Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3646#discussion_r109039910
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamGroupAggregate.scala
---
@@ -0,0 +1,117 @@
+/*
+ * 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
+
+import org.apache.calcite.plan.{RelOptCluster, RelTraitSet}
+import org.apache.calcite.rel.`type`.RelDataType
+import org.apache.calcite.rel.core.AggregateCall
+import org.apache.calcite.rel.{RelNode, RelWriter, SingleRel}
+import org.apache.flink.streaming.api.datastream.DataStream
+import org.apache.flink.table.api.StreamTableEnvironment
+import org.apache.flink.table.calcite.FlinkTypeFactory
+import org.apache.flink.table.runtime.aggregate._
+import org.apache.flink.table.plan.nodes.CommonAggregate
+import org.apache.flink.types.Row
+import org.apache.flink.table.runtime.aggregate.AggregateUtil.CalcitePair
+
+/**
+ *
+ * Flink RelNode for data stream group (without window & early-firing)
aggregate
+ *
+ * @param cluster Cluster of the RelNode, represent for an
environment of related
+ * relational expressions during the optimization
of a query.
+ * @param traitSet Trait set of the RelNode
+ * @param inputNode The input RelNode of aggregation
+ * @param namedAggregates List of calls to aggregate functions and their
output field names
+ * @param rowRelDataType The type of the rows of the RelNode
+ * @param inputType The type of the rows of aggregation input
RelNode
+ * @param groupings The position (in the input Row) of the grouping
keys
+ */
+class DataStreamGroupAggregate(
+ cluster: RelOptCluster,
+ traitSet: RelTraitSet,
+ inputNode: RelNode,
+ namedAggregates: Seq[CalcitePair[AggregateCall, String]],
+ rowRelDataType: RelDataType,
+ inputType: RelDataType,
+ groupings: Array[Int])
+ extends SingleRel(cluster, traitSet, inputNode)
+ with CommonAggregate
+ with DataStreamRel {
+
+ override def deriveRowType() = rowRelDataType
+
+ def getGrouping() = groupings
--- End diff --
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