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.infra.binder.context.segment.select.projection;
19
20 import org.apache.shardingsphere.sql.parser.sql.common.value.identifier.IdentifierValue;
21
22 import java.util.Optional;
23
24 /**
25 * Projection interface.
26 */
27 public interface Projection {
28
29 /**
30 * Get column name.
31 *
32 * @return column name
33 */
34 String getColumnName();
35
36 /**
37 * Get column label.
38 *
39 * @return column label
40 */
41 String getColumnLabel();
42
43 /**
44 * Get expression.
45 *
46 * @return expression
47 */
48 String getExpression();
49
50 /**
51 * Get alias.
52 *
53 * @return alias
54 */
55 Optional<IdentifierValue> getAlias();
56 }