hequn8128 commented on a change in pull request #6787: [FLINK-8577][table] Implement proctime DataStream to Table upsert conversion URL: https://github.com/apache/flink/pull/6787#discussion_r236267734
########## File path: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/logical/rel/LogicalLastRow.scala ########## @@ -0,0 +1,54 @@ +/* + * 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.logical.rel + +import java.util + +import org.apache.calcite.plan.{RelOptCluster, RelTraitSet} +import org.apache.calcite.rel.{RelNode, SingleRel} + +/** + * Represent an upsert source. + * + * @param keyNames The upsert key names. + */ +class LogicalLastRow( Review comment: Year, I also think `LastRow` is not perfect. However, I can't find a better one. We can't name it `UpsertToRetractionsConverter ` since we don't always convert upsert to retractions in this node. `LastRow` does explain the purpose and the thing that it is doing, i.e. get the last row from the upsert stream by the defined key. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
