rdblue commented on code in PR #16100:
URL: https://github.com/apache/iceberg/pull/16100#discussion_r3244682236


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core/src/test/java/org/apache/iceberg/TestTrackedFileAdapters.java:
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@@ -0,0 +1,424 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+import java.util.Map;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
+import org.apache.iceberg.types.Conversions;
+import org.apache.iceberg.types.Types;
+import org.junit.jupiter.api.Test;
+
+class TestTrackedFileAdapters {
+
+  private static final String MANIFEST_LOCATION = 
"s3://bucket/table/manifest.parquet";
+
+  private static final Map<Integer, PartitionSpec> UNPARTITIONED =
+      ImmutableMap.of(0, PartitionSpec.unpartitioned());
+
+  private static Map<Integer, PartitionSpec> specsById(PartitionSpec spec) {
+    return ImmutableMap.of(spec.specId(), spec);
+  }
+
+  @Test
+  void testDataFileAdapterDelegatesAllFields() {
+    TrackingStruct tracking = createTracking(3L);
+    ContentStats stats = createContentStats();
+
+    TrackedFileStruct file =
+        new TrackedFileStruct(
+            tracking,
+            FileContent.DATA,
+            "s3://bucket/data/file.parquet",
+            FileFormat.PARQUET,
+            null,
+            100L,
+            1024L);
+    file.set(6, 0);
+    file.set(8, stats);
+    file.set(9, 3);
+    file.set(12, ByteBuffer.wrap(new byte[] {1, 2, 3}));
+    file.set(13, ImmutableList.of(50L, 100L));
+
+    DataFile dataFile = TrackedFileAdapters.asDataFile(file, UNPARTITIONED);
+
+    assertThat(dataFile.pos()).isEqualTo(3L);
+    assertThat(dataFile.specId()).isEqualTo(0);
+    assertThat(dataFile.content()).isEqualTo(FileContent.DATA);
+    assertThat(dataFile.location()).isEqualTo("s3://bucket/data/file.parquet");
+    assertThat(dataFile.format()).isEqualTo(FileFormat.PARQUET);
+    assertThat(dataFile.recordCount()).isEqualTo(100L);
+    assertThat(dataFile.fileSizeInBytes()).isEqualTo(1024L);
+    assertThat(dataFile.sortOrderId()).isEqualTo(3);
+    assertThat(dataFile.dataSequenceNumber()).isEqualTo(10L);
+    assertThat(dataFile.fileSequenceNumber()).isEqualTo(11L);
+    assertThat(dataFile.firstRowId()).isEqualTo(1000L);
+    assertThat(dataFile.keyMetadata()).isEqualTo(ByteBuffer.wrap(new byte[] 
{1, 2, 3}));
+    assertThat(dataFile.splitOffsets()).containsExactly(50L, 100L);
+    assertThat(dataFile.manifestLocation()).isEqualTo(MANIFEST_LOCATION);
+    assertThat(dataFile.equalityFieldIds()).isNull();
+    assertThat(dataFile.columnSizes()).isNull();
+    assertThat(dataFile.valueCounts()).containsOnly(entry(1, 100L), entry(2, 
200L));
+    assertThat(dataFile.nullValueCounts()).containsOnly(entry(1, 5L), entry(2, 
10L));
+    assertThat(dataFile.nanValueCounts()).containsOnly(entry(2, 3L));
+    assertThat(dataFile.lowerBounds())
+        .containsEntry(1, Conversions.toByteBuffer(Types.IntegerType.get(), 1))
+        .containsEntry(2, Conversions.toByteBuffer(Types.FloatType.get(), 
1.0f));
+    assertThat(dataFile.upperBounds())
+        .containsEntry(1, Conversions.toByteBuffer(Types.IntegerType.get(), 
1000))
+        .containsEntry(2, Conversions.toByteBuffer(Types.FloatType.get(), 
100.0f));
+  }
+
+  @Test
+  void testDataFileAdapterRejectsNonData() {
+    TrackedFileStruct file =
+        new TrackedFileStruct(
+            null,
+            FileContent.EQUALITY_DELETES,
+            "s3://bucket/delete.avro",
+            FileFormat.AVRO,
+            null,
+            50L,
+            512L);
+    file.set(6, 0);
+
+    assertThatThrownBy(() -> TrackedFileAdapters.asDataFile(file, 
UNPARTITIONED))
+        .isInstanceOf(IllegalArgumentException.class)
+        .hasMessage("Invalid content type for DataFile: %s", 
FileContent.EQUALITY_DELETES);
+  }
+
+  @Test
+  void testEqualityDeleteFileAdapterDelegatesAllFields() {
+    TrackingStruct tracking = createTracking(5L);
+    PartitionSpec spec = PartitionSpec.builderFor(new 
Schema()).withSpecId(1).build();
+    ContentStats stats = createContentStats();
+
+    TrackedFileStruct file =
+        new TrackedFileStruct(
+            tracking,
+            FileContent.EQUALITY_DELETES,
+            "s3://bucket/eq-delete.avro",
+            FileFormat.AVRO,
+            null,
+            50L,
+            512L);
+    file.set(6, 1);
+    file.set(8, stats);
+    file.set(9, 5);
+    file.set(12, ByteBuffer.wrap(new byte[] {4, 5}));
+    file.set(13, ImmutableList.of(200L));
+    file.set(14, ImmutableList.of(1, 2, 3));
+
+    DeleteFile deleteFile = TrackedFileAdapters.asEqualityDeleteFile(file, 
specsById(spec));
+
+    assertThat(deleteFile.pos()).isEqualTo(5L);
+    assertThat(deleteFile.specId()).isEqualTo(1);
+    assertThat(deleteFile.content()).isEqualTo(FileContent.EQUALITY_DELETES);
+    assertThat(deleteFile.location()).isEqualTo("s3://bucket/eq-delete.avro");
+    assertThat(deleteFile.format()).isEqualTo(FileFormat.AVRO);
+    assertThat(deleteFile.recordCount()).isEqualTo(50L);
+    assertThat(deleteFile.fileSizeInBytes()).isEqualTo(512L);
+    assertThat(deleteFile.sortOrderId()).isEqualTo(5);
+    assertThat(deleteFile.dataSequenceNumber()).isEqualTo(10L);
+    assertThat(deleteFile.fileSequenceNumber()).isEqualTo(11L);
+    assertThat(deleteFile.firstRowId()).isNull();
+    assertThat(deleteFile.keyMetadata()).isEqualTo(ByteBuffer.wrap(new byte[] 
{4, 5}));
+    assertThat(deleteFile.splitOffsets()).containsExactly(200L);
+    assertThat(deleteFile.manifestLocation()).isEqualTo(MANIFEST_LOCATION);
+    assertThat(deleteFile.equalityFieldIds()).containsExactly(1, 2, 3);
+    assertThat(deleteFile.columnSizes()).isNull();
+    assertThat(deleteFile.valueCounts()).containsOnly(entry(1, 100L), entry(2, 
200L));
+    assertThat(deleteFile.nullValueCounts()).containsOnly(entry(1, 5L), 
entry(2, 10L));
+    assertThat(deleteFile.nanValueCounts()).containsOnly(entry(2, 3L));
+    assertThat(deleteFile.lowerBounds())
+        .containsEntry(1, Conversions.toByteBuffer(Types.IntegerType.get(), 1))
+        .containsEntry(2, Conversions.toByteBuffer(Types.FloatType.get(), 
1.0f));
+    assertThat(deleteFile.upperBounds())
+        .containsEntry(1, Conversions.toByteBuffer(Types.IntegerType.get(), 
1000))
+        .containsEntry(2, Conversions.toByteBuffer(Types.FloatType.get(), 
100.0f));
+  }
+
+  @Test
+  void testEqualityDeleteFileAdapterRejectsNonEqualityDeletes() {
+    TrackedFileStruct file =
+        new TrackedFileStruct(
+            null,
+            FileContent.DATA,
+            "s3://bucket/data.parquet",
+            FileFormat.PARQUET,
+            null,
+            100L,
+            1024L);
+    file.set(6, 0);
+
+    assertThatThrownBy(() -> TrackedFileAdapters.asEqualityDeleteFile(file, 
UNPARTITIONED))
+        .isInstanceOf(IllegalArgumentException.class)
+        .hasMessage("Invalid content type for equality delete file: %s", 
FileContent.DATA);
+  }
+
+  @Test
+  void testDVDeleteFileAdapterDelegatesAllFields() {
+    TrackingStruct tracking = createTracking(7L);
+    PartitionSpec spec = PartitionSpec.builderFor(new 
Schema()).withSpecId(2).build();
+
+    TrackedFileStruct file = createDataFileWithDV(tracking, 2);
+
+    DeleteFile dvFile = TrackedFileAdapters.asDVDeleteFile(file, 
specsById(spec));
+
+    // DV-specific fields from DeletionVector
+    assertThat(dvFile.content()).isEqualTo(FileContent.POSITION_DELETES);
+    assertThat(dvFile.location()).isEqualTo("s3://bucket/puffin/dv-file.bin");
+    assertThat(dvFile.format()).isEqualTo(FileFormat.PUFFIN);
+    assertThat(dvFile.recordCount()).isEqualTo(10L);
+    assertThat(dvFile.fileSizeInBytes()).isEqualTo(256L);
+    
assertThat(dvFile.referencedDataFile()).isEqualTo("s3://bucket/data/file.parquet");
+    assertThat(dvFile.contentOffset()).isEqualTo(128L);
+    assertThat(dvFile.contentSizeInBytes()).isEqualTo(256L);
+
+    // fields delegated from TrackedFile / Tracking
+    assertThat(dvFile.pos()).isEqualTo(7L);
+    assertThat(dvFile.specId()).isEqualTo(2);
+    assertThat(dvFile.dataSequenceNumber()).isEqualTo(10L);
+    assertThat(dvFile.fileSequenceNumber()).isEqualTo(11L);
+    assertThat(dvFile.manifestLocation()).isEqualTo(MANIFEST_LOCATION);
+
+    // fields that should be null for DVs
+    assertThat(dvFile.sortOrderId()).isNull();
+    assertThat(dvFile.firstRowId()).isNull();
+    assertThat(dvFile.keyMetadata()).isNull();
+    assertThat(dvFile.splitOffsets()).isNull();
+    assertThat(dvFile.equalityFieldIds()).isNull();
+    assertThat(dvFile.columnSizes()).isNull();
+    assertThat(dvFile.valueCounts()).isNull();
+    assertThat(dvFile.nullValueCounts()).isNull();
+    assertThat(dvFile.nanValueCounts()).isNull();
+    assertThat(dvFile.lowerBounds()).isNull();
+    assertThat(dvFile.upperBounds()).isNull();
+  }
+
+  @Test
+  void testDVDeleteFileAdapterRejectsNonData() {
+    TrackedFileStruct file =
+        new TrackedFileStruct(
+            null,
+            FileContent.EQUALITY_DELETES,
+            "s3://bucket/eq-delete.avro",
+            FileFormat.AVRO,
+            null,
+            50L,
+            512L);
+    file.set(6, 0);
+    file.set(10, createDeletionVector());
+
+    assertThatThrownBy(() -> TrackedFileAdapters.asDVDeleteFile(file, 
UNPARTITIONED))
+        .isInstanceOf(IllegalArgumentException.class)
+        .hasMessage("Invalid content type for DV delete file: %s", 
FileContent.EQUALITY_DELETES);
+  }
+
+  @Test
+  void testDVDeleteFileAdapterRejectsNullDV() {
+    TrackedFileStruct file =
+        new TrackedFileStruct(
+            null,
+            FileContent.DATA,
+            "s3://bucket/data.parquet",
+            FileFormat.PARQUET,
+            null,
+            100L,
+            1024L);
+    file.set(6, 0);
+
+    assertThatThrownBy(() -> TrackedFileAdapters.asDVDeleteFile(file, 
UNPARTITIONED))
+        .isInstanceOf(IllegalArgumentException.class)
+        .hasMessage("Cannot create DV delete file: no deletion vector");
+  }
+
+  @Test
+  void testNullContentStatsReturnsNullStats() {
+    TrackedFileStruct file =
+        new TrackedFileStruct(
+            null,
+            FileContent.DATA,
+            "s3://bucket/data.parquet",
+            FileFormat.PARQUET,
+            null,
+            100L,
+            1024L);
+    file.set(6, 0);
+
+    DataFile dataFile = TrackedFileAdapters.asDataFile(file, UNPARTITIONED);
+
+    assertThat(dataFile.valueCounts()).isNull();
+    assertThat(dataFile.nullValueCounts()).isNull();
+    assertThat(dataFile.nanValueCounts()).isNull();
+    assertThat(dataFile.lowerBounds()).isNull();
+    assertThat(dataFile.upperBounds()).isNull();
+  }
+
+  @Test
+  void testNullSpecIdResolvesToUnpartitionedSpec() {

Review Comment:
   There is no similar test for tracking? I think we do want to cover the cases 
when tracking is null to validate there are not NPEs.



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