[GitHub] [flink] wuchong commented on a change in pull request #13650: [FLINK-19605][table-runtime-blink] Implement cumulative windowing for window aggregate operator

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wuchong commented on a change in pull request #13650:
URL: https://github.com/apache/flink/pull/13650#discussion_r507885546



##########
File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/runtime/operators/window/assigners/CumulativeWindowAssigner.java
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@@ -0,0 +1,173 @@
+/*
+ * 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.flink.table.runtime.operators.window.assigners;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.table.data.RowData;
+import org.apache.flink.table.runtime.operators.window.TimeWindow;
+import org.apache.flink.util.IterableIterator;
+
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * A {@link WindowAssigner} that windows elements into cumulative windows based on the timestamp of the
+ * elements. Windows are overlap.
+ */
+public class CumulativeWindowAssigner extends PanedWindowAssigner<TimeWindow> implements InternalTimeWindowAssigner {
+
+	private static final long serialVersionUID = 4895551155814656518L;
+
+	private final long size;
+
+	private final long step;
+
+	private final long offset;
+
+	private final long paneSize;
+
+	private final boolean isEventTime;
+
+	protected CumulativeWindowAssigner(long size, long step, long offset, boolean isEventTime) {
+		if (size <= 0 || step <= 0) {
+			throw new IllegalArgumentException(
+				"CumulativeWindowAssigner parameters must satisfy step > 0 and size > 0");
+		}
+		if (size % step != 0) {
+			throw new IllegalArgumentException(
+				"CumulativeWindowAssigner requires size must be an integral multiple of step.");
+		}
+
+		this.size = size;
+		this.step = step;

Review comment:
       Yes. We can support `2 days` max size. 




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