| /* |
| * 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.expr |
| |
| import org.apache.flink.table.api.functions.DeclarativeAggregateFunction |
| import org.apache.flink.table.api.scala._ |
| import org.apache.flink.table.api.types.{DataTypes, DecimalType, InternalType} |
| import org.apache.flink.table.expressions._ |
| import org.apache.flink.table.dataformat.Decimal |
| |
| /** |
| * built-in sum aggregate function |
| */ |
| abstract class SumAggFunction extends DeclarativeAggregateFunction { |
| |
| override def inputCount: Int = 1 |
| |
| private lazy val sum = UnresolvedAggBufferReference("sum", getResultType) |
| |
| override def aggBufferAttributes: Seq[UnresolvedAggBufferReference] = Seq(sum) |
| |
| override def initialValuesExpressions: Seq[Expression] = Seq( |
| /* sum = */ Null(sum.resultType) |
| ) |
| |
| override def accumulateExpressions: Seq[Expression] = Seq( |
| /* sum = */ IsNull(operands(0)) ? (sum, IsNull(sum) ? (operands(0), sum + operands(0))) |
| ) |
| |
| override def mergeExpressions: Seq[Expression] = Seq( |
| If(IsNull(sum.right), sum.left, |
| If(IsNull(sum.left), sum.right, sum.left + sum.right)) |
| ) |
| |
| override def getValueExpression: Expression = sum |
| } |
| |
| /** |
| * Built-in Int Sum aggregate function |
| */ |
| class IntSumAggFunction extends SumAggFunction { |
| override def getResultType: InternalType = DataTypes.INT |
| } |
| |
| /** |
| * Built-in Byte Sum aggregate function |
| */ |
| class ByteSumAggFunction extends SumAggFunction { |
| override def getResultType: InternalType = DataTypes.BYTE |
| } |
| |
| /** |
| * Built-in Short Sum aggregate function |
| */ |
| class ShortSumAggFunction extends SumAggFunction { |
| override def getResultType: InternalType = DataTypes.SHORT |
| } |
| |
| /** |
| * Built-in Long Sum aggregate function |
| */ |
| class LongSumAggFunction extends SumAggFunction { |
| override def getResultType: InternalType = DataTypes.LONG |
| } |
| |
| /** |
| * Built-in Float Sum aggregate function |
| */ |
| class FloatSumAggFunction extends SumAggFunction { |
| override def getResultType: InternalType = DataTypes.FLOAT |
| } |
| |
| /** |
| * Built-in Double Sum aggregate function |
| */ |
| class DoubleSumAggFunction extends SumAggFunction { |
| override def getResultType: InternalType = DataTypes.DOUBLE |
| } |
| |
| /** |
| * Built-in Decimal Sum aggregate function |
| */ |
| class DecimalSumAggFunction(argType: DecimalType) |
| extends SumAggFunction { |
| override def getResultType: InternalType = |
| Decimal.inferAggSumType(argType.precision, argType.scale) |
| } |