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