rdblue commented on code in PR #12581:
URL: https://github.com/apache/iceberg/pull/12581#discussion_r2004256920


##########
parquet/src/main/java/org/apache/iceberg/parquet/ParquetValueWriters.java:
##########
@@ -648,7 +656,7 @@ protected StructWriter(List<ParquetValueWriter<?>> writers) 
{
     @Override
     public void write(int repetitionLevel, S value) {
       for (int i = 0; i < writers.length; i += 1) {
-        Object fieldValue = get(value, i);
+        Object fieldValue = get(value, fieldIndexes[i]);

Review Comment:
   The fix is to map from writer index to field index. The index is created 
below by skipping unknown fields in the data struct.



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