mirror of https://github.com/citusdata/citus.git
PG17 compatibility: fix plan diffs in multi_explain (#7780)
Regress test `multi_explain` has two queries that have a different query plan with PG17. Here is part of the plan diff for the query labelled _Union and left join subquery pushdown_ in `multi_explain.sql` (for the complete diff, search for `multi_explain` [here](https://github.com/citusdata/citus/actions/runs/12158205599/attempts/1)): ``` -> Sort Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone, events.event_time - -> Hash Left Join - Hash Cond: (users.composite_id = subquery_2.composite_id) - -> HashAggregate - Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time + -> Nested Loop Left Join + Join Filter: (users.composite_id = subquery_2.composite_id) + -> Unique + -> Sort + Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time -> Append ``` The change is the same in both queries; a hash left join with subquery_1 on the outer and subquery_2 on the inner side of the join is now a nested loop left join with subquery_1 on the outer and subquery_2 on the inner; additionally, the chosen method of uniquifying the UNION in subquery_1 has changed from hashed grouping to sort followed by unique, as shown in the diff above. The PG17 commit that caused this plan change is likely _[Fix MergeAppend to more accurately compute the number of rows that need to be sorted](https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=9d1a5354f)_ because it impacts the estimated rows counts of UNION paths. Comparing a costed plan of the query between PG16 and PG17 I noticed that with PG16 the rows estimate for the UNION in subquery_1 is 4, whereas with PG17 the rows estimate is 2. A lower rows estimate in the outer side of the join may result in nested loop looking cheaper than hash join for the left outer join, hence the plan change in the two queries where there is a UNION on the outer side of a left outer join. The proposed fix achieves a consistent plan across all supported postgres versions by temporarily disabling nested loop join and sort for the two impacted queries; the postgres optimizer selects hash join for the outer left join and hashed aggregation for the UNION operation. I investigated tweaking the queries, but was not able to arrive at a consistent plan, and I believe the SQL operator (e.g. join, group by, union) implementations are orthogonal to the intent of the test, so this should be a satisfactory solution, particularly as it avoids introducing a second alternative output file for `multi_explain`.pull/7922/head
Colm
naisila
parent
592416250c
commit
c3d21b807a
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@ -671,6 +671,15 @@ Aggregate
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-> Hash
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-> Hash
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-> Seq Scan on events_1400285 events
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-> Seq Scan on events_1400285 events
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Filter: ((event_type)::text = ANY ('{click,submit,pay}'::text[]))
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Filter: ((event_type)::text = ANY ('{click,submit,pay}'::text[]))
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SELECT success FROM run_command_on_workers('alter system set enable_nestloop to off');
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t
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t
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SELECT success FROM run_command_on_workers('alter system set enable_sort to off');
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t
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t
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SELECT success FROM run_command_on_workers('select pg_reload_conf()');
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t
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t
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-- Union and left join subquery pushdown
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-- Union and left join subquery pushdown
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EXPLAIN (COSTS OFF)
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EXPLAIN (COSTS OFF)
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SELECT
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SELECT
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@ -741,41 +750,38 @@ HashAggregate
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Tasks Shown: One of 4
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Tasks Shown: One of 4
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-> Task
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-> Task
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Node: host=localhost port=xxxxx dbname=regression
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Node: host=localhost port=xxxxx dbname=regression
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-> GroupAggregate
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-> HashAggregate
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Group Key: subquery_top.hasdone
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Group Key: COALESCE(subquery_2.hasdone, 'Has not done paying'::text)
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-> Sort
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-> GroupAggregate
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Sort Key: subquery_top.hasdone
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone
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-> Subquery Scan on subquery_top
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-> Sort
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-> GroupAggregate
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Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone, events.event_time
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone
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-> Hash Left Join
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-> Sort
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Hash Cond: (users.composite_id = subquery_2.composite_id)
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Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone, events.event_time
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-> HashAggregate
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-> Hash Left Join
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time
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Hash Cond: (users.composite_id = subquery_2.composite_id)
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-> Append
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-> HashAggregate
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-> Hash Join
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time
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Hash Cond: (users.composite_id = events.composite_id)
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-> Append
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-> Seq Scan on users_1400289 users
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-> Hash Join
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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Hash Cond: (users.composite_id = events.composite_id)
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-> Hash
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-> Seq Scan on users_1400289 users
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-> Seq Scan on events_1400285 events
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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Filter: ((event_type)::text = 'click'::text)
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-> Hash
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-> Hash Join
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-> Seq Scan on events_1400285 events
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Hash Cond: (users_1.composite_id = events_1.composite_id)
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Filter: ((event_type)::text = 'click'::text)
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-> Seq Scan on users_1400289 users_1
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-> Hash Join
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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Hash Cond: (users_1.composite_id = events_1.composite_id)
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-> Hash
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-> Seq Scan on users_1400289 users_1
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-> Seq Scan on events_1400285 events_1
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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Filter: ((event_type)::text = 'submit'::text)
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-> Hash
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-> Hash
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-> Seq Scan on events_1400285 events_1
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-> Subquery Scan on subquery_2
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Filter: ((event_type)::text = 'submit'::text)
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-> Unique
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-> Hash
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-> Sort
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-> Subquery Scan on subquery_2
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Sort Key: ((events_2.composite_id).tenant_id), ((events_2.composite_id).user_id)
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-> Unique
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-> Seq Scan on events_1400285 events_2
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-> Sort
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type) AND ((event_type)::text = 'pay'::text))
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Sort Key: ((events_2.composite_id).tenant_id), ((events_2.composite_id).user_id)
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-> Seq Scan on events_1400285 events_2
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type) AND ((event_type)::text = 'pay'::text))
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-- Union, left join and having subquery pushdown
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-- Union, left join and having subquery pushdown
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EXPLAIN (COSTS OFF)
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EXPLAIN (COSTS OFF)
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SELECT
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SELECT
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@ -856,44 +862,48 @@ Sort
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Tasks Shown: One of 4
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Tasks Shown: One of 4
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-> Task
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-> Task
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Node: host=localhost port=xxxxx dbname=regression
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Node: host=localhost port=xxxxx dbname=regression
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-> GroupAggregate
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-> HashAggregate
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Group Key: subquery_top.count_pay
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Group Key: COALESCE(subquery_2.count_pay, '0'::bigint)
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-> Sort
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-> GroupAggregate
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Sort Key: subquery_top.count_pay
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.count_pay
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-> Subquery Scan on subquery_top
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Filter: (array_ndims(array_agg(('action=>1'::text) ORDER BY events.event_time)) > 0)
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-> GroupAggregate
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-> Sort
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.count_pay
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Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.count_pay, events.event_time
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Filter: (array_ndims(array_agg(('action=>1'::text) ORDER BY events.event_time)) > 0)
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-> Hash Left Join
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-> Sort
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Hash Cond: (users.composite_id = subquery_2.composite_id)
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Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.count_pay, events.event_time
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-> HashAggregate
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-> Hash Left Join
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time
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Hash Cond: (users.composite_id = subquery_2.composite_id)
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-> Append
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-> Hash Join
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Hash Cond: (users.composite_id = events.composite_id)
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-> Seq Scan on users_1400289 users
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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-> Hash
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-> Seq Scan on events_1400285 events
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Filter: ((event_type)::text = 'click'::text)
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-> Hash Join
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Hash Cond: (users_1.composite_id = events_1.composite_id)
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-> Seq Scan on users_1400289 users_1
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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-> Hash
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-> Seq Scan on events_1400285 events_1
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Filter: ((event_type)::text = 'submit'::text)
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-> Hash
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-> Subquery Scan on subquery_2
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-> HashAggregate
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-> HashAggregate
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time
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Group Key: events_2.composite_id
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-> Append
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Filter: (count(*) > 2)
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-> Hash Join
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-> Seq Scan on events_1400285 events_2
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Hash Cond: (users.composite_id = events.composite_id)
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type) AND ((event_type)::text = 'pay'::text))
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-> Seq Scan on users_1400289 users
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SELECT success FROM run_command_on_workers('alter system reset enable_nestloop');
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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t
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-> Hash
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t
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-> Seq Scan on events_1400285 events
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SELECT success FROM run_command_on_workers('alter system reset enable_sort');
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Filter: ((event_type)::text = 'click'::text)
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t
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-> Hash Join
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t
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Hash Cond: (users_1.composite_id = events_1.composite_id)
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SELECT success FROM run_command_on_workers('select pg_reload_conf()');
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-> Seq Scan on users_1400289 users_1
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t
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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t
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-> Hash
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-> Seq Scan on events_1400285 events_1
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Filter: ((event_type)::text = 'submit'::text)
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-> Hash
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-> Subquery Scan on subquery_2
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-> GroupAggregate
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Group Key: events_2.composite_id
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Filter: (count(*) > 2)
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-> Sort
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Sort Key: events_2.composite_id
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-> Seq Scan on events_1400285 events_2
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type) AND ((event_type)::text = 'pay'::text))
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-- Lateral join subquery pushdown
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-- Lateral join subquery pushdown
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-- set subquery_pushdown due to limit in the query
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-- set subquery_pushdown due to limit in the query
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SET citus.subquery_pushdown to ON;
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SET citus.subquery_pushdown to ON;
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@ -671,6 +671,15 @@ Aggregate
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-> Hash
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-> Hash
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-> Seq Scan on events_1400285 events
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-> Seq Scan on events_1400285 events
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Filter: ((event_type)::text = ANY ('{click,submit,pay}'::text[]))
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Filter: ((event_type)::text = ANY ('{click,submit,pay}'::text[]))
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SELECT success FROM run_command_on_workers('alter system set enable_nestloop to off');
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t
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SELECT success FROM run_command_on_workers('alter system set enable_sort to off');
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SELECT success FROM run_command_on_workers('select pg_reload_conf()');
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t
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-- Union and left join subquery pushdown
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-- Union and left join subquery pushdown
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EXPLAIN (COSTS OFF)
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EXPLAIN (COSTS OFF)
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SELECT
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SELECT
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@ -741,41 +750,38 @@ HashAggregate
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Tasks Shown: One of 4
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Tasks Shown: One of 4
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-> Task
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-> Task
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Node: host=localhost port=xxxxx dbname=regression
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Node: host=localhost port=xxxxx dbname=regression
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-> GroupAggregate
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-> HashAggregate
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Group Key: subquery_top.hasdone
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Group Key: COALESCE(subquery_2.hasdone, 'Has not done paying'::text)
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-> Sort
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-> GroupAggregate
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Sort Key: subquery_top.hasdone
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone
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-> Subquery Scan on subquery_top
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-> Sort
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-> GroupAggregate
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Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone
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-> Hash Left Join
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-> Sort
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Hash Cond: (users.composite_id = subquery_2.composite_id)
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Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.hasdone
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-> HashAggregate
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-> Hash Left Join
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time
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Hash Cond: (users.composite_id = subquery_2.composite_id)
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-> Append
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-> HashAggregate
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-> Hash Join
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time
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Hash Cond: (users.composite_id = events.composite_id)
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-> Append
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-> Seq Scan on users_1400289 users
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-> Hash Join
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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Hash Cond: (users.composite_id = events.composite_id)
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-> Hash
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-> Seq Scan on users_1400289 users
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-> Seq Scan on events_1400285 events
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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Filter: ((event_type)::text = 'click'::text)
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-> Hash
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-> Hash Join
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-> Seq Scan on events_1400285 events
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Hash Cond: (users_1.composite_id = events_1.composite_id)
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Filter: ((event_type)::text = 'click'::text)
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-> Seq Scan on users_1400289 users_1
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-> Hash Join
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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Hash Cond: (users_1.composite_id = events_1.composite_id)
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-> Hash
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-> Seq Scan on users_1400289 users_1
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-> Seq Scan on events_1400285 events_1
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
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Filter: ((event_type)::text = 'submit'::text)
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-> Hash
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-> Hash
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-> Seq Scan on events_1400285 events_1
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-> Subquery Scan on subquery_2
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Filter: ((event_type)::text = 'submit'::text)
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-> Unique
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-> Hash
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-> Sort
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-> Subquery Scan on subquery_2
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Sort Key: ((events_2.composite_id).tenant_id), ((events_2.composite_id).user_id)
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-> Unique
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-> Seq Scan on events_1400285 events_2
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-> Sort
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type) AND ((event_type)::text = 'pay'::text))
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Sort Key: ((events_2.composite_id).tenant_id), ((events_2.composite_id).user_id)
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-> Seq Scan on events_1400285 events_2
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Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type) AND ((event_type)::text = 'pay'::text))
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-- Union, left join and having subquery pushdown
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-- Union, left join and having subquery pushdown
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EXPLAIN (COSTS OFF)
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EXPLAIN (COSTS OFF)
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SELECT
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SELECT
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Tasks Shown: One of 4
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Tasks Shown: One of 4
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-> Task
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-> Task
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Node: host=localhost port=xxxxx dbname=regression
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Node: host=localhost port=xxxxx dbname=regression
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-> GroupAggregate
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-> HashAggregate
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Group Key: subquery_top.count_pay
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Group Key: COALESCE(subquery_2.count_pay, '0'::bigint)
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-> Sort
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-> GroupAggregate
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Sort Key: subquery_top.count_pay
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.count_pay
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-> Subquery Scan on subquery_top
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Filter: (array_ndims(array_agg(('action=>1'::text) ORDER BY events.event_time)) > 0)
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-> GroupAggregate
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-> Sort
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Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.count_pay
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Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.count_pay
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Filter: (array_ndims(array_agg(('action=>1'::text) ORDER BY events.event_time)) > 0)
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-> Hash Left Join
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-> Sort
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Hash Cond: (users.composite_id = subquery_2.composite_id)
|
||||||
Sort Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), subquery_2.count_pay
|
-> HashAggregate
|
||||||
-> Hash Left Join
|
Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time
|
||||||
Hash Cond: (users.composite_id = subquery_2.composite_id)
|
-> Append
|
||||||
|
-> Hash Join
|
||||||
|
Hash Cond: (users.composite_id = events.composite_id)
|
||||||
|
-> Seq Scan on users_1400289 users
|
||||||
|
Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
|
||||||
|
-> Hash
|
||||||
|
-> Seq Scan on events_1400285 events
|
||||||
|
Filter: ((event_type)::text = 'click'::text)
|
||||||
|
-> Hash Join
|
||||||
|
Hash Cond: (users_1.composite_id = events_1.composite_id)
|
||||||
|
-> Seq Scan on users_1400289 users_1
|
||||||
|
Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
|
||||||
|
-> Hash
|
||||||
|
-> Seq Scan on events_1400285 events_1
|
||||||
|
Filter: ((event_type)::text = 'submit'::text)
|
||||||
|
-> Hash
|
||||||
|
-> Subquery Scan on subquery_2
|
||||||
-> HashAggregate
|
-> HashAggregate
|
||||||
Group Key: ((users.composite_id).tenant_id), ((users.composite_id).user_id), users.composite_id, ('action=>1'::text), events.event_time
|
Group Key: events_2.composite_id
|
||||||
-> Append
|
Filter: (count(*) > 2)
|
||||||
-> Hash Join
|
-> Seq Scan on events_1400285 events_2
|
||||||
Hash Cond: (users.composite_id = events.composite_id)
|
Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type) AND ((event_type)::text = 'pay'::text))
|
||||||
-> Seq Scan on users_1400289 users
|
SELECT success FROM run_command_on_workers('alter system reset enable_nestloop');
|
||||||
Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
|
t
|
||||||
-> Hash
|
t
|
||||||
-> Seq Scan on events_1400285 events
|
SELECT success FROM run_command_on_workers('alter system reset enable_sort');
|
||||||
Filter: ((event_type)::text = 'click'::text)
|
t
|
||||||
-> Hash Join
|
t
|
||||||
Hash Cond: (users_1.composite_id = events_1.composite_id)
|
SELECT success FROM run_command_on_workers('select pg_reload_conf()');
|
||||||
-> Seq Scan on users_1400289 users_1
|
t
|
||||||
Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type))
|
t
|
||||||
-> Hash
|
|
||||||
-> Seq Scan on events_1400285 events_1
|
|
||||||
Filter: ((event_type)::text = 'submit'::text)
|
|
||||||
-> Hash
|
|
||||||
-> Subquery Scan on subquery_2
|
|
||||||
-> GroupAggregate
|
|
||||||
Group Key: events_2.composite_id
|
|
||||||
Filter: (count(*) > 2)
|
|
||||||
-> Sort
|
|
||||||
Sort Key: events_2.composite_id
|
|
||||||
-> Seq Scan on events_1400285 events_2
|
|
||||||
Filter: ((composite_id >= '(1,-9223372036854775808)'::user_composite_type) AND (composite_id <= '(1,9223372036854775807)'::user_composite_type) AND ((event_type)::text = 'pay'::text))
|
|
||||||
-- Lateral join subquery pushdown
|
-- Lateral join subquery pushdown
|
||||||
-- set subquery_pushdown due to limit in the query
|
-- set subquery_pushdown due to limit in the query
|
||||||
SET citus.subquery_pushdown to ON;
|
SET citus.subquery_pushdown to ON;
|
||||||
|
|
|
||||||
|
|
@ -260,6 +260,10 @@ FROM
|
||||||
tenant_id,
|
tenant_id,
|
||||||
user_id) AS subquery;
|
user_id) AS subquery;
|
||||||
|
|
||||||
|
SELECT success FROM run_command_on_workers('alter system set enable_nestloop to off');
|
||||||
|
SELECT success FROM run_command_on_workers('alter system set enable_sort to off');
|
||||||
|
SELECT success FROM run_command_on_workers('select pg_reload_conf()');
|
||||||
|
|
||||||
-- Union and left join subquery pushdown
|
-- Union and left join subquery pushdown
|
||||||
EXPLAIN (COSTS OFF)
|
EXPLAIN (COSTS OFF)
|
||||||
SELECT
|
SELECT
|
||||||
|
|
@ -396,6 +400,10 @@ GROUP BY
|
||||||
ORDER BY
|
ORDER BY
|
||||||
count_pay;
|
count_pay;
|
||||||
|
|
||||||
|
SELECT success FROM run_command_on_workers('alter system reset enable_nestloop');
|
||||||
|
SELECT success FROM run_command_on_workers('alter system reset enable_sort');
|
||||||
|
SELECT success FROM run_command_on_workers('select pg_reload_conf()');
|
||||||
|
|
||||||
-- Lateral join subquery pushdown
|
-- Lateral join subquery pushdown
|
||||||
-- set subquery_pushdown due to limit in the query
|
-- set subquery_pushdown due to limit in the query
|
||||||
SET citus.subquery_pushdown to ON;
|
SET citus.subquery_pushdown to ON;
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue