sundapeng commented on code in PR #10303:
URL: https://github.com/apache/paimon/pull/10303#discussion_r4191526100


##########
paimon-core/src/main/java/org/apache/paimon/table/format/FormatDataSplit.java:
##########
@@ -40,16 +40,26 @@ public class FormatDataSplit implements Split {
     private final List<FileMeta> files;
     @Nullable private final BinaryRow partition;
     private final boolean useCatalogContextFileIO;
+    @Nullable private final String fileFormat;
 
     public FormatDataSplit(List<FileMeta> files, @Nullable BinaryRow 
partition) {
         this(files, partition, false);
     }
 
     public FormatDataSplit(
             List<FileMeta> files, @Nullable BinaryRow partition, boolean 
useCatalogContextFileIO) {
+        this(files, partition, useCatalogContextFileIO, null);

Review Comment:
   FormatDataSplit is not @Public, and in this repo only tests use the 3-arg 
constructor. I'd prefer to remove it. A caller that rebuilds a split with it 
silently gets a null `fileFormat`, so it is easy to misuse. Tests can call the 
4-arg one with `null`.



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