1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item;
19
20 import org.apache.shardingsphere.sql.parser.sql.common.segment.SQLSegment;
21
22 /**
23 * Projection segment.
24 */
25 public interface ProjectionSegment extends SQLSegment {
26
27 /**
28 * Get column label.
29 *
30 * @return column label
31 */
32 String getColumnLabel();
33
34 /**
35 * Judge whether column is visible or not.
36 *
37 * @return whether column is visible or not
38 */
39 default boolean isVisible() {
40 return true;
41 }
42 }