| /* |
| * 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 |
| |
| import org.apache.flink.table.api.TableEnvironment |
| import org.apache.flink.table.expressions.{Expression, WindowReference} |
| import org.apache.flink.table.validate.{ValidationFailure, ValidationResult, ValidationSuccess} |
| |
| /** |
| * Logical super class for group windows. |
| * |
| * @param aliasAttribute window alias |
| * @param timeAttribute time field indicating event-time or processing-time |
| */ |
| abstract class LogicalWindow( |
| val aliasAttribute: Expression, |
| val timeAttribute: Expression) |
| extends Resolvable[LogicalWindow] with LogicalExprVisitable { |
| |
| def resolveExpressions(resolver: (Expression) => Expression): LogicalWindow = this |
| |
| def validate(tableEnv: TableEnvironment): ValidationResult = aliasAttribute match { |
| case WindowReference(_, _) => ValidationSuccess |
| case _ => ValidationFailure("Window reference for window expected.") |
| } |
| |
| override def toString: String = getClass.getSimpleName |
| |
| } |
