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ASF GitHub Bot commented on FLINK-6241: --------------------------------------- Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/3676#discussion_r110032835 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateHelper.scala --- @@ -0,0 +1,73 @@ +/* + * 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.api.common.functions.Function +import org.apache.flink.types.Row + +/** + * Base class for Aggregate Helper Function. + */ +abstract class AggregateHelper extends Function { + + /** + * Calculate the results from accumulators, and set the results to the output + * + * @param accumulators the accumulators (saved in a row) which contains the current + * aggregated results + * @param output output results collected in a row + * @param rowOffset offset of the position (in the output row) where the accumulators + * starts + */ + def setOutput(accumulators: Row, output: Row, rowOffset: Int) + + /** + * Accumulate the input values to the accumulators + * + * @param accumulators the accumulators (saved in a row) which contains the current + * aggregated results + * @param input input values bundled in a row + */ + def accumulate(accumulators: Row, input: Row) + + /** + * Retract the input values from the accumulators + * + * @param accumulators the accumulators (saved in a row) which contains the current + * aggregated results + * @param input input values bundled in a row + */ + def retract(accumulators: Row, input: Row) + + /** + * Init the accumulators, and save them to a accumulators Row. + * + * @return a row of accumulators which contains the aggregated results + */ + def createAccumulator(): Row + + /** + * Init the accumulators, and save them to the input accumulators Row. + * + * @param input input values bundled in a row + * @param output output results collected in a row + */ + def forwardValueToOutput(input: Row, output: Row) --- End diff -- rename to `setForwardedFields()`? > codeGen dataStream aggregates that use ProcessFunction > ------------------------------------------------------ > > Key: FLINK-6241 > URL: https://issues.apache.org/jira/browse/FLINK-6241 > Project: Flink > Issue Type: Sub-task > Components: Table API & SQL > Reporter: Shaoxuan Wang > Assignee: Shaoxuan Wang > -- This message was sent by Atlassian JIRA (v6.3.15#6346)