[GitHub] [iceberg] szehon-ho commented on a diff in pull request #6716: Spark 3.3: Implement Position Deletes Table

["szehon-ho (via GitHub)" <gi...@apache.org>]

szehon-ho commented on code in PR #6716:
URL: https://github.com/apache/iceberg/pull/6716#discussion_r1092774992


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spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/source/PositionDeleteRowReader.java:
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@@ -0,0 +1,116 @@
+/*
+ * 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.spark.source;
+
+import java.util.Map;
+import java.util.stream.Stream;
+import org.apache.iceberg.ContentFile;
+import org.apache.iceberg.ContentScanTask;
+import org.apache.iceberg.MetadataColumns;
+import org.apache.iceberg.Partitioning;
+import org.apache.iceberg.PositionDeletesScanTask;
+import org.apache.iceberg.PositionDeletesTable;
+import org.apache.iceberg.ScanTaskGroup;
+import org.apache.iceberg.Schema;
+import org.apache.iceberg.SerializableTable;
+import org.apache.iceberg.Table;
+import org.apache.iceberg.io.CloseableIterator;
+import org.apache.iceberg.io.InputFile;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.apache.iceberg.types.Types;
+import org.apache.iceberg.util.PartitionUtil;
+import org.apache.spark.rdd.InputFileBlockHolder;
+import org.apache.spark.sql.catalyst.InternalRow;
+import org.apache.spark.sql.connector.read.PartitionReader;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+class PositionDeleteRowReader extends BaseRowReader<PositionDeletesScanTask>
+    implements PartitionReader<InternalRow> {
+  private static final Logger LOG = LoggerFactory.getLogger(PositionDeleteRowReader.class);
+
+  PositionDeleteRowReader(SparkInputPartition partition) {
+    this(
+        partition.table(),
+        partition.taskGroup(),
+        partition.expectedSchema(),
+        partition.isCaseSensitive());
+  }
+
+  PositionDeleteRowReader(
+      Table table,
+      ScanTaskGroup<PositionDeletesScanTask> taskGroup,
+      Schema expectedSchema,
+      boolean caseSensitive) {
+
+    super(table, taskGroup, expectedSchema, caseSensitive);
+
+    int numSplits = taskGroup.tasks().size();
+    LOG.debug("Reading {} position delete file split(s) for table {}", numSplits, table.name());
+  }
+
+  @Override
+  protected Stream<ContentFile<?>> referencedFiles(PositionDeletesScanTask task) {
+    return Stream.of(task.file());
+  }
+
+  @Override
+  protected CloseableIterator<InternalRow> open(PositionDeletesScanTask task) {
+    Table deletesTable = table();
+    Table baseTable;
+    if (deletesTable instanceof SerializableTable.SerializableMetadataTable) {

Review Comment:
   Because RowReader's table is PositionDeletesTable, we need the base table's schema to calculate the partition type here.  There was no easy API to get this.



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