Github user shijinkui commented on a diff in the pull request:
https://github.com/apache/flink/pull/3550#discussion_r106605509
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/DataStreamProcTimeAggregateGlobalWindowFunction.scala
---
@@ -0,0 +1,104 @@
+/*
+ * 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
org.apache.flink.streaming.api.functions.windowing.RichAllWindowFunction
+import org.apache.flink.types.Row
+import org.apache.flink.util.Collector
+import org.apache.flink.streaming.api.windowing.windows.Window
+import org.apache.flink.configuration.Configuration
+import org.apache.flink.table.functions.Accumulator
+
+import java.lang.Iterable
+import org.apache.flink.api.java.typeutils.RowTypeInfo
+import org.apache.flink.table.functions.AggregateFunction
+
+
+
+ //org.apache.flink.streaming.api.functions.windowing.AllWindowFunction
+
+class DataStreamProcTimeAggregateGlobalWindowFunction[W <: Window](
+ private val aggregates: Array[AggregateFunction[_]],
+ private val aggFields: Array[Int],
+ private val forwardedFieldCount: Int)
+ extends RichAllWindowFunction[Row, Row, W] {
+
+private var output: Row = _
+private var accumulators: Row= _
+
+
+ override def open(parameters: Configuration): Unit = {
+ output = new Row(forwardedFieldCount + aggregates.length)
+ accumulators = new Row(aggregates.length)
+ var i = 0
+ while (i < aggregates.length) {
+ accumulators.setField(i, aggregates(i).createAccumulator())
+ i = i + 1
+ }
+ }
+
+ override def apply(
+ window: W,
+ records: Iterable[Row],
+ out: Collector[Row]): Unit = {
+
+
+ var i = 0
+ //initialize the values of the aggregators by re-creating them
+ //the design of the Accumulator interface should be extended to
enable
+ //a reset function for better performance
+ while (i < aggregates.length) {
+ accumulators.setField(i, aggregates(i).createAccumulator())
+ i += 1
+ }
+ var reuse:Row = null
+ //iterate through the elements and aggregate
+ val iter = records.iterator
+ while (iter.hasNext) {
+ reuse = iter.next
+ i = 0
+ while (i < aggregates.length) {
+ val accumulator =
accumulators.getField(i).asInstanceOf[Accumulator]
+ aggregates(i).accumulate(accumulator,
reuse.getField(aggFields(i)))
+ i += 1
+ }
+ }
+
+ //set the values of the result with current elements values if needed
+ i = 0
+ while (i < forwardedFieldCount) {
+ output.setField(i, reuse.getField(i))
+ i += 1
+ }
+
+ //set the values of the result with the accumulators
+ i = 0
+ while (i < aggregates.length) {
+ val index = forwardedFieldCount + i
+ val accumulator = accumulators.getField(i).asInstanceOf[Accumulator]
+ output.setField(index, aggregates(i).getValue(accumulator))
+ i += 1
+ }
+
+ out.collect(output)
+
--- End diff --
need not new line.
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