mirror of https://github.com/citusdata/citus.git
423 lines
20 KiB
Plaintext
423 lines
20 KiB
Plaintext
-- ===================================================================
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-- test recursive planning functionality with subqueries and CTEs
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-- ===================================================================
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CREATE SCHEMA subquery_and_ctes;
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SET search_path TO subquery_and_ctes, public;
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CREATE TABLE users_table_local AS SELECT * FROM users_table;
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SET client_min_messages TO DEBUG1;
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-- CTEs are recursively planned, and subquery foo is also recursively planned
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-- final plan becomes a router plan
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WITH cte AS (
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WITH local_cte AS (
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SELECT * FROM users_table_local
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),
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dist_cte AS (
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SELECT user_id FROM events_table
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)
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SELECT dist_cte.user_id FROM local_cte join dist_cte on dist_cte.user_id=local_cte.user_id
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)
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SELECT
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count(*)
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FROM
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cte,
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(SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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ORDER BY 1 DESC LIMIT 5
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) as foo
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WHERE foo.user_id = cte.user_id;
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DEBUG: generating subplan 2_1 for CTE cte: WITH local_cte AS (SELECT users_table_local.user_id, users_table_local."time", users_table_local.value_1, users_table_local.value_2, users_table_local.value_3, users_table_local.value_4 FROM subquery_and_ctes.users_table_local), dist_cte AS (SELECT events_table.user_id FROM public.events_table) SELECT dist_cte.user_id FROM (local_cte JOIN dist_cte ON ((dist_cte.user_id = local_cte.user_id)))
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DEBUG: generating subplan 3_1 for CTE local_cte: SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM subquery_and_ctes.users_table_local
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DEBUG: generating subplan 3_2 for CTE dist_cte: SELECT user_id FROM public.events_table
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DEBUG: push down of limit count: 5
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DEBUG: generating subplan 2_2 for subquery SELECT DISTINCT users_table.user_id FROM public.users_table, public.events_table WHERE ((users_table.user_id = events_table.user_id) AND (events_table.event_type = ANY (ARRAY[1, 2, 3, 4]))) ORDER BY users_table.user_id DESC LIMIT 5
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count
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-------
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1644
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(1 row)
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-- CTEs are recursively planned, and subquery foo is also recursively planned
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-- final plan becomes a real-time plan since we also have events_table in the
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-- range table entries
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WITH cte AS (
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WITH local_cte AS (
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SELECT * FROM users_table_local
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),
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dist_cte AS (
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SELECT user_id FROM events_table
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)
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SELECT dist_cte.user_id FROM local_cte join dist_cte on dist_cte.user_id=local_cte.user_id
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)
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SELECT
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count(*)
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FROM
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cte,
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(SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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ORDER BY 1 DESC LIMIT 5
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) as foo, events_table
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WHERE foo.user_id = cte.user_id AND events_table.user_id = cte.user_id;
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DEBUG: generating subplan 6_1 for CTE cte: WITH local_cte AS (SELECT users_table_local.user_id, users_table_local."time", users_table_local.value_1, users_table_local.value_2, users_table_local.value_3, users_table_local.value_4 FROM subquery_and_ctes.users_table_local), dist_cte AS (SELECT events_table.user_id FROM public.events_table) SELECT dist_cte.user_id FROM (local_cte JOIN dist_cte ON ((dist_cte.user_id = local_cte.user_id)))
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DEBUG: generating subplan 7_1 for CTE local_cte: SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM subquery_and_ctes.users_table_local
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DEBUG: generating subplan 7_2 for CTE dist_cte: SELECT user_id FROM public.events_table
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DEBUG: push down of limit count: 5
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DEBUG: generating subplan 6_2 for subquery SELECT DISTINCT users_table.user_id FROM public.users_table, public.events_table WHERE ((users_table.user_id = events_table.user_id) AND (events_table.event_type = ANY (ARRAY[1, 2, 3, 4]))) ORDER BY users_table.user_id DESC LIMIT 5
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count
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-------
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30608
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(1 row)
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-- CTEs are replaced and subquery in WHERE is also replaced
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-- but the query is still real-time query since users_table is in the
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-- range table list
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WITH cte AS (
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WITH local_cte AS (
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SELECT * FROM users_table_local
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),
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dist_cte AS (
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SELECT user_id FROM events_table
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)
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SELECT dist_cte.user_id FROM local_cte join dist_cte on dist_cte.user_id=local_cte.user_id
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)
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SELECT DISTINCT cte.user_id
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FROM users_table, cte
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WHERE
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users_table.user_id = cte.user_id AND
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users_table.user_id IN (SELECT DISTINCT value_2 FROM users_table WHERE value_1 >= 1 AND value_1 <= 20 ORDER BY 1 LIMIT 5)
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ORDER BY 1 DESC;
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DEBUG: generating subplan 10_1 for CTE cte: WITH local_cte AS (SELECT users_table_local.user_id, users_table_local."time", users_table_local.value_1, users_table_local.value_2, users_table_local.value_3, users_table_local.value_4 FROM subquery_and_ctes.users_table_local), dist_cte AS (SELECT events_table.user_id FROM public.events_table) SELECT dist_cte.user_id FROM (local_cte JOIN dist_cte ON ((dist_cte.user_id = local_cte.user_id)))
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DEBUG: generating subplan 11_1 for CTE local_cte: SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM subquery_and_ctes.users_table_local
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DEBUG: generating subplan 11_2 for CTE dist_cte: SELECT user_id FROM public.events_table
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DEBUG: push down of limit count: 5
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DEBUG: generating subplan 10_2 for subquery SELECT DISTINCT value_2 FROM public.users_table WHERE ((value_1 >= 1) AND (value_1 <= 20)) ORDER BY value_2 LIMIT 5
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user_id
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---------
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4
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3
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2
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1
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(4 rows)
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-- a very similar query as the above, but this time errors
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-- out since we don't support subqueries in WHERE clause
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-- when there is only intermediate results on the range table
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-- note that this time subquery in WHERE clause is not replaced
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WITH cte AS (
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WITH local_cte AS (
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SELECT * FROM users_table_local
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),
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dist_cte AS (
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SELECT user_id FROM events_table
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)
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SELECT dist_cte.user_id FROM local_cte join dist_cte on dist_cte.user_id=local_cte.user_id
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)
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SELECT DISTINCT cte.user_id
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FROM cte
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WHERE
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cte.user_id IN (SELECT DISTINCT user_id FROM users_table WHERE value_1 >= 1 AND value_1 <= 20)
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ORDER BY 1 DESC;
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DEBUG: generating subplan 14_1 for CTE cte: WITH local_cte AS (SELECT users_table_local.user_id, users_table_local."time", users_table_local.value_1, users_table_local.value_2, users_table_local.value_3, users_table_local.value_4 FROM subquery_and_ctes.users_table_local), dist_cte AS (SELECT events_table.user_id FROM public.events_table) SELECT dist_cte.user_id FROM (local_cte JOIN dist_cte ON ((dist_cte.user_id = local_cte.user_id)))
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DEBUG: generating subplan 15_1 for CTE local_cte: SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM subquery_and_ctes.users_table_local
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DEBUG: generating subplan 15_2 for CTE dist_cte: SELECT user_id FROM public.events_table
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ERROR: cannot pushdown the subquery
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DETAIL: Complex subqueries and CTEs are not allowed in the FROM clause when the query has subqueries in the WHERE clause
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-- CTEs inside a subquery and the final query becomes a router
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-- query
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SELECT
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user_id
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FROM
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(
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WITH cte AS (
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SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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) SELECT * FROM cte ORDER BY 1 DESC
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) as foo;
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DEBUG: generating subplan 17_1 for CTE cte: SELECT DISTINCT users_table.user_id FROM public.users_table, public.events_table WHERE ((users_table.user_id = events_table.user_id) AND (events_table.event_type = ANY (ARRAY[1, 2, 3, 4])))
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user_id
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---------
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6
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5
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4
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3
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2
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1
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(6 rows)
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-- CTEs inside a subquery and the final query becomes a
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-- real-time query since the other subquery is safe to pushdown
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SELECT
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bar.user_id
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FROM
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(
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WITH cte AS (
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SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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) SELECT * FROM cte ORDER BY 1 DESC
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) as foo,
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(
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SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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) as bar
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WHERE foo.user_id = bar.user_id;
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DEBUG: generating subplan 19_1 for CTE cte: SELECT DISTINCT users_table.user_id FROM public.users_table, public.events_table WHERE ((users_table.user_id = events_table.user_id) AND (events_table.event_type = ANY (ARRAY[1, 2, 3, 4])))
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user_id
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---------
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5
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1
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4
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3
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6
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2
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(6 rows)
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-- CTEs inside a deeper subquery
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-- and also the subquery that contains the CTE is replaced
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SELECT
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DISTINCT bar.user_id
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FROM
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(
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WITH cte AS (
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SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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) SELECT * FROM cte ORDER BY 1 DESC
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) as foo,
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(
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SELECT
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users_table.user_id, some_events.event_type
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FROM
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users_table,
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(
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WITH cte AS (
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SELECT
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event_type, users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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value_1 IN (1,2)
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) SELECT * FROM cte ORDER BY 1 DESC
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) as some_events
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WHERE
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users_table.user_id = some_events.user_id AND
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event_type IN (1,2,3,4)
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ORDER BY 2,1
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LIMIT 2
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) as bar
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WHERE foo.user_id = bar.user_id
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ORDER BY 1 DESC LIMIT 5;
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DEBUG: generating subplan 21_1 for CTE cte: SELECT DISTINCT users_table.user_id FROM public.users_table, public.events_table WHERE ((users_table.user_id = events_table.user_id) AND (events_table.event_type = ANY (ARRAY[1, 2, 3, 4])))
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DEBUG: generating subplan 21_2 for CTE cte: SELECT events_table.event_type, users_table.user_id FROM public.users_table, public.events_table WHERE ((users_table.user_id = events_table.user_id) AND (users_table.value_1 = ANY (ARRAY[1, 2])))
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DEBUG: push down of limit count: 2
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DEBUG: generating subplan 21_3 for subquery SELECT users_table.user_id, some_events.event_type FROM public.users_table, (SELECT cte.event_type, cte.user_id FROM (SELECT intermediate_result.event_type, intermediate_result.user_id FROM read_intermediate_result('21_2'::text, 'binary'::citus_copy_format) intermediate_result(event_type integer, user_id integer)) cte ORDER BY cte.event_type DESC) some_events WHERE ((users_table.user_id = some_events.user_id) AND (some_events.event_type = ANY (ARRAY[1, 2, 3, 4]))) ORDER BY some_events.event_type, users_table.user_id LIMIT 2
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user_id
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---------
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1
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(1 row)
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-- CTEs on the different parts of the query is replaced
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-- and subquery foo is also replaced since it contains
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-- DISTINCT on a non-partition key
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SELECT * FROM
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(
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WITH cte AS (
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WITH local_cte AS (
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SELECT * FROM users_table_local
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),
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dist_cte AS (
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SELECT user_id FROM events_table
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)
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SELECT dist_cte.user_id FROM local_cte join dist_cte on dist_cte.user_id=local_cte.user_id
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)
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SELECT DISTINCT cte.user_id
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FROM users_table, cte
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WHERE
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users_table.user_id = cte.user_id AND
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users_table.user_id IN
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(WITH cte_in_where AS (SELECT DISTINCT value_2 FROM users_table WHERE value_1 >= 1 AND value_1 <= 20 ORDER BY 1 LIMIT 5) SELECT * FROM cte_in_where)
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ORDER BY 1 DESC
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) as foo,
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events_table
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WHERE
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foo.user_id = events_table.value_2
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ORDER BY 3 DESC, 2 DESC, 1 DESC
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LIMIT 5;
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DEBUG: generating subplan 25_1 for CTE cte: WITH local_cte AS (SELECT users_table_local.user_id, users_table_local."time", users_table_local.value_1, users_table_local.value_2, users_table_local.value_3, users_table_local.value_4 FROM subquery_and_ctes.users_table_local), dist_cte AS (SELECT events_table.user_id FROM public.events_table) SELECT dist_cte.user_id FROM (local_cte JOIN dist_cte ON ((dist_cte.user_id = local_cte.user_id)))
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DEBUG: generating subplan 26_1 for CTE local_cte: SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM subquery_and_ctes.users_table_local
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DEBUG: generating subplan 26_2 for CTE dist_cte: SELECT user_id FROM public.events_table
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DEBUG: generating subplan 25_2 for CTE cte_in_where: SELECT DISTINCT value_2 FROM public.users_table WHERE ((value_1 >= 1) AND (value_1 <= 20)) ORDER BY value_2 LIMIT 5
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DEBUG: push down of limit count: 5
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DEBUG: generating subplan 25_3 for subquery SELECT DISTINCT cte.user_id FROM public.users_table, (SELECT intermediate_result.user_id FROM read_intermediate_result('25_1'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer)) cte WHERE ((users_table.user_id = cte.user_id) AND (users_table.user_id IN (SELECT cte_in_where.value_2 FROM (SELECT intermediate_result.value_2 FROM read_intermediate_result('25_2'::text, 'binary'::citus_copy_format) intermediate_result(value_2 integer)) cte_in_where))) ORDER BY cte.user_id DESC
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DEBUG: push down of limit count: 5
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user_id | user_id | time | event_type | value_2 | value_3 | value_4
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---------+---------+---------------------------------+------------+---------+---------+---------
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4 | 1 | Thu Nov 23 21:54:46.924477 2017 | 6 | 4 | 5 |
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2 | 4 | Thu Nov 23 18:10:21.338399 2017 | 1 | 2 | 4 |
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4 | 3 | Thu Nov 23 18:08:26.550729 2017 | 2 | 4 | 3 |
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2 | 3 | Thu Nov 23 16:44:41.903713 2017 | 4 | 2 | 2 |
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1 | 3 | Thu Nov 23 16:31:56.219594 2017 | 5 | 1 | 2 |
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(5 rows)
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-- now recursively plan subqueries inside the CTEs that contains LIMIT and OFFSET
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WITH cte AS (
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WITH local_cte AS (
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SELECT * FROM users_table_local
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),
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dist_cte AS (
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SELECT
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user_id
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FROM
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events_table,
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(SELECT DISTINCT value_2 FROM users_table OFFSET 0) as foo
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WHERE
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events_table.user_id = foo.value_2 AND
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events_table.user_id IN (SELECT DISTINCT value_1 FROM users_table ORDER BY 1 LIMIT 3)
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)
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SELECT dist_cte.user_id FROM local_cte join dist_cte on dist_cte.user_id=local_cte.user_id
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)
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SELECT
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count(*)
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FROM
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cte,
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(SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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ORDER BY 1 DESC LIMIT 5
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) as foo
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WHERE foo.user_id = cte.user_id;
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DEBUG: generating subplan 30_1 for CTE cte: WITH local_cte AS (SELECT users_table_local.user_id, users_table_local."time", users_table_local.value_1, users_table_local.value_2, users_table_local.value_3, users_table_local.value_4 FROM subquery_and_ctes.users_table_local), dist_cte AS (SELECT events_table.user_id FROM public.events_table, (SELECT DISTINCT users_table.value_2 FROM public.users_table OFFSET 0) foo WHERE ((events_table.user_id = foo.value_2) AND (events_table.user_id IN (SELECT DISTINCT users_table.value_1 FROM public.users_table ORDER BY users_table.value_1 LIMIT 3)))) SELECT dist_cte.user_id FROM (local_cte JOIN dist_cte ON ((dist_cte.user_id = local_cte.user_id)))
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DEBUG: generating subplan 31_1 for CTE local_cte: SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM subquery_and_ctes.users_table_local
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DEBUG: generating subplan 31_2 for CTE dist_cte: SELECT events_table.user_id FROM public.events_table, (SELECT DISTINCT users_table.value_2 FROM public.users_table OFFSET 0) foo WHERE ((events_table.user_id = foo.value_2) AND (events_table.user_id IN (SELECT DISTINCT users_table.value_1 FROM public.users_table ORDER BY users_table.value_1 LIMIT 3)))
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DEBUG: push down of limit count: 3
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DEBUG: generating subplan 32_1 for subquery SELECT DISTINCT value_1 FROM public.users_table ORDER BY value_1 LIMIT 3
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DEBUG: generating subplan 32_2 for subquery SELECT DISTINCT value_2 FROM public.users_table OFFSET 0
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DEBUG: push down of limit count: 5
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DEBUG: generating subplan 30_2 for subquery SELECT DISTINCT users_table.user_id FROM public.users_table, public.events_table WHERE ((users_table.user_id = events_table.user_id) AND (events_table.event_type = ANY (ARRAY[1, 2, 3, 4]))) ORDER BY users_table.user_id DESC LIMIT 5
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count
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-------
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432
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(1 row)
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-- the same query, but this time the CTEs also live inside a subquery
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SELECT
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*
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FROM
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(
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WITH cte AS (
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WITH local_cte AS (
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SELECT * FROM users_table_local
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),
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dist_cte AS (
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SELECT
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user_id
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FROM
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events_table,
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(SELECT DISTINCT value_2 FROM users_table OFFSET 0) as foo
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WHERE
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events_table.user_id = foo.value_2 AND
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events_table.user_id IN (SELECT DISTINCT value_1 FROM users_table ORDER BY 1 LIMIT 3)
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)
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SELECT dist_cte.user_id FROM local_cte join dist_cte on dist_cte.user_id=local_cte.user_id
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)
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SELECT
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count(*) as cnt
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FROM
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cte,
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(SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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ORDER BY 1 DESC LIMIT 5
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) as foo
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WHERE foo.user_id = cte.user_id
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) as foo, users_table WHERE foo.cnt > users_table.value_2
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ORDER BY 3 DESC, 1 DESC, 2 DESC, 4 DESC
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LIMIT 5;
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DEBUG: generating subplan 36_1 for CTE cte: WITH local_cte AS (SELECT users_table_local.user_id, users_table_local."time", users_table_local.value_1, users_table_local.value_2, users_table_local.value_3, users_table_local.value_4 FROM subquery_and_ctes.users_table_local), dist_cte AS (SELECT events_table.user_id FROM public.events_table, (SELECT DISTINCT users_table.value_2 FROM public.users_table OFFSET 0) foo WHERE ((events_table.user_id = foo.value_2) AND (events_table.user_id IN (SELECT DISTINCT users_table.value_1 FROM public.users_table ORDER BY users_table.value_1 LIMIT 3)))) SELECT dist_cte.user_id FROM (local_cte JOIN dist_cte ON ((dist_cte.user_id = local_cte.user_id)))
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DEBUG: generating subplan 37_1 for CTE local_cte: SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM subquery_and_ctes.users_table_local
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DEBUG: generating subplan 37_2 for CTE dist_cte: SELECT events_table.user_id FROM public.events_table, (SELECT DISTINCT users_table.value_2 FROM public.users_table OFFSET 0) foo WHERE ((events_table.user_id = foo.value_2) AND (events_table.user_id IN (SELECT DISTINCT users_table.value_1 FROM public.users_table ORDER BY users_table.value_1 LIMIT 3)))
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DEBUG: push down of limit count: 3
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DEBUG: generating subplan 38_1 for subquery SELECT DISTINCT value_1 FROM public.users_table ORDER BY value_1 LIMIT 3
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DEBUG: generating subplan 38_2 for subquery SELECT DISTINCT value_2 FROM public.users_table OFFSET 0
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DEBUG: push down of limit count: 5
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DEBUG: generating subplan 36_2 for subquery SELECT DISTINCT users_table.user_id FROM public.users_table, public.events_table WHERE ((users_table.user_id = events_table.user_id) AND (events_table.event_type = ANY (ARRAY[1, 2, 3, 4]))) ORDER BY users_table.user_id DESC LIMIT 5
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DEBUG: generating subplan 36_3 for subquery SELECT count(*) AS cnt FROM (SELECT intermediate_result.user_id FROM read_intermediate_result('36_1'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer)) cte, (SELECT intermediate_result.user_id FROM read_intermediate_result('36_2'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer)) foo WHERE (foo.user_id = cte.user_id)
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DEBUG: push down of limit count: 5
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cnt | user_id | time | value_1 | value_2 | value_3 | value_4
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-----+---------+---------------------------------+---------+---------+---------+---------
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432 | 1 | Thu Nov 23 17:30:34.635085 2017 | 3 | 4 | 4 |
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432 | 1 | Thu Nov 23 17:23:03.441394 2017 | 5 | 4 | 3 |
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432 | 3 | Thu Nov 23 17:18:51.048758 2017 | 1 | 5 | 5 |
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432 | 3 | Thu Nov 23 17:10:35.959913 2017 | 4 | 3 | 1 |
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432 | 5 | Thu Nov 23 16:48:32.08896 2017 | 5 | 2 | 1 |
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(5 rows)
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-- recursive CTES are not supported inside subqueries as well
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SELECT
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bar.user_id
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FROM
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(
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WITH RECURSIVE cte AS (
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SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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) SELECT * FROM cte ORDER BY 1 DESC
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) as foo,
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(
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SELECT
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DISTINCT users_table.user_id
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FROM
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users_table, events_table
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WHERE
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users_table.user_id = events_table.user_id AND
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event_type IN (1,2,3,4)
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) as bar
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WHERE foo.user_id = bar.user_id;
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ERROR: recursive CTEs are not supported in distributed queries
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SET client_min_messages TO DEFAULT;
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DROP SCHEMA subquery_and_ctes CASCADE;
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NOTICE: drop cascades to table users_table_local
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SET search_path TO public;
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