pvary commented on code in PR #14245:
URL: https://github.com/apache/iceberg/pull/14245#discussion_r2414431738


##########
flink/v2.1/flink/src/main/java/org/apache/iceberg/flink/source/RowDataToAvroGenericRecordConverter.java:
##########
@@ -41,17 +44,114 @@
 public class RowDataToAvroGenericRecordConverter implements Function<RowData, 
GenericRecord> {
   private final RowDataToAvroConverters.RowDataToAvroConverter converter;
   private final Schema avroSchema;
+  private final RowType rowType;
 
   private RowDataToAvroGenericRecordConverter(RowType rowType, Schema 
avroSchema) {
     this.converter = RowDataToAvroConverters.createConverter(rowType);
     this.avroSchema = avroSchema;
+    this.rowType = rowType;
   }
 
   @Override
   public GenericRecord apply(RowData rowData) {
+    // Check if schema has timestamp-nanos fields
+    if (needsCustomConversion(avroSchema)) {
+      return convertWithNanos(rowData);
+    }
     return (GenericRecord) converter.convert(avroSchema, rowData);
   }
 
+  private boolean needsCustomConversion(Schema schema) {
+    for (Schema.Field field : schema.getFields()) {
+      if (field.schema().getLogicalType() instanceof 
LogicalTypes.TimestampNanos) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  private GenericRecord convertWithNanos(RowData rowData) {
+    GenericRecord result = new GenericData.Record(avroSchema);
+
+    for (int i = 0; i < avroSchema.getFields().size(); i++) {
+      Schema.Field field = avroSchema.getFields().get(i);
+      if (rowData.isNullAt(i)) {
+        result.put(i, null);
+      } else if (field.schema().getLogicalType() instanceof 
LogicalTypes.TimestampNanos) {
+        // Handle timestamp-nanos by converting TimestampData to long nanos
+        // Get precision from the rowType
+        int precision = 6; // default
+        if (rowType.getTypeAt(i).asSummaryString().contains("(9)")) {
+          precision = 9;
+        }
+        TimestampData timestampData = rowData.getTimestamp(i, precision);
+        long nanos =
+            timestampData.getMillisecond() * 1_000_000L + 
timestampData.getNanoOfMillisecond();
+        result.put(i, nanos);
+      } else {
+        // For non-timestamp-nanos fields, copy value directly from rowData
+        result.put(i, getFieldValue(rowData, i, field));
+      }
+    }
+    return result;

Review Comment:
   Add a newline after closing every block?
   See: https://iceberg.apache.org/contribute/#block-spacing



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