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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/*
* 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.
*/
LOAD 'age';
SET search_path TO ag_catalog;
SELECT create_graph('cypher_union');
NOTICE: graph "cypher_union" has been created
create_graph
--------------
(1 row)
SELECT * FROM cypher('cypher_union', $$CREATE ()$$) as (a agtype);
a
---
(0 rows)
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION MATCH (n) RETURN n$$) as (a agtype);
a
----------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {}}::vertex
(1 row)
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION ALL MATCH (n) RETURN n$$) as (a agtype);
a
----------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {}}::vertex
{"id": 281474976710657, "label": "", "properties": {}}::vertex
(2 rows)
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION RETURN 1$$) as (a agtype);
a
----------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {}}::vertex
1
(2 rows)
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION RETURN NULL$$) as (a agtype);
a
----------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {}}::vertex
(2 rows)
SELECT * FROM cypher('cypher_union', $$RETURN [1,2,3] UNION RETURN 1$$) as (a agtype);
a
-----------
[1, 2, 3]
1
(2 rows)
/*should return 1 row*/
SELECT * FROM cypher('cypher_union', $$RETURN NULL UNION RETURN NULL$$) AS (result agtype);
result
--------
(1 row)
/*should return 2 rows*/
SELECT * FROM cypher('cypher_union', $$RETURN NULL UNION ALL RETURN NULL$$) AS (result agtype);
result
--------
(2 rows)
/*
*multiple unions, precedence
*/
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION MATCH (n) RETURN n UNION MATCH (n) RETURN n$$) AS (result agtype);
result
----------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {}}::vertex
(1 row)
/*should return triple*/
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION ALL MATCH (n) RETURN n UNION ALL MATCH(n) RETURN n$$) AS (result agtype);
result
----------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {}}::vertex
{"id": 281474976710657, "label": "", "properties": {}}::vertex
{"id": 281474976710657, "label": "", "properties": {}}::vertex
(3 rows)
/*should return single*/
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION ALL MATCH (n) RETURN n UNION MATCH(n) RETURN n$$) AS (result agtype);
result
----------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {}}::vertex
(1 row)
/*should return just a pair*/
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION MATCH (n) RETURN n UNION ALL MATCH(n) RETURN n$$) AS (result agtype);
result
----------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {}}::vertex
{"id": 281474976710657, "label": "", "properties": {}}::vertex
(2 rows)
/*should return 3 null rows*/
SELECT * FROM cypher('cypher_union', $$RETURN NULL UNION ALL RETURN NULL UNION ALL RETURN NULL$$) AS (result agtype);
result
--------
(3 rows)
/*should return 1 null row*/
SELECT * FROM cypher('cypher_union', $$RETURN NULL UNION ALL RETURN NULL UNION RETURN NULL$$) AS (result agtype);
result
--------
(1 row)
/*should return 2 null rows*/
SELECT * FROM cypher('cypher_union', $$RETURN NULL UNION RETURN NULL UNION ALL RETURN NULL$$) AS (result agtype);
result
--------
(2 rows)
/* scoping */
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION ALL MATCH (m) RETURN n$$) AS (result agtype);
ERROR: could not find rte for n
LINE 2: ..., $$MATCH (n) RETURN n UNION ALL MATCH (m) RETURN n$$) AS (r...
^
/*
*UNION and UNION ALL, type casting
*/
SELECT * FROM cypher('cypher_union', $$RETURN 1.0::int UNION RETURN 1::float UNION ALL RETURN 2.0::float$$) AS (result agtype);
result
--------
1
2.0
(2 rows)
SELECT * FROM cypher('cypher_union', $$RETURN 1.0::int UNION RETURN 1.0::float UNION ALL RETURN 1::int$$) AS (result agtype);
result
--------
1
1
(2 rows)
SELECT * FROM cypher('cypher_union', $$RETURN 1.0::float UNION RETURN 1::int UNION RETURN 1::float$$) AS (result agtype);
result
--------
1.0
(1 row)
SELECT drop_graph('cypher_union', true);
NOTICE: drop cascades to 2 other objects
DETAIL: drop cascades to table cypher_union._ag_label_vertex
drop cascades to table cypher_union._ag_label_edge
NOTICE: graph "cypher_union" has been dropped
drop_graph
------------
(1 row)
|
