| // 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.impala.catalog; |
| |
| import java.util.List; |
| |
| import org.apache.impala.analysis.QueryStmt; |
| |
| /** |
| * Frontend interface for interacting with a view. |
| */ |
| public interface FeView extends FeTable { |
| |
| /** |
| * @return true if this is a local view (i.e. one defined in a WITH clause) |
| */ |
| boolean isLocalView(); |
| |
| /** |
| * @return the query statement that was parsed to create this view |
| */ |
| QueryStmt getQueryStmt(); |
| |
| /** |
| * @return the explicit column labels for this view, or null if they need to be derived |
| * entirely from the underlying query statement. The returned list has at least as many |
| * elements as the number of column labels in the query statement. |
| */ |
| List<String> getColLabels(); |
| |
| } |