Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3700#discussion_r110479650
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/SortUtil.scala
---
@@ -0,0 +1,367 @@
+/*
+ * 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.table.calcite.FlinkTypeFactory
+import org.apache.flink.api.java.typeutils.RowTypeInfo
+import org.apache.flink.types.Row
+import org.apache.calcite.rel.`type`._
+import org.apache.calcite.rel.logical.LogicalSort
+import org.apache.flink.streaming.api.functions.ProcessFunction
+import org.apache.flink.table.functions.AggregateFunction
+import org.apache.calcite.sql.`type`.SqlTypeName
+import org.apache.flink.table.api.TableException
+import org.apache.calcite.sql.`type`.SqlTypeName
+import org.apache.calcite.sql.`type`.SqlTypeName._
+import org.apache.flink.table.functions.Accumulator
+import java.util.{ List => JList, ArrayList }
+import org.apache.flink.api.common.typeinfo.{ SqlTimeTypeInfo,
TypeInformation }
+import org.apache.flink.api.java.typeutils.RowTypeInfo
+import org.apache.flink.table.functions.aggfunctions.RowSortAggFunction
+import java.sql.Timestamp
+import org.apache.calcite.rel.RelFieldCollation
+import org.apache.calcite.rel.RelFieldCollation.Direction
+
+
+/**
+ * Class represents a collection of helper methods to build the sort logic.
+ * It encapsulates as well implementation for ordering and generic
interfaces
+ */
+
+object SortUtil {
+
+ /**
+ * Function creates
[org.apache.flink.streaming.api.functions.ProcessFunction] for sorting
+ * elements based on proctime and potentially other fields
+ * @param calcSort Sort logical object
+ * @param inputType input row type
+ * @return org.apache.flink.streaming.api.functions.ProcessFunction
+ */
+ private[flink] def createProcTimeSortFunction(
+ calcSort: LogicalSort,
+ inputType: RelDataType): ProcessFunction[Row, Row] = {
+
+ val keySortFields = getSortFieldIndexList(calcSort)
+ val keySortDirections = getSortFieldDirectionList(calcSort)
+ val sortAggregates = createSortAggregation(inputType,
keySortFields,keySortDirections, false)
+
+ val aggType = createSingleAccumulatorRowType(sortAggregates)
+
+ new ProcTimeUnboundedSortProcessFunction(
+ sortAggregates,
+ inputType.getFieldCount,
+ aggType)
+
+ }
+
+
+ /**
+ * Function creates a sorting aggregation object
+ * elements based on proctime and potentially other fields
+ * @param inputType input row type
+ * @param keyIndex the indexes of the fields on which the sorting is
done.
+ * @param keySortDirections the directions of the sorts for each field.
+ * First is expected to be the time
+ * @return SortAggregationFunction
+ */
+ private def createSortAggregation(
+ inputType: RelDataType,
+ keyIndex: Array[Int],
+ keySortDirections: Array[Direction],
+ retraction: Boolean): MultiOutputAggregateFunction[_] = {
+
+ val orderings = createOrderingComparison(inputType, keyIndex)
--- End diff --
We can generate `TypeComparator` from `TypeInformation`
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