[GitHub] [iceberg] flyrain commented on a diff in pull request #7388: Spark 3.3: Uniquess validation when computing updates of changelogs

["flyrain (via GitHub)" <gi...@apache.org>]

flyrain commented on code in PR #7388:
URL: https://github.com/apache/iceberg/pull/7388#discussion_r1174074470


##########
spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/CarryoverRemoveIterator.java:
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@@ -0,0 +1,100 @@
+/*
+ * 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;
+
+import java.util.Iterator;
+import org.apache.spark.sql.Row;
+import org.apache.spark.sql.types.StructType;
+
+class CarryoverRemoveIterator extends ChangelogIterator {
+  private final Iterator<Row> rowIterator;
+
+  private Row deletedRow = null;
+  private long deletedRowCount = 0;

Review Comment:
   We can use a stack/list for the same purpose, but this solution has less memory cost.



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