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Merge pull request #2628 from citusdata/fix_infinite_recursion 

Some queries lead to infinite recursion during recursive planning
pull/2617/head
Önder Kalacı 2019-03-18 15:15:25 +01:00 committed by GitHub
parent 8787cb3199 ad5ff1d01a
commit 7914a039a7
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3 changed files with 226 additions and 0 deletions
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13
src/backend/distributed/planner/query_colocation_checker.c
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@ -25,6 +25,7 @@
#include "distributed/query_colocation_checker.h"
#include "distributed/pg_dist_partition.h"
#include "distributed/relation_restriction_equivalence.h"
#include "distributed/multi_logical_planner.h" /* only to access utility functions */
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "parser/parsetree.h"
@ -194,6 +195,18 @@ SubqueryColocated(Query *subquery, ColocatedJoinChecker *checker)
RelationRestrictionContext *unionedRelationRestrictionContext = NULL;
PlannerRestrictionContext *unionedPlannerRestrictionContext = NULL;
/*
* There are no relations in the input subquery, such as a subquery
* that consist of only intermediate results or without FROM
* clause.
*/
if (list_length(filteredRestrictionList) == 0)
{
Assert(!QueryContainsDistributedTableRTE(subquery));
return true;
}
/*
* We merge the relation restrictions of the input subquery and the anchor
* restrictions to form a temporary relation restriction context. The aim of

122
src/test/regress/expected/non_colocated_subquery_joins.out
View File

@ -916,6 +916,128 @@ DEBUG: Plan 97 query after replacing subqueries and CTEs: SELECT count(*) AS co
t
(1 row)
-- make sure to skip calling recursive planning over and over again
-- for already recursively planned subqueries
SET client_min_messages TO DEBUG2;
SELECT *
FROM
(SELECT *
FROM users_table
OFFSET 0) AS users_table
JOIN LATERAL
(SELECT *
FROM
(SELECT *
FROM events_table
WHERE user_id = users_table.user_id) AS bar
LEFT JOIN users_table u2 ON u2.user_id = bar.value_2) AS foo ON TRUE;
DEBUG: generating subplan 99_1 for subquery SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM public.users_table OFFSET 0
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
DEBUG: Plan 99 query after replacing subqueries and CTEs: SELECT users_table.user_id, users_table."time", users_table.value_1, users_table.value_2, users_table.value_3, users_table.value_4, foo.user_id, foo."time", foo.event_type, foo.value_2, foo.value_3, foo.value_4, foo.user_id_1 AS user_id, foo.time_1 AS "time", foo.value_1, foo.value_2_1 AS value_2, foo.value_3_1 AS value_3, foo.value_4_1 AS value_4 FROM ((SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.value_1, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('99_1'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, value_1 integer, value_2 integer, value_3 double precision, value_4 bigint)) users_table JOIN LATERAL (SELECT bar.user_id, bar."time", bar.event_type, bar.value_2, bar.value_3, bar.value_4, u2.user_id, u2."time", u2.value_1, u2.value_2, u2.value_3, u2.value_4 FROM ((SELECT events_table.user_id, events_table."time", events_table.event_type, events_table.value_2, events_table.value_3, events_table.value_4 FROM public.events_table WHERE (events_table.user_id OPERATOR(pg_catalog.=) users_table.user_id)) bar LEFT JOIN public.users_table u2 ON ((u2.user_id OPERATOR(pg_catalog.=) bar.value_2)))) foo(user_id, "time", event_type, value_2, value_3, value_4, user_id_1, time_1, value_1, value_2_1, value_3_1, value_4_1) ON (true))
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
ERROR: complex joins are only supported when all distributed tables are joined on their distribution columns with equal operator
-- similar to the above, make sure that we skip recursive plannig when
-- the subquery doesn't have any tables
SELECT true AS valid FROM explain_json_2($$
SELECT *
FROM
(SELECT 1 AS user_id) AS users_table
JOIN LATERAL
(SELECT *
FROM
(SELECT *
FROM events_table
WHERE user_id = users_table.user_id) AS bar
LEFT JOIN users_table u2 ON u2.user_id = bar.value_2) AS foo ON TRUE
$$);
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
DEBUG: skipping recursive planning for the subquery since it contains references to outer queries
ERROR: cannot perform distributed planning on this query
-- similar to the above, make sure that we skip recursive plannig when
-- the subquery contains only intermediate results
SELECT *
FROM
(
SELECT * FROM(
SELECT *
FROM users_table
EXCEPT
SELECT *
FROM users_table
WHERE value_1 > 2
) AS users_table_union
) AS users_table_limited
JOIN LATERAL
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM events_table WHERE value_3 > 4
INTERSECT
SELECT *
FROM events_table
WHERE value_2 > 2
) AS events_table
WHERE user_id = users_table_limited.user_id) AS bar
LEFT JOIN users_table u2 ON u2.user_id = bar.value_2) AS foo ON TRUE;
DEBUG: generating subplan 102_1 for subquery SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM public.users_table
DEBUG: generating subplan 102_2 for subquery SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM public.users_table WHERE (value_1 OPERATOR(pg_catalog.>) 2)
DEBUG: Creating router plan
DEBUG: Plan is router executable
DEBUG: generating subplan 102_3 for subquery SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.value_1, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('102_1'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, value_1 integer, value_2 integer, value_3 double precision, value_4 bigint) EXCEPT SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.value_1, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('102_2'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, value_1 integer, value_2 integer, value_3 double precision, value_4 bigint)
DEBUG: generating subplan 102_4 for subquery SELECT user_id, "time", event_type, value_2, value_3, value_4 FROM public.events_table WHERE (value_3 OPERATOR(pg_catalog.>) (4)::double precision)
DEBUG: generating subplan 102_5 for subquery SELECT user_id, "time", event_type, value_2, value_3, value_4 FROM public.events_table WHERE (value_2 OPERATOR(pg_catalog.>) 2)
DEBUG: Creating router plan
DEBUG: Plan is router executable
DEBUG: generating subplan 102_6 for subquery SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.event_type, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('102_4'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, event_type integer, value_2 integer, value_3 double precision, value_4 bigint) INTERSECT SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.event_type, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('102_5'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, event_type integer, value_2 integer, value_3 double precision, value_4 bigint)
DEBUG: Plan 102 query after replacing subqueries and CTEs: SELECT users_table_limited.user_id, users_table_limited."time", users_table_limited.value_1, users_table_limited.value_2, users_table_limited.value_3, users_table_limited.value_4, foo.user_id, foo."time", foo.event_type, foo.value_2, foo.value_3, foo.value_4, foo.user_id_1 AS user_id, foo.time_1 AS "time", foo.value_1, foo.value_2_1 AS value_2, foo.value_3_1 AS value_3, foo.value_4_1 AS value_4 FROM ((SELECT users_table_union.user_id, users_table_union."time", users_table_union.value_1, users_table_union.value_2, users_table_union.value_3, users_table_union.value_4 FROM (SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.value_1, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('102_3'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, value_1 integer, value_2 integer, value_3 double precision, value_4 bigint)) users_table_union) users_table_limited JOIN LATERAL (SELECT bar.user_id, bar."time", bar.event_type, bar.value_2, bar.value_3, bar.value_4, u2.user_id, u2."time", u2.value_1, u2.value_2, u2.value_3, u2.value_4 FROM ((SELECT events_table.user_id, events_table."time", events_table.event_type, events_table.value_2, events_table.value_3, events_table.value_4 FROM (SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.event_type, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('102_6'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, event_type integer, value_2 integer, value_3 double precision, value_4 bigint)) events_table WHERE (events_table.user_id OPERATOR(pg_catalog.=) users_table_limited.user_id)) bar LEFT JOIN public.users_table u2 ON ((u2.user_id OPERATOR(pg_catalog.=) bar.value_2)))) foo(user_id, "time", event_type, value_2, value_3, value_4, user_id_1, time_1, value_1, value_2_1, value_3_1, value_4_1) ON (true))
ERROR: cannot pushdown the subquery
-- similar to the above, but this time there are multiple
-- non-colocated subquery joins one of them contains lateral
-- join
SELECT count(*) FROM events_table WHERE user_id NOT IN
(
SELECT users_table_limited.user_id
FROM
(SELECT *
FROM users_table
EXCEPT
SELECT *
FROM users_table
WHERE value_1 > 2
) AS users_table_limited
JOIN LATERAL
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM events_table WHERE value_3 > 4
INTERSECT
SELECT *
FROM events_table
WHERE value_2 > 2
) AS events_table
WHERE user_id = users_table_limited.user_id) AS bar
LEFT JOIN users_table u2 ON u2.user_id = bar.value_2) AS foo ON TRUE
);
DEBUG: generating subplan 109_1 for subquery SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM public.users_table
DEBUG: generating subplan 109_2 for subquery SELECT user_id, "time", value_1, value_2, value_3, value_4 FROM public.users_table WHERE (value_1 OPERATOR(pg_catalog.>) 2)
DEBUG: Creating router plan
DEBUG: Plan is router executable
DEBUG: generating subplan 109_3 for subquery SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.value_1, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('109_1'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, value_1 integer, value_2 integer, value_3 double precision, value_4 bigint) EXCEPT SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.value_1, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('109_2'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, value_1 integer, value_2 integer, value_3 double precision, value_4 bigint)
DEBUG: generating subplan 109_4 for subquery SELECT user_id, "time", event_type, value_2, value_3, value_4 FROM public.events_table WHERE (value_3 OPERATOR(pg_catalog.>) (4)::double precision)
DEBUG: generating subplan 109_5 for subquery SELECT user_id, "time", event_type, value_2, value_3, value_4 FROM public.events_table WHERE (value_2 OPERATOR(pg_catalog.>) 2)
DEBUG: Creating router plan
DEBUG: Plan is router executable
DEBUG: generating subplan 109_6 for subquery SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.event_type, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('109_4'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, event_type integer, value_2 integer, value_3 double precision, value_4 bigint) INTERSECT SELECT intermediate_result.user_id, intermediate_result."time", intermediate_result.event_type, intermediate_result.value_2, intermediate_result.value_3, intermediate_result.value_4 FROM read_intermediate_result('109_5'::text, 'binary'::citus_copy_format) intermediate_result(user_id integer, "time" timestamp without time zone, event_type integer, value_2 integer, value_3 double precision, value_4 bigint)
ERROR: cannot pushdown the subquery
RESET client_min_messages;
DROP FUNCTION explain_json_2(text);
SET search_path TO 'public';

91
src/test/regress/sql/non_colocated_subquery_joins.sql
View File

@ -691,6 +691,97 @@ SELECT true AS valid FROM explain_json_2($$
AND foo.user_id = bar.value_2;
$$);
-- make sure to skip calling recursive planning over and over again
-- for already recursively planned subqueries
SET client_min_messages TO DEBUG2;
SELECT *
FROM
(SELECT *
FROM users_table
OFFSET 0) AS users_table
JOIN LATERAL
(SELECT *
FROM
(SELECT *
FROM events_table
WHERE user_id = users_table.user_id) AS bar
LEFT JOIN users_table u2 ON u2.user_id = bar.value_2) AS foo ON TRUE;
-- similar to the above, make sure that we skip recursive plannig when
-- the subquery doesn't have any tables
SELECT true AS valid FROM explain_json_2($$
SELECT *
FROM
(SELECT 1 AS user_id) AS users_table
JOIN LATERAL
(SELECT *
FROM
(SELECT *
FROM events_table
WHERE user_id = users_table.user_id) AS bar
LEFT JOIN users_table u2 ON u2.user_id = bar.value_2) AS foo ON TRUE
$$);
-- similar to the above, make sure that we skip recursive plannig when
-- the subquery contains only intermediate results
SELECT *
FROM
(
SELECT * FROM(
SELECT *
FROM users_table
EXCEPT
SELECT *
FROM users_table
WHERE value_1 > 2
) AS users_table_union
) AS users_table_limited
JOIN LATERAL
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM events_table WHERE value_3 > 4
INTERSECT
SELECT *
FROM events_table
WHERE value_2 > 2
) AS events_table
WHERE user_id = users_table_limited.user_id) AS bar
LEFT JOIN users_table u2 ON u2.user_id = bar.value_2) AS foo ON TRUE;
-- similar to the above, but this time there are multiple
-- non-colocated subquery joins one of them contains lateral
-- join
SELECT count(*) FROM events_table WHERE user_id NOT IN
(
SELECT users_table_limited.user_id
FROM
(SELECT *
FROM users_table
EXCEPT
SELECT *
FROM users_table
WHERE value_1 > 2
) AS users_table_limited
JOIN LATERAL
(SELECT *
FROM
(SELECT *
FROM
(SELECT *
FROM events_table WHERE value_3 > 4
INTERSECT
SELECT *
FROM events_table
WHERE value_2 > 2
) AS events_table
WHERE user_id = users_table_limited.user_id) AS bar
LEFT JOIN users_table u2 ON u2.user_id = bar.value_2) AS foo ON TRUE
);
RESET client_min_messages;
DROP FUNCTION explain_json_2(text);