mirror of https://github.com/citusdata/citus.git
264 lines
9.2 KiB
SQL
264 lines
9.2 KiB
SQL
-- ===================================================================
|
|
-- test end-to-end query functionality
|
|
-- ===================================================================
|
|
|
|
CREATE TABLE articles (
|
|
id bigint NOT NULL,
|
|
author_id bigint NOT NULL,
|
|
title varchar(20) NOT NULL,
|
|
word_count integer NOT NULL CHECK (word_count > 0)
|
|
);
|
|
|
|
-- this table is used in a CTE test
|
|
CREATE TABLE authors ( name text, id bigint );
|
|
|
|
-- this table is used in router executor tests
|
|
CREATE TABLE articles_single_shard (LIKE articles);
|
|
|
|
SELECT master_create_distributed_table('articles', 'author_id', 'hash');
|
|
SELECT master_create_distributed_table('articles_single_shard', 'author_id', 'hash');
|
|
|
|
|
|
-- test when a table is distributed but no shards created yet
|
|
SELECT count(*) from articles;
|
|
|
|
SELECT master_create_worker_shards('articles', 2, 1);
|
|
SELECT master_create_worker_shards('articles_single_shard', 1, 1);
|
|
|
|
-- create a bunch of test data
|
|
INSERT INTO articles VALUES ( 1, 1, 'arsenous', 9572);
|
|
INSERT INTO articles VALUES ( 2, 2, 'abducing', 13642);
|
|
INSERT INTO articles VALUES ( 3, 3, 'asternal', 10480);
|
|
INSERT INTO articles VALUES ( 4, 4, 'altdorfer', 14551);
|
|
INSERT INTO articles VALUES ( 5, 5, 'aruru', 11389);
|
|
INSERT INTO articles VALUES ( 6, 6, 'atlases', 15459);
|
|
INSERT INTO articles VALUES ( 7, 7, 'aseptic', 12298);
|
|
INSERT INTO articles VALUES ( 8, 8, 'agatized', 16368);
|
|
INSERT INTO articles VALUES ( 9, 9, 'alligate', 438);
|
|
INSERT INTO articles VALUES (10, 10, 'aggrandize', 17277);
|
|
INSERT INTO articles VALUES (11, 1, 'alamo', 1347);
|
|
INSERT INTO articles VALUES (12, 2, 'archiblast', 18185);
|
|
INSERT INTO articles VALUES (13, 3, 'aseyev', 2255);
|
|
INSERT INTO articles VALUES (14, 4, 'andesite', 19094);
|
|
INSERT INTO articles VALUES (15, 5, 'adversa', 3164);
|
|
INSERT INTO articles VALUES (16, 6, 'allonym', 2);
|
|
INSERT INTO articles VALUES (17, 7, 'auriga', 4073);
|
|
INSERT INTO articles VALUES (18, 8, 'assembly', 911);
|
|
INSERT INTO articles VALUES (19, 9, 'aubergiste', 4981);
|
|
INSERT INTO articles VALUES (20, 10, 'absentness', 1820);
|
|
INSERT INTO articles VALUES (21, 1, 'arcading', 5890);
|
|
INSERT INTO articles VALUES (22, 2, 'antipope', 2728);
|
|
INSERT INTO articles VALUES (23, 3, 'abhorring', 6799);
|
|
INSERT INTO articles VALUES (24, 4, 'audacious', 3637);
|
|
INSERT INTO articles VALUES (25, 5, 'antehall', 7707);
|
|
INSERT INTO articles VALUES (26, 6, 'abington', 4545);
|
|
INSERT INTO articles VALUES (27, 7, 'arsenous', 8616);
|
|
INSERT INTO articles VALUES (28, 8, 'aerophyte', 5454);
|
|
INSERT INTO articles VALUES (29, 9, 'amateur', 9524);
|
|
INSERT INTO articles VALUES (30, 10, 'andelee', 6363);
|
|
INSERT INTO articles VALUES (31, 1, 'athwartships', 7271);
|
|
INSERT INTO articles VALUES (32, 2, 'amazon', 11342);
|
|
INSERT INTO articles VALUES (33, 3, 'autochrome', 8180);
|
|
INSERT INTO articles VALUES (34, 4, 'amnestied', 12250);
|
|
INSERT INTO articles VALUES (35, 5, 'aminate', 9089);
|
|
INSERT INTO articles VALUES (36, 6, 'ablation', 13159);
|
|
INSERT INTO articles VALUES (37, 7, 'archduchies', 9997);
|
|
INSERT INTO articles VALUES (38, 8, 'anatine', 14067);
|
|
INSERT INTO articles VALUES (39, 9, 'anchises', 10906);
|
|
INSERT INTO articles VALUES (40, 10, 'attemper', 14976);
|
|
INSERT INTO articles VALUES (41, 1, 'aznavour', 11814);
|
|
INSERT INTO articles VALUES (42, 2, 'ausable', 15885);
|
|
INSERT INTO articles VALUES (43, 3, 'affixal', 12723);
|
|
INSERT INTO articles VALUES (44, 4, 'anteport', 16793);
|
|
INSERT INTO articles VALUES (45, 5, 'afrasia', 864);
|
|
INSERT INTO articles VALUES (46, 6, 'atlanta', 17702);
|
|
INSERT INTO articles VALUES (47, 7, 'abeyance', 1772);
|
|
INSERT INTO articles VALUES (48, 8, 'alkylic', 18610);
|
|
INSERT INTO articles VALUES (49, 9, 'anyone', 2681);
|
|
INSERT INTO articles VALUES (50, 10, 'anjanette', 19519);
|
|
|
|
-- insert a single row for the test
|
|
INSERT INTO articles_single_shard VALUES (50, 10, 'anjanette', 19519);
|
|
|
|
-- first, test zero-shard SELECT, which should return an empty row
|
|
SELECT COUNT(*) FROM articles WHERE author_id = 1 AND author_id = 2;
|
|
|
|
-- zero-shard modifications should fail
|
|
UPDATE articles SET title = '' WHERE author_id = 1 AND author_id = 2;
|
|
DELETE FROM articles WHERE author_id = 1 AND author_id = 2;
|
|
|
|
-- single-shard tests
|
|
|
|
-- test simple select for a single row
|
|
SELECT * FROM articles WHERE author_id = 10 AND id = 50;
|
|
|
|
-- get all titles by a single author
|
|
SELECT title FROM articles WHERE author_id = 10;
|
|
|
|
-- try ordering them by word count
|
|
SELECT title, word_count FROM articles
|
|
WHERE author_id = 10
|
|
ORDER BY word_count DESC NULLS LAST;
|
|
|
|
-- look at last two articles by an author
|
|
SELECT title, id FROM articles
|
|
WHERE author_id = 5
|
|
ORDER BY id
|
|
LIMIT 2;
|
|
|
|
-- find all articles by two authors in same shard
|
|
SELECT title, author_id FROM articles
|
|
WHERE author_id = 7 OR author_id = 8
|
|
ORDER BY author_id ASC, id;
|
|
|
|
-- add in some grouping expressions, still on same shard
|
|
-- having queries unsupported in Citus
|
|
SELECT author_id, sum(word_count) AS corpus_size FROM articles
|
|
WHERE author_id = 1 OR author_id = 7 OR author_id = 8 OR author_id = 10
|
|
GROUP BY author_id
|
|
HAVING sum(word_count) > 40000
|
|
ORDER BY sum(word_count) DESC;
|
|
|
|
-- UNION/INTERSECT queries are unsupported
|
|
SELECT * FROM articles WHERE author_id = 10 UNION
|
|
SELECT * FROM articles WHERE author_id = 1;
|
|
|
|
-- queries using CTEs are unsupported
|
|
WITH long_names AS ( SELECT id FROM authors WHERE char_length(name) > 15 )
|
|
SELECT title FROM articles;
|
|
|
|
-- queries which involve functions in FROM clause are unsupported.
|
|
SELECT * FROM articles, position('om' in 'Thomas');
|
|
|
|
-- subqueries are not supported in WHERE clause in Citus
|
|
SELECT * FROM articles WHERE author_id IN (SELECT id FROM authors WHERE name LIKE '%a');
|
|
|
|
-- subqueries are supported in FROM clause
|
|
SELECT articles.id,test.word_count
|
|
FROM articles, (SELECT id, word_count FROM articles) AS test WHERE test.id = articles.id
|
|
ORDER BY articles.id;
|
|
|
|
-- subqueries are not supported in SELECT clause
|
|
SELECT a.title AS name, (SELECT a2.id FROM authors a2 WHERE a.id = a2.id LIMIT 1)
|
|
AS special_price FROM articles a;
|
|
|
|
-- joins are not supported between local and distributed tables
|
|
SELECT title, authors.name FROM authors, articles WHERE authors.id = articles.author_id;
|
|
|
|
-- inner joins are not supported (I think)
|
|
SELECT * FROM (articles INNER JOIN authors ON articles.id = authors.id);
|
|
|
|
-- test use of EXECUTE statements within plpgsql
|
|
DO $sharded_execute$
|
|
BEGIN
|
|
EXECUTE 'SELECT COUNT(*) FROM articles ' ||
|
|
'WHERE author_id = $1 AND author_id = $2' USING 1, 2;
|
|
END
|
|
$sharded_execute$;
|
|
|
|
-- test use of bare SQL within plpgsql
|
|
DO $sharded_sql$
|
|
BEGIN
|
|
SELECT COUNT(*) FROM articles WHERE author_id = 1 AND author_id = 2;
|
|
END
|
|
$sharded_sql$;
|
|
|
|
-- test cross-shard queries
|
|
SELECT COUNT(*) FROM articles;
|
|
|
|
-- test with empty target list
|
|
SELECT FROM articles;
|
|
|
|
SELECT FROM articles WHERE author_id = 3737;
|
|
|
|
SELECT FROM articles WHERE word_count = 65500;
|
|
|
|
-- having queries unsupported in Citus
|
|
SELECT author_id, sum(word_count) AS corpus_size FROM articles
|
|
GROUP BY author_id
|
|
HAVING sum(word_count) > 25000
|
|
ORDER BY sum(word_count) DESC
|
|
LIMIT 5;
|
|
|
|
-- more proof Citus doesn't support having clauses
|
|
SELECT author_id FROM articles
|
|
GROUP BY author_id
|
|
HAVING sum(word_count) > 50000
|
|
ORDER BY author_id;
|
|
|
|
-- now, test the cases where Citus do or do not need to create
|
|
-- the master queries
|
|
SET citus.large_table_shard_count TO 2;
|
|
SET client_min_messages TO 'DEBUG2';
|
|
SET citus.task_executor_type TO 'real-time';
|
|
|
|
-- start with the simple lookup query
|
|
SELECT *
|
|
FROM articles
|
|
WHERE author_id = 1;
|
|
|
|
-- below query hits a single shard, so no need to create the master query
|
|
SELECT *
|
|
FROM articles
|
|
WHERE author_id = 1 OR author_id = 17;
|
|
|
|
-- below query hits two shards, so needs to create the master query
|
|
SELECT *
|
|
FROM articles
|
|
WHERE author_id = 1 OR author_id = 18;
|
|
|
|
-- rename the output columns on a no master query case
|
|
SELECT id as article_id, word_count * id as random_value
|
|
FROM articles
|
|
WHERE author_id = 1;
|
|
|
|
-- we can push down co-located joins to a single worker without the
|
|
-- master query being required for only the same tables
|
|
SELECT a.author_id as first_author, b.word_count as second_word_count
|
|
FROM articles a, articles b
|
|
WHERE a.author_id = 10 and a.author_id = b.author_id
|
|
LIMIT 3;
|
|
|
|
-- now show that JOINs with multiple tables are not router executable
|
|
-- they are executed by real-time executor
|
|
SELECT a.author_id as first_author, b.word_count as second_word_count
|
|
FROM articles a, articles_single_shard b
|
|
WHERE a.author_id = 10 and a.author_id = b.author_id
|
|
LIMIT 3;
|
|
|
|
-- do not create the master query for LIMIT on a single shard SELECT
|
|
SELECT *
|
|
FROM articles
|
|
WHERE author_id = 1
|
|
LIMIT 2;
|
|
|
|
-- This query hits a single shard. So GROUP BY can be
|
|
-- pushed down to the workers directly. This query is
|
|
-- equivalent to SELECT DISTINCT on a single shard.
|
|
SELECT id
|
|
FROM articles
|
|
WHERE author_id = 1
|
|
GROUP BY id;
|
|
|
|
-- copying from a single shard table does not require the master query
|
|
COPY articles_single_shard TO stdout;
|
|
|
|
-- error out for queries with aggregates
|
|
SELECT avg(word_count)
|
|
FROM articles
|
|
WHERE author_id = 2;
|
|
|
|
-- max, min, sum, count is somehow implemented
|
|
-- differently in distributed planning
|
|
SELECT max(word_count) as max, min(word_count) as min,
|
|
sum(word_count) as sum, count(word_count) as cnt
|
|
FROM articles
|
|
WHERE author_id = 2;
|
|
|
|
-- error out for queries with repartition jobs
|
|
SELECT *
|
|
FROM articles a, articles b
|
|
WHERE a.id = b.id AND a.author_id = 1;
|
|
|
|
SET client_min_messages to 'NOTICE';
|