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https://issues.apache.org/jira/browse/FLINK-3474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179647#comment-15179647
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ASF GitHub Bot commented on FLINK-3474:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1746#discussion_r55010678
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/runtime/aggregate/AggregateReduceGroupFunction.scala
---
@@ -0,0 +1,186 @@
+/*
+ * 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.api.table.runtime.aggregate
+
+import java.lang.Iterable
+
+import com.google.common.base.Preconditions
+import org.apache.flink.api.common.functions.{CombineFunction,
RichGroupReduceFunction, RichMapPartitionFunction}
+import org.apache.flink.api.table.Row
+import org.apache.flink.configuration.Configuration
+import org.apache.flink.util.Collector
+
+import scala.collection.JavaConversions._
+
+/**
+ * It wraps the aggregate logic inside of
+ * [[org.apache.flink.api.java.operators.GroupReduceOperator]].
+ *
+ * @param aggregates The aggregate functions.
+ * @param groupKeysMapping The index mapping of group keys between
intermediate aggregate Row
+ * and output Row.
+ * @param aggregateMapping The index mapping between aggregate function
list and aggregated value
+ * index in output Row.
+ */
+class AggregateReduceGroupFunction(
+ private val aggregates: Array[Aggregate[_ <: Any]],
+ private val groupKeysMapping: Array[(Int, Int)],
+ private val aggregateMapping: Array[(Int, Int)],
+ private val intermediateRowArity: Int)
+ extends RichGroupReduceFunction[Row, Row] {
+
+ private val finalRowLength: Int = groupKeysMapping.length +
aggregateMapping.length
--- End diff --
Can be computed in open and does not need to be a member val.
> Partial aggregate interface design and sort-based implementation
> ----------------------------------------------------------------
>
> Key: FLINK-3474
> URL: https://issues.apache.org/jira/browse/FLINK-3474
> Project: Flink
> Issue Type: Sub-task
> Components: Table API
> Reporter: Chengxiang Li
> Assignee: Chengxiang Li
>
> The scope of this sub task includes:
> # Partial aggregate interface.
> # Simple aggregate function implementation, such as SUM/AVG/COUNT/MIN/MAX.
> # DataSetAggregateRule which translate logical calcite aggregate node to
> Flink user functions. As hash-based combiner is not available yet(see PR
> #1517), we would use sort-based combine as default.
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