| /* |
| * 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.codegen.agg |
| |
| import org.apache.flink.table.codegen.{ExprCodeGenerator, GeneratedExpression} |
| |
| /** |
| * The base trait for code generating aggregate operations, such as accumulate and retract. |
| * The implementation including declarative and imperative. |
| */ |
| trait AggCodeGen { |
| |
| def createAccumulator(generator: ExprCodeGenerator): Seq[GeneratedExpression] |
| |
| def setAccumulator(generator: ExprCodeGenerator): String |
| |
| def getAccumulator(generator: ExprCodeGenerator): Seq[GeneratedExpression] |
| |
| def resetAccumulator(generator: ExprCodeGenerator): String |
| |
| def accumulate(generator: ExprCodeGenerator): String |
| |
| def retract(generator: ExprCodeGenerator): String |
| |
| def merge(generator: ExprCodeGenerator): String |
| |
| def getValue(generator: ExprCodeGenerator): GeneratedExpression |
| |
| def checkNeededMethods( |
| needAccumulate: Boolean = false, |
| needRetract: Boolean = false, |
| needMerge: Boolean = false, |
| needReset: Boolean = false): Unit |
| } |
