| /* |
| * 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 projection push-down to a [[TableSource]]. |
| * A [[TableSource]] extending this interface is able to project the fields of the return table. |
| */ |
| trait ProjectableTableSource { |
| |
| /** |
| * Creates a copy of the [[TableSource]] that projects its output on the specified fields. |
| * |
| * @param fields The indexes of the fields to return. |
| * @return A copy of the [[TableSource]] that projects its output. |
| */ |
| def projectFields(fields: Array[Int]): TableSource |
| |
| } |
