This repository has been archived by the owner on Aug 2, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 186
/
NamedExpressionAnalyzer.java
61 lines (55 loc) 路 2.3 KB
/
NamedExpressionAnalyzer.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
/*
*
* Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* or in the "license" file accompanying this file. This file 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 com.amazon.opendistroforelasticsearch.sql.analysis;
import com.amazon.opendistroforelasticsearch.sql.ast.AbstractNodeVisitor;
import com.amazon.opendistroforelasticsearch.sql.ast.expression.Alias;
import com.amazon.opendistroforelasticsearch.sql.ast.expression.QualifiedName;
import com.amazon.opendistroforelasticsearch.sql.ast.expression.UnresolvedExpression;
import com.amazon.opendistroforelasticsearch.sql.expression.DSL;
import com.amazon.opendistroforelasticsearch.sql.expression.NamedExpression;
import lombok.RequiredArgsConstructor;
/**
* Analyze the Alias node in the {@link AnalysisContext} to construct the list of
* {@link NamedExpression}.
*/
@RequiredArgsConstructor
public class NamedExpressionAnalyzer extends
AbstractNodeVisitor<NamedExpression, AnalysisContext> {
private final ExpressionAnalyzer expressionAnalyzer;
/**
* Analyze Select fields.
*/
public NamedExpression analyze(UnresolvedExpression expression,
AnalysisContext analysisContext) {
return expression.accept(this, analysisContext);
}
@Override
public NamedExpression visitAlias(Alias node, AnalysisContext context) {
return DSL.named(
unqualifiedNameIfFieldOnly(node, context),
node.getDelegated().accept(expressionAnalyzer, context),
node.getAlias());
}
private String unqualifiedNameIfFieldOnly(Alias node, AnalysisContext context) {
UnresolvedExpression selectItem = node.getDelegated();
if (selectItem instanceof QualifiedName) {
QualifierAnalyzer qualifierAnalyzer = new QualifierAnalyzer(context);
return qualifierAnalyzer.unqualified((QualifiedName) selectItem);
}
return node.getName();
}
}