Guosmilesmile commented on code in PR #15675:
URL: https://github.com/apache/iceberg/pull/15675#discussion_r2987689105


##########
data/src/test/java/org/apache/iceberg/data/BaseFormatModelTests.java:
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@@ -719,4 +1205,15 @@ private static String splitSizeProperty(FileFormat 
fileFormat) {
               "No split size property defined for format: " + fileFormat);
     };
   }
+
+  private Map<Integer, Object> convertConstantsToEngine(

Review Comment:
   I found the reason why this part is so complicated. It happens on the Flink 
side where `RowDataConverter.convert` used in `convertToEngine` will force the 
STRUCT to be converted to a `Record`. While `SparkUtil.internalToSpark` has 
handled this case. Since `RowDataConverter` is production code, I added 
handling for `PartitionData` in `TestFlinkFormatModel`'s 
`convertConstantToEngine`.



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