wombatu-kun commented on code in PR #16612:
URL: https://github.com/apache/iceberg/pull/16612#discussion_r3369436420


##########
api/src/main/java/org/apache/iceberg/types/Types.java:
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@@ -883,7 +884,14 @@ private NestedField(
     }
 
     private static Literal<?> castDefault(Literal<?> defaultValue, Type type) {
-      if (type.isNestedType() && defaultValue != null) {
+      if (type.isStructType() && defaultValue != null) {

Review Comment:
   castDefault now accepts struct defaults, but the only literal satisfying 
`isEmptyStructDefault` is `StructDefaultLiteral`, which is private to 
`SchemaParser`. The public builder path 
`NestedField.Builder.withInitialDefault(Literal)` (Types.java:827) has no 
factory to construct an empty-struct default, and the `Object` overload routes 
through `Expressions.lit`, which rejects struct values - so struct defaults are 
reachable only via JSON parsing. Consider exposing a public factory so schemas 
can be built programmatically with struct defaults.



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