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Forbid parallel Hash Right Join or Hash Full Join

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This commit is contained in:
wuyuechuan
2020-10-21 17:16:11 +08:00
parent f0c9d88846
commit 63050411fb
3 changed files with 52 additions and 26 deletions
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3
src/gausskernel/optimizer/path/joinpath.cpp
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@ -1805,7 +1805,8 @@ static void hash_inner_and_outer(PlannerInfo* root, RelOptInfo* joinrel, RelOptI
* able to properly guarantee uniqueness. Also, the resulting path
* must not be parameterized.
*/
if (joinrel->consider_parallel && jointype != JOIN_UNIQUE_OUTER && outerrel->partial_pathlist != NIL) {
if (joinrel->consider_parallel && jointype != JOIN_UNIQUE_OUTER && jointype != JOIN_FULL &&
jointype != JOIN_RIGHT && outerrel->partial_pathlist != NIL) {
Path* cheapest_partial_outer;
Path* cheapest_safe_inner = NULL;

28
src/test/regress/expected/parallel_hashjoin.out
View File

@ -29,12 +29,10 @@ select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b
9 | 9
(9 rows)
set parallel_setup_cost = 1;
set min_parallel_table_scan_size=0;
set parallel_tuple_cost = 0.01;
set enable_nestloop=off;
explain (costs off) select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
QUERY PLAN
--------------------------------------------------------------------------------
@ -62,9 +60,33 @@ select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b
9 | 9
(9 rows)
-- Forbid parallel Hash Right Join or Hash Full Join.
explain (costs off)select * from parallel_hashjoin_test_a right outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id;
QUERY PLAN
--------------------------------------------------------------------------
Hash Right Join
Hash Cond: (parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id)
-> Seq Scan on parallel_hashjoin_test_a
-> Hash
-> Seq Scan on parallel_hashjoin_test_b
(5 rows)
select * from parallel_hashjoin_test_a right outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id;
id | id
----+----
1 | 1
2 | 2
3 | 3
4 | 4
5 | 5
6 | 6
7 | 7
8 | 8
9 | 9
10 | 10
(10 rows)
reset parallel_setup_cost;
reset min_parallel_table_scan_size;
reset parallel_tuple_cost;
reset enable_nestloop;

47
src/test/regress/sql/parallel_hashjoin.sql
View File

@ -1,22 +1,25 @@
create table parallel_hashjoin_test_a (id int);
create table parallel_hashjoin_test_b (id int);
insert into parallel_hashjoin_test_a select n from generate_series(1,1000) n;
insert into parallel_hashjoin_test_b select n from generate_series(1,10) n;
analyse parallel_hashjoin_test_a;
analyse parallel_hashjoin_test_b;
explain (costs off) select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
set parallel_setup_cost = 1;
set min_parallel_table_scan_size=0;
set parallel_tuple_cost = 0.01;
set enable_nestloop=off;
explain (costs off) select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
reset parallel_setup_cost;
reset min_parallel_table_scan_size;
reset parallel_tuple_cost;
reset enable_nestloop;
create table parallel_hashjoin_test_a (id int);
create table parallel_hashjoin_test_b (id int);
insert into parallel_hashjoin_test_a select n from generate_series(1,1000) n;
insert into parallel_hashjoin_test_b select n from generate_series(1,10) n;
analyse parallel_hashjoin_test_a;
analyse parallel_hashjoin_test_b;
explain (costs off) select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
set parallel_setup_cost = 1;
set min_parallel_table_scan_size=0;
set parallel_tuple_cost = 0.01;
set enable_nestloop=off;
explain (costs off) select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10;
-- Forbid parallel Hash Right Join or Hash Full Join.
explain (costs off)select * from parallel_hashjoin_test_a right outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id;
select * from parallel_hashjoin_test_a right outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id;
reset parallel_setup_cost;
reset min_parallel_table_scan_size;
reset parallel_tuple_cost;
reset enable_nestloop;