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Set correct cost data in Gather node added by force_parallel_mode.

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We were just leaving the cost fields zeroes, which produces obviously bogus
output with force_parallel_mode = on.  With force_parallel_mode = regress,
the zeroes are hidden, but I wonder if they wouldn't still confuse add-on
code such as auto_explain.
This commit is contained in:
Tom Lane
2016-07-03 15:35:29 -04:00
parent c89d507649
commit 0e495c5e2f
1 changed files with 15 additions and 0 deletions
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15
src/backend/optimizer/plan/planner.c
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@@ -343,7 +343,22 @@ standard_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
gather->num_workers = 1;
gather->single_copy = true;
gather->invisible = (force_parallel_mode == FORCE_PARALLEL_REGRESS);
/*
* Ideally we'd use cost_gather here, but setting up dummy path data
* to satisfy it doesn't seem much cleaner than knowing what it does.
*/
gather->plan.startup_cost = top_plan->startup_cost +
parallel_setup_cost;
gather->plan.total_cost = top_plan->total_cost +
parallel_setup_cost + parallel_tuple_cost * top_plan->plan_rows;
gather->plan.plan_rows = top_plan->plan_rows;
gather->plan.plan_width = top_plan->plan_width;
gather->plan.parallel_aware = false;
/* use parallel mode for parallel plans. */
root->glob->parallelModeNeeded = true;
top_plan = &gather->plan;
}