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HI,
I use vops with PG 10 beta1, but when i query the countall with parallel, the result is not correct.
Is it a bug?
the real count is :
postgres=# set max_parallel_workers_per_gather =0;
SET
Time: 0.153 ms
postgres=# select countall(*) from vc;
countall
-----------
150000000
(1 row)
Time: 933.433 ms
parallel
ostgres=# set max_parallel_workers_per_gather =2;
SET
Time: 0.110 ms
postgres=# select countall(*) from vc;
countall
----------
71552512
(1 row)
Time: 503.081 ms
postgres=# explain select countall(*) from vc;
QUERY PLAN
---------------------------------------------------------------------------------------
Finalize Aggregate (cost=179617.95..179617.96 rows=1 width=8)
-> Gather (cost=179617.94..179617.95 rows=2 width=8)
Workers Planned: 2
-> Partial Aggregate (cost=179617.94..179617.95 rows=1 width=8)
-> Parallel Seq Scan on vc (cost=0.00..177176.55 rows=976555 width=0)
(5 rows)
Time: 0.313 ms
postgres=# set max_parallel_workers_per_gather =4;
SET
Time: 0.134 ms
postgres=# explain select countall(*) from vc;
QUERY PLAN
---------------------------------------------------------------------------------------
Finalize Aggregate (cost=174735.18..174735.19 rows=1 width=8)
-> Gather (cost=174735.16..174735.17 rows=4 width=8)
Workers Planned: 4
-> Partial Aggregate (cost=174735.16..174735.17 rows=1 width=8)
-> Parallel Seq Scan on vc (cost=0.00..173270.33 rows=585933 width=0)
(5 rows)
Time: 0.331 ms
postgres=# select countall(*) from vc;
countall
----------
46793600
(1 row)
Time: 351.865 ms
best regards, thank you.
The text was updated successfully, but these errors were encountered:
HI,
I use vops with PG 10 beta1, but when i query the countall with parallel, the result is not correct.
Is it a bug?
the real count is :
parallel
best regards, thank you.
The text was updated successfully, but these errors were encountered: