nastra commented on code in PR #11419:
URL: https://github.com/apache/iceberg/pull/11419#discussion_r1839893460


##########
core/src/main/java/org/apache/iceberg/schema/UnionByNameVisitor.java:
##########
@@ -180,6 +180,17 @@ private void updateColumn(Types.NestedField field, 
Types.NestedField existingFie
     }
   }
 
+  private boolean compatibleType(Type newType, Type existingType) {
+    if (existingType.isPrimitiveType()) {
+      // Primitive -> Wider Primitive
+      return newType.isPrimitiveType()
+          && TypeUtil.isPromotionAllowed(newType, 
existingType.asPrimitiveType());

Review Comment:
   shouldn't this be `TypeUtil.isPromotionAllowed(existingType, 
newType.asPrimitiveType())`? The signature of the method is `public static 
boolean isPromotionAllowed(Type from, Type.PrimitiveType to)`



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