Re: Parallel execution and prepared statements

On Wed, Nov 16, 2016 at 2:27 AM, Tobias Bussmann <t.bussmann@gmx.net> wrote:
> As the patch in [1] targeting the execution of the plan in ExecutePlan depending on the destination was declined, I
hackedaround a bit to find another way to use parallel mode with SQL prepared statements while disabling the parallel
executionin case of an non read-only execution. For this I used the already present test for an existing intoClause in
ExecuteQueryto set the parallelModeNeeded flag of the prepared statement. This results in a non parallel execution of
theparallel plan, as we see with a non-zero fetch count used with the extended query protocol. Despite this patch seem
towork in my tests, I'm by no means confident this being a proper way of handling the situation in question. 
>

Can you once test by just passing CURSOR_OPT_PARALLEL_OK in
PrepareQuery() and run the tests by having forc_parallel_mode=regress?
It seems to me that the code in the planner is changed for setting a
parallelModeNeeded flag, so it might work as it is.

--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com