mirror of https://github.com/citusdata/citus.git
499 lines
17 KiB
Plaintext
499 lines
17 KiB
Plaintext
-- ===================================================================
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-- test end-to-end query functionality
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-- ===================================================================
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CREATE TABLE articles (
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id bigint NOT NULL,
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author_id bigint NOT NULL,
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title text NOT NULL,
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word_count integer NOT NULL CHECK (word_count > 0)
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);
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-- this table is used in a CTE test
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CREATE TABLE authors ( name text, id bigint );
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-- this table is used in router executor tests
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CREATE TABLE articles_single_shard (LIKE articles);
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SELECT master_create_distributed_table('articles', 'author_id', 'hash');
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master_create_distributed_table
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---------------------------------
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(1 row)
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SELECT master_create_distributed_table('articles_single_shard', 'author_id', 'hash');
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master_create_distributed_table
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---------------------------------
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(1 row)
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-- test when a table is distributed but no shards created yet
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SELECT count(*) from articles;
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count
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-------
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(1 row)
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SELECT master_create_worker_shards('articles', 2, 1);
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master_create_worker_shards
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-----------------------------
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(1 row)
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SELECT master_create_worker_shards('articles_single_shard', 1, 1);
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master_create_worker_shards
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-----------------------------
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(1 row)
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-- create a bunch of test data
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INSERT INTO articles VALUES ( 1, 1, 'arsenous', 9572);
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INSERT INTO articles VALUES ( 2, 2, 'abducing', 13642);
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INSERT INTO articles VALUES ( 3, 3, 'asternal', 10480);
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INSERT INTO articles VALUES ( 4, 4, 'altdorfer', 14551);
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INSERT INTO articles VALUES ( 5, 5, 'aruru', 11389);
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INSERT INTO articles VALUES ( 6, 6, 'atlases', 15459);
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INSERT INTO articles VALUES ( 7, 7, 'aseptic', 12298);
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INSERT INTO articles VALUES ( 8, 8, 'agatized', 16368);
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INSERT INTO articles VALUES ( 9, 9, 'alligate', 438);
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INSERT INTO articles VALUES (10, 10, 'aggrandize', 17277);
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INSERT INTO articles VALUES (11, 1, 'alamo', 1347);
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INSERT INTO articles VALUES (12, 2, 'archiblast', 18185);
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INSERT INTO articles VALUES (13, 3, 'aseyev', 2255);
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INSERT INTO articles VALUES (14, 4, 'andesite', 19094);
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INSERT INTO articles VALUES (15, 5, 'adversa', 3164);
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INSERT INTO articles VALUES (16, 6, 'allonym', 2);
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INSERT INTO articles VALUES (17, 7, 'auriga', 4073);
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INSERT INTO articles VALUES (18, 8, 'assembly', 911);
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INSERT INTO articles VALUES (19, 9, 'aubergiste', 4981);
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INSERT INTO articles VALUES (20, 10, 'absentness', 1820);
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INSERT INTO articles VALUES (21, 1, 'arcading', 5890);
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INSERT INTO articles VALUES (22, 2, 'antipope', 2728);
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INSERT INTO articles VALUES (23, 3, 'abhorring', 6799);
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INSERT INTO articles VALUES (24, 4, 'audacious', 3637);
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INSERT INTO articles VALUES (25, 5, 'antehall', 7707);
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INSERT INTO articles VALUES (26, 6, 'abington', 4545);
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INSERT INTO articles VALUES (27, 7, 'arsenous', 8616);
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INSERT INTO articles VALUES (28, 8, 'aerophyte', 5454);
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INSERT INTO articles VALUES (29, 9, 'amateur', 9524);
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INSERT INTO articles VALUES (30, 10, 'andelee', 6363);
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INSERT INTO articles VALUES (31, 1, 'athwartships', 7271);
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INSERT INTO articles VALUES (32, 2, 'amazon', 11342);
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INSERT INTO articles VALUES (33, 3, 'autochrome', 8180);
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INSERT INTO articles VALUES (34, 4, 'amnestied', 12250);
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INSERT INTO articles VALUES (35, 5, 'aminate', 9089);
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INSERT INTO articles VALUES (36, 6, 'ablation', 13159);
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INSERT INTO articles VALUES (37, 7, 'archduchies', 9997);
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INSERT INTO articles VALUES (38, 8, 'anatine', 14067);
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INSERT INTO articles VALUES (39, 9, 'anchises', 10906);
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INSERT INTO articles VALUES (40, 10, 'attemper', 14976);
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INSERT INTO articles VALUES (41, 1, 'aznavour', 11814);
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INSERT INTO articles VALUES (42, 2, 'ausable', 15885);
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INSERT INTO articles VALUES (43, 3, 'affixal', 12723);
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INSERT INTO articles VALUES (44, 4, 'anteport', 16793);
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INSERT INTO articles VALUES (45, 5, 'afrasia', 864);
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INSERT INTO articles VALUES (46, 6, 'atlanta', 17702);
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INSERT INTO articles VALUES (47, 7, 'abeyance', 1772);
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INSERT INTO articles VALUES (48, 8, 'alkylic', 18610);
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INSERT INTO articles VALUES (49, 9, 'anyone', 2681);
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INSERT INTO articles VALUES (50, 10, 'anjanette', 19519);
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-- insert a single row for the test
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INSERT INTO articles_single_shard VALUES (50, 10, 'anjanette', 19519);
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-- first, test zero-shard SELECT, which should return an empty row
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SELECT COUNT(*) FROM articles WHERE author_id = 1 AND author_id = 2;
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count
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-------
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(1 row)
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-- zero-shard modifications should fail
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UPDATE articles SET title = '' WHERE author_id = 1 AND author_id = 2;
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ERROR: distributed modifications must target exactly one shard
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DELETE FROM articles WHERE author_id = 1 AND author_id = 2;
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ERROR: distributed modifications must target exactly one shard
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-- single-shard tests
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-- test simple select for a single row
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SELECT * FROM articles WHERE author_id = 10 AND id = 50;
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id | author_id | title | word_count
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----+-----------+-----------+------------
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50 | 10 | anjanette | 19519
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(1 row)
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-- get all titles by a single author
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SELECT title FROM articles WHERE author_id = 10;
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title
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------------
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aggrandize
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absentness
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andelee
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attemper
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anjanette
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(5 rows)
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-- try ordering them by word count
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SELECT title, word_count FROM articles
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WHERE author_id = 10
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ORDER BY word_count DESC NULLS LAST;
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title | word_count
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------------+------------
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anjanette | 19519
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aggrandize | 17277
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attemper | 14976
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andelee | 6363
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absentness | 1820
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(5 rows)
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-- look at last two articles by an author
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SELECT title, id FROM articles
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WHERE author_id = 5
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ORDER BY id
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LIMIT 2;
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title | id
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---------+----
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aruru | 5
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adversa | 15
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(2 rows)
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-- find all articles by two authors in same shard
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SELECT title, author_id FROM articles
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WHERE author_id = 7 OR author_id = 8
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ORDER BY author_id ASC, id;
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title | author_id
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-------------+-----------
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aseptic | 7
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auriga | 7
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arsenous | 7
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archduchies | 7
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abeyance | 7
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agatized | 8
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assembly | 8
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aerophyte | 8
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anatine | 8
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alkylic | 8
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(10 rows)
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-- add in some grouping expressions, still on same shard
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-- having queries unsupported in Citus
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SELECT author_id, sum(word_count) AS corpus_size FROM articles
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WHERE author_id = 1 OR author_id = 7 OR author_id = 8 OR author_id = 10
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GROUP BY author_id
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HAVING sum(word_count) > 40000
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ORDER BY sum(word_count) DESC;
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ERROR: cannot perform distributed planning on this query
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DETAIL: Having qual is currently unsupported
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-- UNION/INTERSECT queries are unsupported
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SELECT * FROM articles WHERE author_id = 10 UNION
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SELECT * FROM articles WHERE author_id = 1;
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ERROR: cannot perform distributed planning on this query
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DETAIL: Union, Intersect, or Except are currently unsupported
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-- queries using CTEs are unsupported
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WITH long_names AS ( SELECT id FROM authors WHERE char_length(name) > 15 )
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SELECT title FROM articles;
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ERROR: cannot plan queries that include both regular and partitioned relations
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-- queries which involve functions in FROM clause are unsupported.
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SELECT * FROM articles, position('om' in 'Thomas');
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ERROR: cannot perform distributed planning on this query
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DETAIL: Complex table expressions are currently unsupported
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-- subqueries are not supported in WHERE clause in Citus
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SELECT * FROM articles WHERE author_id IN (SELECT id FROM authors WHERE name LIKE '%a');
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ERROR: cannot plan queries that include both regular and partitioned relations
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-- subqueries are supported in FROM clause
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SELECT articles.id,test.word_count
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FROM articles, (SELECT id, word_count FROM articles) AS test WHERE test.id = articles.id
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ORDER BY articles.id;
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id | word_count
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----+------------
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1 | 9572
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2 | 13642
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3 | 10480
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4 | 14551
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5 | 11389
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6 | 15459
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7 | 12298
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8 | 16368
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9 | 438
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10 | 17277
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11 | 1347
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12 | 18185
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13 | 2255
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14 | 19094
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15 | 3164
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16 | 2
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17 | 4073
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18 | 911
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19 | 4981
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20 | 1820
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21 | 5890
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22 | 2728
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23 | 6799
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24 | 3637
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25 | 7707
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26 | 4545
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27 | 8616
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28 | 5454
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29 | 9524
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30 | 6363
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31 | 7271
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32 | 11342
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33 | 8180
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34 | 12250
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35 | 9089
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36 | 13159
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37 | 9997
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38 | 14067
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39 | 10906
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40 | 14976
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41 | 11814
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42 | 15885
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43 | 12723
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44 | 16793
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45 | 864
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46 | 17702
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47 | 1772
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48 | 18610
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49 | 2681
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50 | 19519
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(50 rows)
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-- subqueries are not supported in SELECT clause
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SELECT a.title AS name, (SELECT a2.id FROM authors a2 WHERE a.id = a2.id LIMIT 1)
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AS special_price FROM articles a;
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ERROR: cannot perform distributed planning on this query
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DETAIL: Subqueries other than in from-clause are currently unsupported
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-- joins are not supported between local and distributed tables
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SELECT title, authors.name FROM authors, articles WHERE authors.id = articles.author_id;
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ERROR: cannot plan queries that include both regular and partitioned relations
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-- inner joins are not supported (I think)
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SELECT * FROM (articles INNER JOIN authors ON articles.id = authors.id);
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ERROR: cannot plan queries that include both regular and partitioned relations
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-- test use of EXECUTE statements within plpgsql
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DO $sharded_execute$
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BEGIN
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EXECUTE 'SELECT COUNT(*) FROM articles ' ||
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'WHERE author_id = $1 AND author_id = $2' USING 1, 2;
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END
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$sharded_execute$;
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-- test use of bare SQL within plpgsql
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DO $sharded_sql$
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BEGIN
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SELECT COUNT(*) FROM articles WHERE author_id = 1 AND author_id = 2;
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END
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$sharded_sql$;
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ERROR: query has no destination for result data
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HINT: If you want to discard the results of a SELECT, use PERFORM instead.
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CONTEXT: PL/pgSQL function inline_code_block line 3 at SQL statement
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-- test cross-shard queries
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SELECT COUNT(*) FROM articles;
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count
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-------
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50
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(1 row)
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-- having queries unsupported in Citus
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SELECT author_id, sum(word_count) AS corpus_size FROM articles
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GROUP BY author_id
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HAVING sum(word_count) > 25000
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ORDER BY sum(word_count) DESC
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LIMIT 5;
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ERROR: cannot perform distributed planning on this query
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DETAIL: Having qual is currently unsupported
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-- more proof Citus doesn't support having clauses
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SELECT author_id FROM articles
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GROUP BY author_id
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HAVING sum(word_count) > 50000
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ORDER BY author_id;
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ERROR: cannot perform distributed planning on this query
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DETAIL: Having qual is currently unsupported
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-- now, test the cases where Citus do or do not need to create
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-- the master queries
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SET citus.task_executor_type TO 'router';
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SET citus.large_table_shard_count TO 2;
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SET client_min_messages TO 'DEBUG2';
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-- start with the simple lookup query
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SELECT *
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FROM articles
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WHERE author_id = 1;
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DEBUG: predicate pruning for shardId 103094
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id | author_id | title | word_count
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----+-----------+--------------+------------
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1 | 1 | arsenous | 9572
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11 | 1 | alamo | 1347
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21 | 1 | arcading | 5890
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31 | 1 | athwartships | 7271
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41 | 1 | aznavour | 11814
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(5 rows)
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-- below query hits a single shard, so no need to create the master query
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SELECT *
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FROM articles
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WHERE author_id = 1 OR author_id = 17;
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DEBUG: predicate pruning for shardId 103094
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id | author_id | title | word_count
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----+-----------+--------------+------------
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1 | 1 | arsenous | 9572
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11 | 1 | alamo | 1347
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21 | 1 | arcading | 5890
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31 | 1 | athwartships | 7271
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41 | 1 | aznavour | 11814
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(5 rows)
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-- below query hits two shards, so needs to create the master query
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SELECT *
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FROM articles
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WHERE author_id = 1 OR author_id = 18;
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ERROR: cannot use router executor with queries that hit multiple shards
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HINT: Set citus.task_executor_type to "real-time" or "task-tracker".
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-- rename the output columns on a no master query case
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SELECT id as article_id, word_count * id as random_value
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FROM articles
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WHERE author_id = 1;
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DEBUG: predicate pruning for shardId 103094
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article_id | random_value
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------------+--------------
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1 | 9572
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11 | 14817
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21 | 123690
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31 | 225401
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41 | 484374
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(5 rows)
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-- we can push down co-located joins to a single worker without the
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-- master query being required for only the same tables
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SELECT a.author_id as first_author, b.word_count as second_word_count
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FROM articles a, articles b
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WHERE a.author_id = 10 and a.author_id = b.author_id
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LIMIT 3;
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DEBUG: push down of limit count: 3
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DEBUG: predicate pruning for shardId 103094
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DEBUG: join prunable for intervals [-2147483648,-1] and [0,2147483647]
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first_author | second_word_count
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--------------+-------------------
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10 | 17277
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10 | 1820
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10 | 6363
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(3 rows)
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-- now show that JOINs don't work with multiple tables
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SELECT a.author_id as first_author, b.word_count as second_word_count
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FROM articles a, articles_single_shard b
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WHERE a.author_id = 10 and a.author_id = b.author_id
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LIMIT 3;
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DEBUG: push down of limit count: 3
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DEBUG: predicate pruning for shardId 103094
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ERROR: cannot use router executor with JOINs
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HINT: Set citus.task_executor_type to "real-time" or "task-tracker".
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-- do not create the master query for LIMIT on a single shard SELECT
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SELECT *
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FROM articles
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WHERE author_id = 1
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LIMIT 2;
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DEBUG: push down of limit count: 2
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DEBUG: predicate pruning for shardId 103094
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id | author_id | title | word_count
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----+-----------+----------+------------
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1 | 1 | arsenous | 9572
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11 | 1 | alamo | 1347
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(2 rows)
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-- This query hits a single shard. So GROUP BY can be
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-- pushed down to the workers directly. This query is
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-- equivalent to SELECT DISTINCT on a single shard.
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SELECT id
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FROM articles
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WHERE author_id = 1
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GROUP BY id;
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DEBUG: predicate pruning for shardId 103094
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id
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----
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41
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11
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31
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1
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21
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(5 rows)
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-- copying from a single shard table does not require the master query
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COPY articles_single_shard TO stdout;
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50 10 anjanette 19519
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-- error out for queries with aggregates
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SELECT avg(word_count)
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FROM articles
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WHERE author_id = 2;
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DEBUG: predicate pruning for shardId 103093
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ERROR: cannot use router executor with aggregates
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HINT: Set citus.task_executor_type to "real-time" or "task-tracker".
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-- max, min, sum, count is somehow implemented
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-- differently in distributed planning but, still error out
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SELECT max(word_count) as max, min(word_count) as min,
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sum(word_count) as sum, count(word_count) as cnt
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FROM articles
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WHERE author_id = 2;
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DEBUG: predicate pruning for shardId 103093
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ERROR: cannot use router executor with aggregates
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HINT: Set citus.task_executor_type to "real-time" or "task-tracker".
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-- error out for queries with ORDER BY
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SELECT *
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FROM articles
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WHERE author_id = 1
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ORDER BY word_count;
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DEBUG: predicate pruning for shardId 103094
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ERROR: cannot use router executor with ORDER BY clauses
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HINT: Set citus.task_executor_type to "real-time" or "task-tracker".
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-- error out for queries with ORDER BY and LIMIT
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SELECT *
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FROM articles
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WHERE author_id = 1
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ORDER BY word_count
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LIMIT 2;
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DEBUG: push down of limit count: 2
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DEBUG: predicate pruning for shardId 103094
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ERROR: cannot use router executor with ORDER BY clauses
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HINT: Set citus.task_executor_type to "real-time" or "task-tracker".
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-- error out for queries with aggregates and GROUP BY
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SELECT max(word_count)
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FROM articles
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WHERE author_id = 1
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GROUP BY author_id;
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DEBUG: predicate pruning for shardId 103094
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ERROR: cannot use router executor with aggregates
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HINT: Set citus.task_executor_type to "real-time" or "task-tracker".
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-- error out for queries with repartition jobs
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SELECT *
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FROM articles a, articles b
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WHERE a.id = b.id AND a.author_id = 1;
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DEBUG: predicate pruning for shardId 103094
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DEBUG: join prunable for task partitionId 0 and 1
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DEBUG: join prunable for task partitionId 0 and 2
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DEBUG: join prunable for task partitionId 0 and 3
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DEBUG: join prunable for task partitionId 1 and 0
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DEBUG: join prunable for task partitionId 1 and 2
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DEBUG: join prunable for task partitionId 1 and 3
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DEBUG: join prunable for task partitionId 2 and 0
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DEBUG: join prunable for task partitionId 2 and 1
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DEBUG: join prunable for task partitionId 2 and 3
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DEBUG: join prunable for task partitionId 3 and 0
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DEBUG: join prunable for task partitionId 3 and 1
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DEBUG: join prunable for task partitionId 3 and 2
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DEBUG: pruning merge fetch taskId 1
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DETAIL: Creating dependency on merge taskId 3
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DEBUG: pruning merge fetch taskId 2
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DETAIL: Creating dependency on merge taskId 5
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DEBUG: pruning merge fetch taskId 4
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DETAIL: Creating dependency on merge taskId 5
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DEBUG: pruning merge fetch taskId 5
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DETAIL: Creating dependency on merge taskId 8
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DEBUG: pruning merge fetch taskId 7
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DETAIL: Creating dependency on merge taskId 7
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DEBUG: pruning merge fetch taskId 8
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DETAIL: Creating dependency on merge taskId 11
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DEBUG: pruning merge fetch taskId 10
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DETAIL: Creating dependency on merge taskId 9
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DEBUG: pruning merge fetch taskId 11
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DETAIL: Creating dependency on merge taskId 14
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ERROR: cannot use router executor with repartition jobs
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HINT: Set citus.task_executor_type to "task-tracker".
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-- error out for queries which hit more than 1 shards
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SELECT *
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FROM articles
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WHERE author_id >= 1 AND author_id <= 3;
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ERROR: cannot use router executor with queries that hit multiple shards
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HINT: Set citus.task_executor_type to "real-time" or "task-tracker".
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SET client_min_messages to 'NOTICE';
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SET citus.task_executor_type TO 'real-time';
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