| /* |
| * 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.sources |
| |
| /** |
| * Adds support for limiting push-down to a [[TableSource]]. |
| * A [[TableSource]] extending this interface is able to limit the number of records. |
| */ |
| trait LimitableTableSource { |
| |
| /** |
| * Check and push down the limit to the table source. |
| * |
| * @param limit the value which limit the number of records. |
| * @return A new cloned instance of [[TableSource]] |
| */ |
| def applyLimit(limit: Long): TableSource |
| |
| /** |
| * Return the flag to indicate whether limit push down has been tried. Must return true on |
| * the returned instance of [[applyLimit]]. |
| */ |
| def isLimitPushedDown: Boolean |
| } |
