ClickHouse/tests/queries/0_stateless/03037_recursive_cte_postgres_3.sql
2024-04-28 12:52:17 +03:00

90 lines
2.9 KiB
SQL

/**
* Based on https://github.com/postgres/postgres/blob/master/src/test/regress/sql/with.sql, license:
*
* PostgreSQL Database Management System
* (formerly known as Postgres, then as Postgres95)
*
* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
*
* Portions Copyright (c) 1994, The Regents of the University of California
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without a written agreement
* is hereby granted, provided that the above copyright notice and this
* paragraph and the following two paragraphs appear in all copies.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
*PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
--
-- Tests for common table expressions (WITH query, ... SELECT ...)
--
-- { echoOn }
SET allow_experimental_analyzer = 1;
--
-- different tree example
--
DROP TABLE IF EXISTS tree;
CREATE TABLE tree(
id UInt64,
parent_id Nullable(UInt64)
)
ENGINE=TinyLog;
INSERT INTO tree
VALUES (1, NULL), (2, 1), (3,1), (4,2), (5,2), (6,2), (7,3), (8,3), (9,4), (10,4), (11,7), (12,7), (13,7), (14, 9), (15,11), (16,11);
--
-- get all paths from "second level" nodes to leaf nodes
--
WITH RECURSIVE t AS (
SELECT 1 AS id, []::Array(UInt64) AS path
UNION ALL
SELECT tree.id, arrayConcat(t.path, [tree.id])
FROM tree JOIN t ON (tree.parent_id = t.id)
)
SELECT t1.*, t2.* FROM t AS t1 JOIN t AS t2 ON
(t1.path[1] = t2.path[1] AND
length(t1.path) = 1 AND
length(t2.path) > 1)
ORDER BY t1.id, t2.id;
-- just count 'em
WITH RECURSIVE t AS (
SELECT 1 AS id, []::Array(UInt64) AS path
UNION ALL
SELECT tree.id, arrayConcat(t.path, [tree.id])
FROM tree JOIN t ON (tree.parent_id = t.id)
)
SELECT t1.id, count(t2.path) FROM t AS t1 JOIN t AS t2 ON
(t1.path[1] = t2.path[1] AND
length(t1.path) = 1 AND
length(t2.path) > 1)
GROUP BY t1.id
ORDER BY t1.id;
-- -- this variant tickled a whole-row-variable bug in 8.4devel
WITH RECURSIVE t AS (
SELECT 1 AS id, []::Array(UInt64) AS path
UNION ALL
SELECT tree.id, arrayConcat(t.path, [tree.id])
FROM tree JOIN t ON (tree.parent_id = t.id)
)
SELECT t1.id, t2.path, tuple(t2.*) FROM t AS t1 JOIN t AS t2 ON
(t1.id=t2.id);
-- { echoOff }