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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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src/include/optimizer/planmain.h
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@@ -29,6 +29,7 @@ typedef enum
#define DEFAULT_CURSOR_TUPLE_FRACTION 0.1
extern double cursor_tuple_fraction;
extern int force_parallel_mode;
extern bool parallel_leader_participation;
/* query_planner callback to compute query_pathkeys */
typedef void (*query_pathkeys_callback) (PlannerInfo *root, void *extra);