stevenzwu commented on code in PR #13699:
URL: https://github.com/apache/iceberg/pull/13699#discussion_r2283621660


##########
arrow/src/main/java/org/apache/iceberg/arrow/ArrowSchemaUtil.java:
##########
@@ -51,94 +54,134 @@ private ArrowSchemaUtil() {}
   public static Schema convert(final org.apache.iceberg.Schema schema) {
     ImmutableList.Builder<Field> fields = ImmutableList.builder();
 
-    for (NestedField f : schema.columns()) {
-      fields.add(convert(f));
+    for (NestedField field : schema.columns()) {

Review Comment:
   nit: Why not call `TypeUtil.visit` on the schema directly like other 
visitors? it essentially pushes the for loop inside the visitor, which is 
needed for nested struct anyway.
   
   e.g. Spark `SparkSchemaUtil`
   ```
     public static StructType convert(Schema schema) {
       return (StructType) TypeUtil.visit(schema, new TypeToSparkType());
     }
   ```
   



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