stevenzwu commented on code in PR #17434:
URL: https://github.com/apache/iceberg/pull/17434#discussion_r3722826371


##########
core/src/test/java/org/apache/iceberg/TestV4ManifestReader.java:
##########
@@ -723,38 +731,170 @@ public void unknownManifestFormatThrows() throws 
IOException {
     InputFile badFile =
         fileIO.newInputFile(tempDir.resolve("manifest-" + System.nanoTime() + 
".txt").toString());
 
-    try (V4ManifestReader reader = V4ManifestReader.builder(badFile, 
UNPARTITIONED_SPECS).build()) {
+    try (V4ManifestReader reader =
+        V4ManifestReader.builder(badFile, UNPARTITIONED_SPECS, 
TABLE_LOCATION).build()) {
       assertThatThrownBy(reader::iterator)
           .isInstanceOf(IllegalArgumentException.class)
           .hasMessageContaining("Cannot determine format of manifest");
     }
   }
 
+  @ParameterizedTest
+  @FieldSource("MANIFEST_FORMATS")
+  public void resolvesRelativeDataFileLocation(FileFormat format) throws 
IOException {
+    TrackedFile file = dataFile("data/00000-0", EMPTY_PARTITION_DATA);

Review Comment:
   nit: maybe add the file format suffix to the file name like 
`format.addExtension("data/00000-0")`.
   
   I remember the read code path infer the file format from the extension.
   ```
   FileFormat format = FileFormat.fromFileName(file.location());
   ``` 



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