Github user huawei-flink commented on a diff in the pull request:
https://github.com/apache/flink/pull/3443#discussion_r103925068
--- Diff:
flink-libraries/flink-table/src/main/java/org/apache/flink/table/plan/nodes/datastream/aggs/DoubleSummaryAggregation.java
---
@@ -0,0 +1,214 @@
+/*
+ * 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.plan.nodes.datastream.aggs;
+
+import static
org.apache.flink.api.java.summarize.aggregation.CompensatedSum.ZERO;
+
+import org.apache.flink.api.java.summarize.aggregation.Aggregator;
+import org.apache.flink.api.java.summarize.aggregation.CompensatedSum;
+import
org.apache.flink.api.java.summarize.aggregation.NumericSummaryAggregator;
+
+public class DoubleSummaryAggregation extends
NumericSummaryAggregator<Double> {
--- End diff --
Indeed, the StreamAggregator interface I defined has a reset and evict
method, to support associative function aggregation. Anyway, no point in
discussing it. I will push my proposal and then you see :-)
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