API, Core: Support column files through TrackedFileAdapter for data files

api/src/main/java/org/apache/iceberg/ColumnFile.java

@@ -0,0 +1,54 @@
+/*
+ * 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 java.util.List;
+import org.apache.iceberg.types.Types;
+
+/** Information about a column file. */
+public interface ColumnFile {
+  Types.NestedField FIELD_IDS =
+      Types.NestedField.required(
+          161,
+          "field_ids",
+          Types.ListType.ofRequired(162, Types.IntegerType.get()),
+          "Field IDs this column file contains");
+  Types.NestedField LOCATION =
+      Types.NestedField.required(
+          163, "location", Types.StringType.get(), "Location of the column file");
+  Types.NestedField FILE_SIZE_IN_BYTES =
+      Types.NestedField.required(
+          164, "file_size_in_bytes", Types.LongType.get(), "Total column file size in bytes");
+
+  static Types.StructType schema() {
+    return Types.StructType.of(FIELD_IDS, LOCATION, FILE_SIZE_IN_BYTES);
+  }
+
+  /** Returns the field IDs contained in this column file. */
+  List<Integer> fieldIds();
+
+  /** Returns the location of the column file. */
+  String location();
+
+  /** Returns the total size of the column file in bytes. */
+  long fileSizeInBytes();
+
+  /** Copies this column file. */
+  ColumnFile copy();
+}

api/src/main/java/org/apache/iceberg/DataFile.java

@@ -164,4 +164,8 @@ default FileContent content() {
   default List<Integer> equalityFieldIds() {
     return null;
   }
+
+  default List<ColumnFile> columnFiles() {
+    return null;
+  }
 }

core/src/main/java/org/apache/iceberg/ColumnFileStruct.java

@@ -0,0 +1,176 @@
+/*
+ * 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 java.io.Serializable;
+import java.util.Arrays;
+import java.util.List;
+import org.apache.iceberg.avro.SupportsIndexProjection;
+import org.apache.iceberg.relocated.com.google.common.base.MoreObjects;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.apache.iceberg.relocated.com.google.common.collect.Sets;
+import org.apache.iceberg.types.Types;
+import org.apache.iceberg.util.ArrayUtil;
+
+/** Mutable {@link StructLike} implementation of {@link ColumnFile}. */
+class ColumnFileStruct extends SupportsIndexProjection implements ColumnFile, Serializable {
+  private static final Types.StructType BASE_TYPE =
+      Types.StructType.of(ColumnFile.FIELD_IDS, ColumnFile.LOCATION, ColumnFile.FILE_SIZE_IN_BYTES);
+
+  private int[] fieldIds = null;
+  private String location = null;
+  private long fileSizeInBytes = -1L;
+
+  /** Used by internal readers to instantiate this class with a projection schema. */
+  ColumnFileStruct(Types.StructType projection) {
+    super(BASE_TYPE, projection);
+  }
+
+  ColumnFileStruct(List<Integer> fieldIds, String location, long fileSizeInBytes) {
+    super(BASE_TYPE.fields().size());
+    this.fieldIds = ArrayUtil.toIntArray(fieldIds);
+    this.location = location;
+    this.fileSizeInBytes = fileSizeInBytes;
+  }
+
+  /** Copy constructor. */
+  private ColumnFileStruct(ColumnFileStruct toCopy) {
+    super(toCopy);
+    this.fieldIds =
+        toCopy.fieldIds != null ? Arrays.copyOf(toCopy.fieldIds, toCopy.fieldIds.length) : null;
+    this.location = toCopy.location;
+    this.fileSizeInBytes = toCopy.fileSizeInBytes;
+  }
+
+  /** Constructor for Java serialization. */
+  ColumnFileStruct() {
+    super(BASE_TYPE.fields().size());
+  }
+
+  @Override
+  public List<Integer> fieldIds() {
+    return fieldIds != null ? ArrayUtil.toUnmodifiableIntList(fieldIds) : null;
+  }
+
+  @Override
+  public String location() {
+    return location;
+  }
+
+  @Override
+  public long fileSizeInBytes() {
+    return fileSizeInBytes;
+  }
+
+  @Override
+  public ColumnFile copy() {
+    return new ColumnFileStruct(this);
+  }
+
+  @Override
+  protected <T> T internalGet(int pos, Class<T> javaClass) {
+    return javaClass.cast(getByPos(pos));
+  }
+
+  private Object getByPos(int pos) {
+    switch (pos) {
+      case 0:
+        return fieldIds();
+      case 1:
+        return location;
+      case 2:
+        return fileSizeInBytes;
+      default:
+        throw new UnsupportedOperationException("Unknown field ordinal: " + pos);
+    }
+  }
+
+  @Override
+  @SuppressWarnings("unchecked")
+  protected <T> void internalSet(int pos, T value) {
+    switch (pos) {
+      case 0:
+        this.fieldIds = ArrayUtil.toIntArray((List<Integer>) value);
+        break;
+      case 1:
+        // always coerce to String for Serializable
+        this.location = value.toString();
+        break;
+      case 2:
+        this.fileSizeInBytes = (long) value;
+        break;
+      default:
+        // ignore the object, it must be from a newer version of the format
+    }
+  }
+
+  static Builder builder() {
+    return new Builder();
+  }
+
+  @Override
+  public String toString() {
+    return MoreObjects.toStringHelper(this)
+        .add("field_ids", fieldIds)
+        .add("location", location)
+        .add("file_size_in_bytes", fileSizeInBytes)
+        .toString();
+  }
+
+  static class Builder {
+    private List<Integer> fieldIds = null;
+    private String location = null;
+    private Long fileSizeInBytes = null;
+
+    Builder fieldIds(List<Integer> newFieldIds) {
+      Preconditions.checkArgument(newFieldIds != null, "Invalid field IDs: null");
+      Preconditions.checkArgument(!newFieldIds.isEmpty(), "Invalid field IDs: empty");
+      Preconditions.checkArgument(
+          Sets.newHashSet(newFieldIds).size() == newFieldIds.size(),
+          "Invalid field IDs: duplicateD IDs found: %s",
+          newFieldIds);
+      this.fieldIds = newFieldIds;
+      return this;
+    }
+
+    Builder location(String newLocation) {
+      Preconditions.checkArgument(newLocation != null, "Invalid location: null");
+      Preconditions.checkArgument(!newLocation.isEmpty(), "Invalid location: empty");
+      this.location = newLocation;
+      return this;
+    }
+
+    Builder fileSizeInBytes(long newFileSizeInBytes) {
+      Preconditions.checkArgument(
+          newFileSizeInBytes >= 0,
+          "Invalid file size in bytes: %s (must be >= 0)",
+          newFileSizeInBytes);
+      this.fileSizeInBytes = newFileSizeInBytes;
+      return this;
+    }
+
+    ColumnFile build() {
+      Preconditions.checkArgument(fieldIds != null, "Missing required value: fieldIds");
+      Preconditions.checkArgument(location != null, "Missing required value: location");
+      Preconditions.checkArgument(
+          fileSizeInBytes != null, "Missing required value: fileSizeInBytes");
+      return new ColumnFileStruct(fieldIds, location, fileSizeInBytes);
+    }
+  }
+}

core/src/main/java/org/apache/iceberg/TrackedFile.java

@@ -94,6 +94,9 @@ interface TrackedFile {
           "equality_ids",
           Types.ListType.ofRequired(136, Types.IntegerType.get()),
           "Field ids used to determine row equality in equality delete files");
+  Types.NestedField COLUMN_FILES =
+      Types.NestedField.optional(
+          158, "column_files", Types.ListType.ofRequired(159, ColumnFile.schema()), "Column files");
 
   static Types.StructType schemaWithContentStats(
       Types.StructType partitionType, Types.StructType contentStatsType) {
@@ -114,7 +117,8 @@ static Types.StructType schemaWithContentStats(
         MANIFEST_INFO,
         KEY_METADATA,
         SPLIT_OFFSETS,
-        EQUALITY_IDS);
+        EQUALITY_IDS,
+        COLUMN_FILES);
   }
 
   /** Returns the tracking information for this entry. */
@@ -165,6 +169,9 @@ static Types.StructType schemaWithContentStats(
   /** Returns the set of field IDs used for equality comparison in equality delete files. */
   List<Integer> equalityIds();
 
+  /** Returns the column files for this file. */
+  List<ColumnFile> columnFiles();
+
   /** Copies this tracked file. */
   TrackedFile copy();
 

core/src/main/java/org/apache/iceberg/TrackedFileAdapters.java

@@ -233,6 +233,11 @@ public DataFile copyWithoutStats() {
     public DataFile copyWithStats(Set<Integer> requestedColumnIds) {
       return new TrackedDataFile(file().copyWithStats(requestedColumnIds), spec());
     }
+
+    @Override
+    public List<ColumnFile> columnFiles() {
+      return file().columnFiles();
+    }
   }
 
   /** Adapts a TrackedFile EQUALITY_DELETES entry to the {@link DeleteFile} interface. */

core/src/main/java/org/apache/iceberg/TrackedFileBuilder.java

@@ -142,7 +142,8 @@ private static TrackedFile terminal(TrackedFile source, Tracking tracking) {
         source.manifestInfo(),
         source.keyMetadata(),
         source.splitOffsets(),
-        source.equalityIds());
+        source.equalityIds(),
+        null);
   }
 
   private TrackedFileBuilder(FileContent contentType, long snapshotId) {
@@ -356,6 +357,7 @@ TrackedFile build() {
         manifestInfo,
         keyMetadata,
         splitOffsets,
-        equalityIds);
+        equalityIds,
+        null);
   }
 }