stevenzwu commented on code in PR #12298:
URL: https://github.com/apache/iceberg/pull/12298#discussion_r2516706384


##########
spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/source/SparkFileWriterFactory.java:
##########
@@ -340,4 +346,14 @@ SparkFileWriterFactory build() {
           writeProperties);
     }
   }
+
+  private static StructType calculateSparkType(StructType sparkType, Schema 
schema) {
+    if (sparkType != null) {
+      return sparkType;
+    } else if (schema != null) {
+      return SparkSchemaUtil.convert(schema);
+    } else {
+      return null;

Review Comment:
   ok. I remember a previous discussion. for data schema, it should fail. for 
equality delete schema, it can be null. I am favoring two separate helper 
methods so that it does strict check for data schema.



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