| /* |
| * 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.scala._ |
| import org.apache.flink.table.api.types.InternalType |
| import org.apache.flink.table.expressions.{Literal, _} |
| |
| /** |
| * built-in dense_rank aggregate function |
| */ |
| class DenseRankFunction(orderKeyType: Array[InternalType]) |
| extends RankLikeFunction(orderKeyType) { |
| |
| override def aggBufferAttributes: Seq[UnresolvedAggBufferReference] = sequence +: lastVal |
| |
| override def initialValuesExpressions: Seq[Expression] = |
| Literal(0L) +: orderKeyType.map(orderType => generateInitLiteral(orderType)) |
| |
| override def accumulateExpressions: Seq[Expression] = |
| If(orderEquals, sequence, sequence + 1) +: operands |
| } |
