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Fix failure to use clamp_row_est() for parallel joins. 

Commit 0c2070cefa neglected to use
clamp_row_est() where it should have done so.

Patch by me.  Report by Amit Kapila.

Discussion: http://postgr.es/m/CAA4eK1KPm8RYa1Kun3ZmQj9pb723b-EFN70j47Pid1vn3ByquA@mail.gmail.com
This commit is contained in:
Robert Haas 2017-03-15 12:28:54 -04:00
parent c583234662
commit 1ea60ad602
1 changed files with 18 additions and 3 deletions
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21
src/backend/optimizer/path/costsize.c
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@ -2147,7 +2147,12 @@ final_cost_nestloop(PlannerInfo *root, NestPath *path,
/* For partial paths, scale row estimate. */
if (path->path.parallel_workers > 0)
path->path.rows /= get_parallel_divisor(&path->path);
{
double parallel_divisor = get_parallel_divisor(&path->path);
path->path.rows =
clamp_row_est(path->path.rows / parallel_divisor);
}
/*
* We could include disable_cost in the preliminary estimate, but that
@ -2569,7 +2574,12 @@ final_cost_mergejoin(PlannerInfo *root, MergePath *path,
/* For partial paths, scale row estimate. */
if (path->jpath.path.parallel_workers > 0)
path->jpath.path.rows /= get_parallel_divisor(&path->jpath.path);
{
double parallel_divisor = get_parallel_divisor(&path->jpath.path);
path->jpath.path.rows =
clamp_row_est(path->jpath.path.rows / parallel_divisor);
}
/*
* We could include disable_cost in the preliminary estimate, but that
@ -2952,7 +2962,12 @@ final_cost_hashjoin(PlannerInfo *root, HashPath *path,
/* For partial paths, scale row estimate. */
if (path->jpath.path.parallel_workers > 0)
path->jpath.path.rows /= get_parallel_divisor(&path->jpath.path);
{
double parallel_divisor = get_parallel_divisor(&path->jpath.path);
path->jpath.path.rows =
clamp_row_est(path->jpath.path.rows / parallel_divisor);
}
/*
* We could include disable_cost in the preliminary estimate, but that