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Add parallel_leader_participation GUC.

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Sometimes, for testing, it's useful to have the leader do nothing but
read tuples from workers; and it's possible that could work out better
even in production.

Thomas Munro, reviewed by Amit Kapila and by me.  A few final tweaks
by me.

Discussion: http://postgr.es/m/CAEepm=2U++Lp3bNTv2Bv_kkr5NE2pOyHhxU=G0YTa4ZhSYhHiw@mail.gmail.com
This commit is contained in:
Robert Haas
2017-11-15 08:17:29 -05:00
parent 7518049980
commit e5253fdc4f
10 changed files with 205 additions and 9 deletions
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1
src/backend/optimizer/plan/planner.c
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@ -61,6 +61,7 @@
/* GUC parameters */
double cursor_tuple_fraction = DEFAULT_CURSOR_TUPLE_FRACTION;
int force_parallel_mode = FORCE_PARALLEL_OFF;
bool parallel_leader_participation = true;
/* Hook for plugins to get control in planner() */
planner_hook_type planner_hook = NULL;