| /* |
| * 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.plan.nodes.calcite |
| |
| import java.util |
| |
| import org.apache.calcite.plan.{RelOptCluster, RelTraitSet} |
| import org.apache.calcite.rel.{RelNode, SingleRel} |
| |
| /** |
| * The LastRow node is used to select the last row for every key partition order by rowtime |
| * or nothing. If order by nothing, the result is not deterministic. It is also used to |
| * change an append stream source to an update stream. |
| */ |
| class LogicalLastRow( |
| cluster: RelOptCluster, |
| traits: RelTraitSet, |
| inputNode: RelNode, |
| val uniqueKeys: util.List[String]) |
| extends SingleRel(cluster, traits, inputNode){ |
| |
| override def copy(traitSet: RelTraitSet, inputs: util.List[RelNode]): RelNode = { |
| new LogicalLastRow(cluster, traitSet, inputs.get(0), uniqueKeys) |
| } |
| } |
