[GitHub] [flink] KurtYoung commented on a change in pull request #8102: [FLINK-12087][table-runtime-blink] Introduce over window operators to blink batch

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KurtYoung commented on a change in pull request #8102: [FLINK-12087][table-runtime-blink] Introduce over window operators to blink batch
URL: https://github.com/apache/flink/pull/8102#discussion_r272005225
 
 

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 File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/runtime/aggregate/over/frame/OverWindowFrame.java
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 @@ -0,0 +1,44 @@
+/*
+ * 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.aggregate.over.frame;
+
+import org.apache.flink.table.dataformat.BaseRow;
+import org.apache.flink.table.dataformat.BinaryRow;
+import org.apache.flink.table.runtime.context.ExecutionContext;
+import org.apache.flink.table.runtime.util.ResettableExternalBuffer;
+
+import java.io.Serializable;
+
+/**
+ * A window frame calculates the results for those records belong to a window frame.
+ * Before use a frame must be prepared by passing it all the records in the current partition.
+ */
+public interface OverWindowFrame extends Serializable {
+
+	void open(ExecutionContext ctx) throws Exception;
+
+	void resetBuffer(ResettableExternalBuffer rows) throws Exception;
 
 Review comment:
   why OverWindowFrame should responsible for resetting the row buffer?

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