Decouple InternalDelete and InternalData file class

Author: ashvina

xtable-api/src/main/java/org/apache/xtable/model/storage/InternalDeletionVector.java

@@ -36,7 +36,7 @@
 @Getter
 @ToString(callSuper = true)
 @EqualsAndHashCode(callSuper = true)
-public class InternalDeletionVector extends InternalDataFile {
+public class InternalDeletionVector extends InternalFile {
   // path (absolute with scheme) of data file to which this deletion vector belongs
   @NonNull String dataFilePath;
 

xtable-core/src/main/java/org/apache/xtable/delta/DeltaConversionSource.java

@@ -40,6 +40,7 @@
 import org.apache.spark.sql.delta.actions.AddFile;
 import org.apache.spark.sql.delta.actions.RemoveFile;
 
+import org.apache.xtable.model.storage.InternalFile;
 import scala.Option;
 
 import io.delta.tables.DeltaTable;
@@ -164,7 +165,7 @@ public TableChange getTableChangeForCommit(Long versionNumber) {
       }
     }
 
-    List<InternalDataFile> allAddedFiles =
+    List<InternalFile> allAddedFiles =
         Stream.concat(addedFiles.values().stream(), deletionVectors.values().stream())
             .collect(Collectors.toList());
     InternalFilesDiff internalFilesDiff =

xtable-core/src/test/java/org/apache/xtable/ValidationTestHelper.java

@@ -31,6 +31,7 @@
 import org.apache.xtable.model.TableChange;
 import org.apache.xtable.model.storage.InternalDataFile;
 import org.apache.xtable.model.storage.InternalDeletionVector;
+import org.apache.xtable.model.storage.InternalFile;
 
 public class ValidationTestHelper {
 
@@ -98,8 +99,7 @@ public static List<String> getAllFilePaths(InternalSnapshot internalSnapshot) {
 
   private static Set<String> extractPathsFromDataFile(Set<InternalDataFile> dataFiles) {
     return dataFiles.stream()
-        .filter(file -> !(file instanceof InternalDeletionVector))
-        .map(InternalDataFile::getPhysicalPath)
+        .map(InternalFile::getPhysicalPath)
         .collect(Collectors.toSet());
   }