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LOAD 'pg_hint_plan';
ALTER SYSTEM SET session_preload_libraries TO 'pg_hint_plan';
SET pg_hint_plan.enable_hint TO on;
SET pg_hint_plan.debug_print TO on;
SET client_min_messages TO LOG;
-- Queries on ordinary tables with default setting
EXPLAIN (COSTS false) SELECT * FROM s1.t1;
QUERY PLAN
----------------
Seq Scan on t1
(1 row)
-- Note that parallel is not enforced on a single relation without
-- the GUCs related to parallelism reset.
/*+Parallel(t1 5 hard)*/
EXPLAIN (COSTS false) SELECT * FROM s1.t1;
LOG: pg_hint_plan:
used hint:
Parallel(t1 5 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
----------------
Seq Scan on t1
(1 row)
-- Still it works for multiple relations.
/*+Parallel(t11 5 hard)*/
EXPLAIN (COSTS false) SELECT * FROM s1.t1 as t11, s1.t1 as t12;
LOG: pg_hint_plan:
used hint:
Parallel(t11 5 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
-----------------------------------------
Nested Loop
-> Seq Scan on t1 t12
-> Gather
Workers Planned: 5
-> Parallel Seq Scan on t1 t11
(5 rows)
SET parallel_setup_cost to 0;
SET parallel_tuple_cost to 0;
SET min_parallel_table_scan_size to 0;
SET min_parallel_index_scan_size to 0;
SET max_parallel_workers_per_gather to DEFAULT;
/*+Parallel(t1 8)*/
EXPLAIN (COSTS false) SELECT * FROM s1.t1;
LOG: pg_hint_plan:
used hint:
Parallel(t1 8 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
-------------------------------
Gather
Workers Planned: 2
-> Parallel Seq Scan on t1
(3 rows)
/*+Parallel(t1 8 soft)*/
EXPLAIN (COSTS false) SELECT * FROM s1.t1;
LOG: pg_hint_plan:
used hint:
Parallel(t1 8 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
-------------------------------
Gather
Workers Planned: 2
-> Parallel Seq Scan on t1
(3 rows)
/*+Parallel(t1 8 hard)*/
EXPLAIN (COSTS false) SELECT * FROM s1.t1;
LOG: pg_hint_plan:
used hint:
Parallel(t1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
-------------------------------
Gather
Workers Planned: 8
-> Parallel Seq Scan on t1
(3 rows)
/*+Parallel(t1 4 hard) */ /* to be gather merge*/
EXPLAIN (COSTS false) SELECT * FROM s1.t1 ORDER BY s1.t1.c1 LIMIT 4;
LOG: pg_hint_plan:
used hint:
Parallel(t1 4 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
---------------------------------------------------
Limit
-> Gather Merge
Workers Planned: 4
-> Parallel Index Scan using t1_i1 on t1
(4 rows)
-- Queries on inheritance tables
SET parallel_setup_cost to 0;
SET parallel_tuple_cost to 0;
SET min_parallel_table_scan_size to 0;
SET min_parallel_index_scan_size to 0;
SET enable_parallel_append to false;
/*+Parallel(p1 8)*/
EXPLAIN (COSTS false) SELECT * FROM p1;
LOG: pg_hint_plan:
used hint:
Parallel(p1 8 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------
Gather
Workers Planned: 1
-> Append
-> Parallel Seq Scan on p1 p1_1
-> Parallel Seq Scan on p1_c1 p1_2
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
(12 rows)
SET enable_parallel_append to true;
/*+Parallel(p1 8)*/
EXPLAIN (COSTS false) SELECT * FROM p1;
LOG: pg_hint_plan:
used hint:
Parallel(p1 8 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------
Gather
Workers Planned: 2
-> Parallel Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
(12 rows)
SET parallel_setup_cost to DEFAULT;
SET parallel_tuple_cost to DEFAULT;
SET min_parallel_table_scan_size to DEFAULT;
SET min_parallel_index_scan_size to DEFAULT;
SET enable_parallel_append to false;
/*+Parallel(p1 8 hard)*/
EXPLAIN (COSTS false) SELECT * FROM p1;
LOG: pg_hint_plan:
used hint:
Parallel(p1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------
Gather
Workers Planned: 8
-> Append
-> Parallel Seq Scan on p1 p1_1
-> Parallel Seq Scan on p1_c1 p1_2
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
(12 rows)
SET enable_parallel_append to true;
/*+Parallel(p1 8 hard)*/
EXPLAIN (COSTS false) SELECT * FROM p1;
LOG: pg_hint_plan:
used hint:
Parallel(p1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
(12 rows)
-- hinting on children doesn't work (changed as of pg_hint_plan 10)
SET enable_parallel_append to false;
/*+Parallel(p1_c1 8 hard)*/
EXPLAIN (COSTS false) SELECT * FROM p1;
LOG: pg_hint_plan:
used hint:
Parallel(p1_c1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
---------------------------------
Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c2 p1_3
-> Seq Scan on p1_c3 p1_4
-> Seq Scan on p1_c4 p1_5
-> Seq Scan on p1_c1_c1 p1_6
-> Seq Scan on p1_c1_c2 p1_7
-> Seq Scan on p1_c3_c1 p1_8
-> Seq Scan on p1_c3_c2 p1_9
(10 rows)
SET enable_parallel_append to true;
/*+Parallel(p1_c1 8 hard)*/
EXPLAIN (COSTS false) SELECT * FROM p1;
LOG: pg_hint_plan:
used hint:
Parallel(p1_c1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
---------------------------------
Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c2 p1_3
-> Seq Scan on p1_c3 p1_4
-> Seq Scan on p1_c4 p1_5
-> Seq Scan on p1_c1_c1 p1_6
-> Seq Scan on p1_c1_c2 p1_7
-> Seq Scan on p1_c3_c1 p1_8
-> Seq Scan on p1_c3_c2 p1_9
(10 rows)
-- Joins
EXPLAIN (COSTS false) SELECT * FROM p1_c1_c1 join p2_c1_c1 on p1_c1_c1.id = p2_c1_c1.id;
QUERY PLAN
------------------------------------------
Hash Join
Hash Cond: (p1_c1_c1.id = p2_c1_c1.id)
-> Seq Scan on p1_c1_c1
-> Hash
-> Seq Scan on p2_c1_c1
(5 rows)
/*+Parallel(p1_c1_c1 8 hard)*/
EXPLAIN (COSTS false) SELECT * FROM p1_c1_c1 join p2_c1_c1 on p1_c1_c1.id = p2_c1_c1.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1_c1_c1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
-------------------------------------------------
Hash Join
Hash Cond: (p2_c1_c1.id = p1_c1_c1.id)
-> Seq Scan on p2_c1_c1
-> Hash
-> Gather
Workers Planned: 8
-> Parallel Seq Scan on p1_c1_c1
(7 rows)
SET parallel_setup_cost to 0;
SET parallel_tuple_cost to 0;
SET min_parallel_table_scan_size to 0;
SET min_parallel_index_scan_size to 0;
/*+Parallel(p1_c1_c1 8 soft) Parallel(p2_c1_c1 0)*/
EXPLAIN (COSTS false) SELECT * FROM p1_c1_c1 join p2_c1_c1 on p1_c1_c1.id = p2_c1_c1.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1_c1_c1 8 soft)
Parallel(p2_c1_c1 0 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------
Gather
Workers Planned: 1
-> Hash Join
Hash Cond: (p1_c1_c1.id = p2_c1_c1.id)
-> Parallel Seq Scan on p1_c1_c1
-> Hash
-> Seq Scan on p2_c1_c1
(7 rows)
/*+Parallel(p1_c1_c1 8 hard) Parallel(p2_c1_c1 0)*/
EXPLAIN (COSTS false) SELECT * FROM p1_c1_c1 join p2_c1_c1 on p1_c1_c1.id = p2_c1_c1.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1_c1_c1 8 hard)
Parallel(p2_c1_c1 0 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------
Gather
Workers Planned: 8
-> Hash Join
Hash Cond: (p1_c1_c1.id = p2_c1_c1.id)
-> Parallel Seq Scan on p1_c1_c1
-> Hash
-> Seq Scan on p2_c1_c1
(7 rows)
/*+Parallel(p1_c1_c1 8 hard) Parallel(p2_c1_c1 8 hard)*/
EXPLAIN (COSTS false) SELECT * FROM p1_c1_c1 join p2_c1_c1 on p1_c1_c1.id = p2_c1_c1.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1_c1_c1 8 hard)
Parallel(p2_c1_c1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
-------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Hash Join
Hash Cond: (p1_c1_c1.id = p2_c1_c1.id)
-> Parallel Seq Scan on p1_c1_c1
-> Parallel Hash
-> Parallel Seq Scan on p2_c1_c1
(7 rows)
-- Joins on inheritance tables
SET parallel_setup_cost to 0;
SET parallel_tuple_cost to 0;
SET min_parallel_table_scan_size to 0;
SET min_parallel_index_scan_size to 0;
SET enable_parallel_append to false;
/*+Parallel(p1 8)*/
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1 8 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------------
Gather
Workers Planned: 1
-> Parallel Hash Join
Hash Cond: (p1.id = p2.id)
-> Append
-> Parallel Seq Scan on p1 p1_1
-> Parallel Seq Scan on p1_c1 p1_2
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
-> Parallel Hash
-> Append
-> Parallel Seq Scan on p2 p2_1
-> Parallel Seq Scan on p2_c1 p2_2
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
(25 rows)
SET enable_parallel_append to true;
/*+Parallel(p1 8)*/
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1 8 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------------
Gather
Workers Planned: 2
-> Parallel Hash Join
Hash Cond: (p1.id = p2.id)
-> Parallel Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
-> Parallel Hash
-> Parallel Append
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
(25 rows)
SET enable_parallel_append to false;
/*+Parallel(p1 8)Parallel(p2 0)*/
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1 8 soft)
Parallel(p2 0 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------
Gather
Workers Planned: 1
-> Hash Join
Hash Cond: (p1.id = p2.id)
-> Append
-> Parallel Seq Scan on p1 p1_1
-> Parallel Seq Scan on p1_c1 p1_2
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
-> Hash
-> Append
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c2 p2_3
-> Seq Scan on p2_c3 p2_4
-> Seq Scan on p2_c4 p2_5
-> Seq Scan on p2_c1_c1 p2_6
-> Seq Scan on p2_c1_c2 p2_7
-> Seq Scan on p2_c3_c1 p2_8
-> Seq Scan on p2_c3_c2 p2_9
(25 rows)
SET enable_parallel_append to true;
/*+Parallel(p1 8)Parallel(p2 0)*/
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1 8 soft)
Parallel(p2 0 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------
Gather
Workers Planned: 2
-> Parallel Hash Join
Hash Cond: (p1.id = p2.id)
-> Parallel Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
-> Parallel Hash
-> Parallel Append
-> Seq Scan on p2_c2 p2_3
-> Seq Scan on p2_c4 p2_5
-> Seq Scan on p2_c1_c1 p2_6
-> Seq Scan on p2_c1_c2 p2_7
-> Seq Scan on p2_c3_c1 p2_8
-> Seq Scan on p2_c3_c2 p2_9
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c3 p2_4
(25 rows)
SET parallel_setup_cost to DEFAULT;
SET parallel_tuple_cost to DEFAULT;
SET min_parallel_table_scan_size to DEFAULT;
SET min_parallel_index_scan_size to DEFAULT;
/*+Parallel(p2 8 soft)*/
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
Parallel(p2 8 soft)
not used hint:
duplication hint:
error hint:
QUERY PLAN
---------------------------------------------
Hash Join
Hash Cond: (p1.id = p2.id)
-> Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c2 p1_3
-> Seq Scan on p1_c3 p1_4
-> Seq Scan on p1_c4 p1_5
-> Seq Scan on p1_c1_c1 p1_6
-> Seq Scan on p1_c1_c2 p1_7
-> Seq Scan on p1_c3_c1 p1_8
-> Seq Scan on p1_c3_c2 p1_9
-> Hash
-> Append
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c2 p2_3
-> Seq Scan on p2_c3 p2_4
-> Seq Scan on p2_c4 p2_5
-> Seq Scan on p2_c1_c1 p2_6
-> Seq Scan on p2_c1_c2 p2_7
-> Seq Scan on p2_c3_c1 p2_8
-> Seq Scan on p2_c3_c2 p2_9
(23 rows)
/*+Parallel(p2 8 hard)*/
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
Parallel(p2 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Hash Join
Hash Cond: (p2.id = p1.id)
-> Parallel Append
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
-> Parallel Hash
-> Parallel Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
(25 rows)
-- Number of workers results to the largest number
SET enable_parallel_append to false;
/*+Parallel(p2 8 hard) Parallel(p1 5 hard) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1 5 hard)
Parallel(p2 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Hash Join
Hash Cond: (p1.id = p2.id)
-> Append
-> Parallel Seq Scan on p1 p1_1
-> Parallel Seq Scan on p1_c1 p1_2
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
-> Parallel Hash
-> Append
-> Parallel Seq Scan on p2 p2_1
-> Parallel Seq Scan on p2_c1 p2_2
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
(25 rows)
SET enable_parallel_append to true;
/*+Parallel(p2 8 hard) Parallel(p1 5 hard) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
Parallel(p1 5 hard)
Parallel(p2 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Hash Join
Hash Cond: (p2.id = p1.id)
-> Parallel Append
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
-> Parallel Hash
-> Parallel Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
(25 rows)
-- Mixture with scan hints
-- p1 can be parallel
SET enable_parallel_append to false;
/*+Parallel(p1 8 hard) IndexScan(p2) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
IndexScan(p2)
Parallel(p1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
-------------------------------------------------------------------
Hash Join
Hash Cond: (p2.id = p1.id)
-> Append
-> Index Scan using p2_id2_val on p2 p2_1
-> Index Scan using p2_c1_id2_val on p2_c1 p2_2
-> Index Scan using p2_c2_id2_val on p2_c2 p2_3
-> Index Scan using p2_c3_id_val_idx on p2_c3 p2_4
-> Index Scan using p2_c4_id_val_idx on p2_c4 p2_5
-> Index Scan using p2_c1_c1_id_val_idx on p2_c1_c1 p2_6
-> Index Scan using p2_c1_c2_id_val_idx on p2_c1_c2 p2_7
-> Index Scan using p2_c3_c1_id_val_idx on p2_c3_c1 p2_8
-> Index Scan using p2_c3_c2_id_val_idx on p2_c3_c2 p2_9
-> Hash
-> Gather
Workers Planned: 8
-> Append
-> Parallel Seq Scan on p1 p1_1
-> Parallel Seq Scan on p1_c1 p1_2
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
(25 rows)
SET enable_parallel_append to true;
/*+Parallel(p1 8 hard) IndexScan(p2) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
IndexScan(p2)
Parallel(p1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
-------------------------------------------------------------------
Hash Join
Hash Cond: (p2.id = p1.id)
-> Append
-> Index Scan using p2_id2_val on p2 p2_1
-> Index Scan using p2_c1_id2_val on p2_c1 p2_2
-> Index Scan using p2_c2_id2_val on p2_c2 p2_3
-> Index Scan using p2_c3_id_val_idx on p2_c3 p2_4
-> Index Scan using p2_c4_id_val_idx on p2_c4 p2_5
-> Index Scan using p2_c1_c1_id_val_idx on p2_c1_c1 p2_6
-> Index Scan using p2_c1_c2_id_val_idx on p2_c1_c2 p2_7
-> Index Scan using p2_c3_c1_id_val_idx on p2_c3_c1 p2_8
-> Index Scan using p2_c3_c2_id_val_idx on p2_c3_c2 p2_9
-> Hash
-> Gather
Workers Planned: 8
-> Parallel Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
(25 rows)
-- Parallel sequential scan
SET enable_parallel_append to false;
/*+Parallel(p1 8 hard) SeqScan(p1) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
SeqScan(p1)
Parallel(p1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Hash Join
Hash Cond: (p1.id = p2.id)
-> Append
-> Parallel Seq Scan on p1 p1_1
-> Parallel Seq Scan on p1_c1 p1_2
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
-> Parallel Hash
-> Append
-> Parallel Seq Scan on p2 p2_1
-> Parallel Seq Scan on p2_c1 p2_2
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
(25 rows)
SET enable_parallel_append to true;
/*+Parallel(p1 8 hard) SeqScan(p1) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
SeqScan(p1)
Parallel(p1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
------------------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Hash Join
Hash Cond: (p1.id = p2.id)
-> Parallel Append
-> Seq Scan on p1 p1_1
-> Seq Scan on p1_c1 p1_2
-> Seq Scan on p1_c3 p1_4
-> Parallel Seq Scan on p1_c2 p1_3
-> Parallel Seq Scan on p1_c4 p1_5
-> Parallel Seq Scan on p1_c1_c1 p1_6
-> Parallel Seq Scan on p1_c1_c2 p1_7
-> Parallel Seq Scan on p1_c3_c1 p1_8
-> Parallel Seq Scan on p1_c3_c2 p1_9
-> Parallel Hash
-> Parallel Append
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
(25 rows)
-- Parallel index scan
SET enable_parallel_append to false;
/*+Parallel(p1 8 hard) IndexScan(p1) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
IndexScan(p1)
Parallel(p1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
----------------------------------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Hash Join
Hash Cond: (p1.id = p2.id)
-> Append
-> Parallel Index Scan using p1_pkey on p1 p1_1
-> Parallel Index Scan using p1_c1_pkey on p1_c1 p1_2
-> Parallel Index Scan using p1_c2_pkey on p1_c2 p1_3
-> Parallel Index Scan using p1_c3_pkey on p1_c3 p1_4
-> Parallel Index Scan using p1_c4_pkey on p1_c4 p1_5
-> Parallel Index Scan using p1_c1_c1_pkey on p1_c1_c1 p1_6
-> Parallel Index Scan using p1_c1_c2_pkey on p1_c1_c2 p1_7
-> Parallel Index Scan using p1_c3_c1_pkey on p1_c3_c1 p1_8
-> Parallel Index Scan using p1_c3_c2_pkey on p1_c3_c2 p1_9
-> Parallel Hash
-> Append
-> Parallel Seq Scan on p2 p2_1
-> Parallel Seq Scan on p2_c1 p2_2
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
(25 rows)
SET enable_parallel_append to true;
/*+Parallel(p1 8 hard) IndexScan(p1) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
IndexScan(p1)
Parallel(p1 8 hard)
not used hint:
duplication hint:
error hint:
QUERY PLAN
----------------------------------------------------------------------------
Gather
Workers Planned: 8
-> Parallel Hash Join
Hash Cond: (p1.id = p2.id)
-> Parallel Append
-> Parallel Index Scan using p1_pkey on p1 p1_1
-> Parallel Index Scan using p1_c1_pkey on p1_c1 p1_2
-> Parallel Index Scan using p1_c2_pkey on p1_c2 p1_3
-> Parallel Index Scan using p1_c3_pkey on p1_c3 p1_4
-> Parallel Index Scan using p1_c4_pkey on p1_c4 p1_5
-> Parallel Index Scan using p1_c1_c1_pkey on p1_c1_c1 p1_6
-> Parallel Index Scan using p1_c1_c2_pkey on p1_c1_c2 p1_7
-> Parallel Index Scan using p1_c3_c1_pkey on p1_c3_c1 p1_8
-> Parallel Index Scan using p1_c3_c2_pkey on p1_c3_c2 p1_9
-> Parallel Hash
-> Parallel Append
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c3 p2_4
-> Parallel Seq Scan on p2_c2 p2_3
-> Parallel Seq Scan on p2_c4 p2_5
-> Parallel Seq Scan on p2_c1_c1 p2_6
-> Parallel Seq Scan on p2_c1_c2 p2_7
-> Parallel Seq Scan on p2_c3_c1 p2_8
-> Parallel Seq Scan on p2_c3_c2 p2_9
(25 rows)
-- This hint doesn't turn on parallel, so the Parallel hint is ignored
set max_parallel_workers_per_gather TO 0;
/*+Parallel(p1 0 hard) IndexScan(p1) */
EXPLAIN (COSTS false) SELECT * FROM p1 join p2 on p1.id = p2.id;
LOG: pg_hint_plan:
used hint:
IndexScan(p1)
not used hint:
Parallel(p1 0 hard)
duplication hint:
error hint:
QUERY PLAN
-------------------------------------------------------------
Hash Join
Hash Cond: (p1.id = p2.id)
-> Append
-> Index Scan using p1_pkey on p1 p1_1
-> Index Scan using p1_c1_pkey on p1_c1 p1_2
-> Index Scan using p1_c2_pkey on p1_c2 p1_3
-> Index Scan using p1_c3_pkey on p1_c3 p1_4
-> Index Scan using p1_c4_pkey on p1_c4 p1_5
-> Index Scan using p1_c1_c1_pkey on p1_c1_c1 p1_6
-> Index Scan using p1_c1_c2_pkey on p1_c1_c2 p1_7
-> Index Scan using p1_c3_c1_pkey on p1_c3_c1 p1_8
-> Index Scan using p1_c3_c2_pkey on p1_c3_c2 p1_9
-> Hash
-> Append
-> Seq Scan on p2 p2_1
-> Seq Scan on p2_c1 p2_2
-> Seq Scan on p2_c2 p2_3
-> Seq Scan on p2_c3 p2_4
-> Seq Scan on p2_c4 p2_5
-> Seq Scan on p2_c1_c1 p2_6
-> Seq Scan on p2_c1_c2 p2_7
-> Seq Scan on p2_c3_c1 p2_8
-> Seq Scan on p2_c3_c2 p2_9
(23 rows)
-- Parallel on UNION
EXPLAIN (COSTS false) SELECT id FROM p1 UNION ALL SELECT id FROM p2;
QUERY PLAN
---------------------------------
Append
-> Seq Scan on p1
-> Seq Scan on p1_c1 p1_1
-> Seq Scan on p1_c2 p1_2
-> Seq Scan on p1_c3 p1_3
-> Seq Scan on p1_c4 p1_4
-> Seq Scan on p1_c1_c1 p1_5
-> Seq Scan on p1_c1_c2 p1_6
-> Seq Scan on p1_c3_c1 p1_7
-> Seq Scan on p1_c3_c2 p1_8
-> Seq Scan on p2
-> Seq Scan on p2_c1 p2_1
-> Seq Scan on p2_c2 p2_2
-> Seq Scan on p2_c3 p2_3