/*
 * 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');

SELECT * FROM cypher('cypher_union', $$ CREATE () $$) as (a agtype);


SELECT * FROM cypher('cypher_union', $$ MATCH (n) RETURN n UNION MATCH (n) RETURN n $$) as (a agtype);

SELECT * FROM cypher('cypher_union', $$ MATCH (n) RETURN n UNION ALL MATCH (n) RETURN n $$) as (a agtype);

SELECT * FROM cypher('cypher_union', $$ MATCH (n) RETURN n UNION RETURN 1 $$) as (a agtype);

SELECT * FROM cypher('cypher_union', $$ MATCH (n) RETURN n UNION RETURN NULL $$) as (a agtype);

SELECT * FROM cypher('cypher_union', $$ RETURN [1,2,3] UNION RETURN 1 $$) as (a agtype);

/*should return 1 row*/
SELECT * FROM cypher('cypher_union', $$return NULL UNION return NULL $$) AS (result agtype);

/*should return 2 rows*/
SELECT * FROM cypher('cypher_union', $$return NULL UNION ALL return NULL $$) AS (result agtype);

/*
 *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);

/*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);

/*should return double*/
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION ALL MATCH (n) return n UNION MATCH(n) RETURN n$$) AS (result agtype);

/*should return just UNION*/
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION MATCH (n) return n UNION ALL MATCH(n) RETURN n$$) AS (result agtype);

/*should return 3 rows*/
SELECT * FROM cypher('cypher_union', $$RETURN NULL UNION ALL RETURN NULL UNION ALL RETURN NULL$$) AS (result agtype);

/*should return 2 rows*/
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION ALL MATCH (n) return n UNION MATCH(n) RETURN n$$) AS (result agtype);

/*should return 1 row*/
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION MATCH (n) return n UNION ALL MATCH(n) RETURN n$$) AS (result agtype);

/* scoping */
SELECT * FROM cypher('cypher_union', $$MATCH (n) RETURN n UNION ALL MATCH (m) RETURN n$$) AS (result agtype);

/*
 *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);

SELECT * FROM cypher('cypher_union', $$ RETURN 1.0::float UNION return 1::int UNION RETURN 1::float $$) AS (result agtype);


SELECT drop_graph('cypher_union', true);