Core, API, Spec: Metadata Row Lineage

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

@@ -171,4 +171,29 @@ default Iterable<DeleteFile> removedDeleteFiles(FileIO io) {
   default Integer schemaId() {
     return null;
   }
+
+  /**
+   * The row-id of the first newly added row in this snapshot. All rows added in this snapshot will
+   * have a row-id assigned to them greater than this value. All rows with a row-id less than this
+   * value were created in a snapshot that was added to the table (but not necessarily commited to
+   * this branch) in the past.
+   *
+   * @return the first row-id to be used in this snapshot or null if row lineage was not enabled
+   *     when the table was created.
+   */
+  default Long firstRowId() {
+    return null;
+  }
+
+  /**
+   * The total number of newly added rows in this snapshot. It should be the summation of {@link
+   * ManifestFile#ADDED_ROWS_COUNT} for every manifest added in this snapshot.
+   *
+   * <p>This field is optional but is required when row lineage is enabled.
+   *
+   * @return the total number of new rows in this snapshot or null if the value was not stored.
+   */
+  default Long addedRows() {
+    return null;
+  }
 }

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

@@ -43,6 +43,8 @@ class BaseSnapshot implements Snapshot {
   private final Map<String, String> summary;
   private final Integer schemaId;
   private final String[] v1ManifestLocations;
+  private final Long firstRowId;
+  private final Long addedRows;
 
   // lazily initialized
   private transient List<ManifestFile> allManifests = null;
@@ -61,7 +63,9 @@ class BaseSnapshot implements Snapshot {
       String operation,
       Map<String, String> summary,
       Integer schemaId,
-      String manifestList) {
+      String manifestList,
+      Long firstRowId,
+      Long addedRows) {
     this.sequenceNumber = sequenceNumber;
     this.snapshotId = snapshotId;
     this.parentId = parentId;
@@ -71,6 +75,8 @@ class BaseSnapshot implements Snapshot {
     this.schemaId = schemaId;
     this.manifestListLocation = manifestList;
     this.v1ManifestLocations = null;
+    this.firstRowId = firstRowId;
+    this.addedRows = addedRows;
   }
 
   BaseSnapshot(
@@ -91,6 +97,8 @@ class BaseSnapshot implements Snapshot {
     this.schemaId = schemaId;
     this.manifestListLocation = null;
     this.v1ManifestLocations = v1ManifestLocations;
+    this.firstRowId = null;
+    this.addedRows = null;
   }
 
   @Override
@@ -128,6 +136,16 @@ public Integer schemaId() {
     return schemaId;
   }
 
+  @Override
+  public Long firstRowId() {
+    return firstRowId;
+  }
+
+  @Override
+  public Long addedRows() {
+    return addedRows;
+  }
+
   private void cacheManifests(FileIO fileIO) {
     if (fileIO == null) {
       throw new IllegalArgumentException("Cannot cache changes: FileIO is null");

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

@@ -517,4 +517,11 @@ public void applyTo(ViewMetadata.Builder viewMetadataBuilder) {
       viewMetadataBuilder.setCurrentVersionId(versionId);
     }
   }
+
+  class EnableRowLineage implements MetadataUpdate {
+    @Override
+    public void applyTo(TableMetadata.Builder metadataBuilder) {
+      metadataBuilder.enableRowLineage();
+    }
+  }
 }

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

@@ -60,6 +60,7 @@ private MetadataUpdateParser() {}
   static final String SET_PARTITION_STATISTICS = "set-partition-statistics";
   static final String REMOVE_PARTITION_STATISTICS = "remove-partition-statistics";
   static final String REMOVE_PARTITION_SPECS = "remove-partition-specs";
+  static final String ENABLE_ROW_LINEAGE = "enable-row-lineage";
 
   // AssignUUID
   private static final String UUID = "uuid";
@@ -154,6 +155,7 @@ private MetadataUpdateParser() {}
           .put(MetadataUpdate.AddViewVersion.class, ADD_VIEW_VERSION)
           .put(MetadataUpdate.SetCurrentViewVersion.class, SET_CURRENT_VIEW_VERSION)
           .put(MetadataUpdate.RemovePartitionSpecs.class, REMOVE_PARTITION_SPECS)
+          .put(MetadataUpdate.EnableRowLineage.class, ENABLE_ROW_LINEAGE)
           .buildOrThrow();
 
   public static String toJson(MetadataUpdate metadataUpdate) {
@@ -249,6 +251,8 @@ public static void toJson(MetadataUpdate metadataUpdate, JsonGenerator generator
       case REMOVE_PARTITION_SPECS:
         writeRemovePartitionSpecs((MetadataUpdate.RemovePartitionSpecs) metadataUpdate, generator);
         break;
+      case ENABLE_ROW_LINEAGE:
+        break;
       default:
         throw new IllegalArgumentException(
             String.format(
@@ -322,6 +326,8 @@ public static MetadataUpdate fromJson(JsonNode jsonNode) {
         return readCurrentViewVersionId(jsonNode);
       case REMOVE_PARTITION_SPECS:
         return readRemovePartitionSpecs(jsonNode);
+      case ENABLE_ROW_LINEAGE:
+        return new MetadataUpdate.EnableRowLineage();
       default:
         throw new UnsupportedOperationException(
             String.format("Cannot convert metadata update action to json: %s", action));

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

@@ -129,7 +129,9 @@ public static TableMetadata replacePaths(
         // TODO: update statistic file paths
         metadata.statisticsFiles(),
         metadata.partitionStatisticsFiles(),
-        metadata.changes());
+        metadata.changes(),
+        metadata.rowLineageEnabled(),
+        metadata.nextRowId());
   }
 
   private static Map<String, String> updateProperties(
@@ -186,7 +188,9 @@ private static List<Snapshot> updatePathInSnapshots(
               snapshot.operation(),
               snapshot.summary(),
               snapshot.schemaId(),
-              newManifestListLocation);
+              newManifestListLocation,
+              snapshot.firstRowId(),
+              snapshot.addedRows());
       newSnapshots.add(newSnapshot);
     }
     return newSnapshots;

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

@@ -51,6 +51,8 @@ private SnapshotParser() {}
   private static final String MANIFESTS = "manifests";
   private static final String MANIFEST_LIST = "manifest-list";
   private static final String SCHEMA_ID = "schema-id";
+  private static final String FIRST_ROW_ID = "first-row-id";
+  private static final String ADDED_ROWS = "added-rows";
 
   static void toJson(Snapshot snapshot, JsonGenerator generator) throws IOException {
     generator.writeStartObject();
@@ -96,6 +98,14 @@ static void toJson(Snapshot snapshot, JsonGenerator generator) throws IOExceptio
       generator.writeNumberField(SCHEMA_ID, snapshot.schemaId());
     }
 
+    if (snapshot.firstRowId() != null) {
+      generator.writeNumberField(FIRST_ROW_ID, snapshot.firstRowId());
+    }
+
+    if (snapshot.addedRows() != null) {
+      generator.writeNumberField(ADDED_ROWS, snapshot.addedRows());
+    }
+
     generator.writeEndObject();
   }
 
@@ -158,6 +168,9 @@ static Snapshot fromJson(JsonNode node) {
 
     Integer schemaId = JsonUtil.getIntOrNull(SCHEMA_ID, node);
 
+    Long firstRowId = JsonUtil.getLongOrNull(FIRST_ROW_ID, node);
+    Long addedRows = JsonUtil.getLongOrNull(ADDED_ROWS, node);
+
     if (node.has(MANIFEST_LIST)) {
       // the manifest list is stored in a manifest list file
       String manifestList = JsonUtil.getString(MANIFEST_LIST, node);
@@ -169,7 +182,9 @@ static Snapshot fromJson(JsonNode node) {
           operation,
           summary,
           schemaId,
-          manifestList);
+          manifestList,
+          firstRowId,
+          addedRows);
 
     } else {
       // fall back to an embedded manifest list. pass in the manifest's InputFile so length can be

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

@@ -41,6 +41,7 @@
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Queue;
 import java.util.Set;
 import java.util.UUID;
@@ -282,6 +283,13 @@ public Snapshot apply() {
       throw new RuntimeIOException(e, "Failed to write manifest list file");
     }
 
+    Long addedRows = null;
+    Long lastRowId = null;
+    if (base.rowLineageEnabled()) {
+      addedRows = calculateAddedRows(manifests);
+      lastRowId = base.nextRowId();
+    }
+
     return new BaseSnapshot(
         sequenceNumber,
         snapshotId(),
@@ -290,7 +298,27 @@ public Snapshot apply() {
         operation(),
         summary(base),
         base.currentSchemaId(),
-        manifestList.location());
+        manifestList.location(),
+        lastRowId,
+        addedRows);
+  }
+
+  private Long calculateAddedRows(List<ManifestFile> manifests) {
+    return manifests.stream()
+        .filter(
+            manifest ->
+                manifest.snapshotId() == null
+                    || Objects.equals(manifest.snapshotId(), this.snapshotId))
+        .mapToLong(
+            manifest -> {
+              Preconditions.checkArgument(
+                  manifest.addedRowsCount() != null,
+                  "Cannot determine number of added rows in snapshot because"
+                      + " the entry for manifest %s is missing the field `added-rows-count`",
+                  manifest.path());
+              return manifest.addedRowsCount();
+            })
+        .sum();
   }
 
   protected abstract Map<String, String> summary();