Github user shaoxuan-wang commented on a diff in the pull request:
https://github.com/apache/flink/pull/3423#discussion_r103673820
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateAggFunction.scala
---
@@ -0,0 +1,101 @@
+/*
+ * 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
+
+import java.util.{ArrayList => JArrayList, List => JList}
+import org.apache.flink.api.common.functions.{AggregateFunction =>
ApiAggFunction}
+import org.apache.flink.table.functions.{Accumulator, AggregateFunction}
+import org.apache.flink.types.Row
+
+/**
+ * Aggregate Function used for the aggregate operator in
+ * [[org.apache.flink.streaming.api.datastream.WindowedStream]]
+ *
+ * @param aggregates the list of all
[[org.apache.flink.table.functions.AggregateFunction]]
+ * used for this aggregation
+ * @param aggFieldsIndex the position (in the input Row) of the input
value for each aggregate
+ * @param aggregateMapping the list of the mapping of (the position of
this aggregate result in the
+ * output row => the index of the aggregate) for
all the aggregates
+ * @param groupKeysIndex the position (in the input Row) of grouping
keys
+ * @param groupKeysMapping the list of mapping of (the position of the
grouping key in the
+ * output row => the index of grouping key) for
all the grouping keys
+ * @param finalRowArity the arity of the final row
+ */
+class AggregateAggFunction(
+ private val aggregates: Array[AggregateFunction[_]],
+ private val aggFieldsIndex: Array[Int],
+ private val aggregateMapping: Array[(Int, Int)],
--- End diff --
Yes, I think a single Array should be good enough, but I am not quite sure
the reason why we have had this initially. I prefer to spend time to
investigate it a little before change it. I think we can make this change at
the codegen step.
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