberg-improvement-proposals).



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