| /* |
| * 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.api.dataview |
| |
| import org.apache.flink.table.api.functions.AggregateFunction |
| |
| |
| /** |
| * A [[DataView]] is a collection type that can be used in the accumulator of an |
| * [[AggregateFunction]]. |
| * |
| * Depending on the context in which the [[AggregateFunction]] is |
| * used, a [[DataView]] can be backed by a Java heap collection or a state backend. |
| */ |
| trait DataView extends Serializable { |
| |
| /** |
| * Clears the [[DataView]] and removes all data. |
| */ |
| def clear(): Unit |
| |
| } |
