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Commit1ea60ad

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Fix failure to use clamp_row_est() for parallel joins.
Commit0c2070c neglected to useclamp_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
1 parentc583234 commit1ea60ad

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+18
-3
lines changed

1 file changed

+18
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‎src/backend/optimizer/path/costsize.c‎

Lines changed: 18 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -2147,7 +2147,12 @@ final_cost_nestloop(PlannerInfo *root, NestPath *path,
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/* For partial paths, scale row estimate. */
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if (path->path.parallel_workers>0)
2150-
path->path.rows /=get_parallel_divisor(&path->path);
2150+
{
2151+
doubleparallel_divisor=get_parallel_divisor(&path->path);
2152+
2153+
path->path.rows=
2154+
clamp_row_est(path->path.rows /parallel_divisor);
2155+
}
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/*
21532158
* We could include disable_cost in the preliminary estimate, but that
@@ -2569,7 +2574,12 @@ final_cost_mergejoin(PlannerInfo *root, MergePath *path,
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/* For partial paths, scale row estimate. */
25712576
if (path->jpath.path.parallel_workers>0)
2572-
path->jpath.path.rows /=get_parallel_divisor(&path->jpath.path);
2577+
{
2578+
doubleparallel_divisor=get_parallel_divisor(&path->jpath.path);
2579+
2580+
path->jpath.path.rows=
2581+
clamp_row_est(path->jpath.path.rows /parallel_divisor);
2582+
}
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/*
25752585
* We could include disable_cost in the preliminary estimate, but that
@@ -2952,7 +2962,12 @@ final_cost_hashjoin(PlannerInfo *root, HashPath *path,
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/* For partial paths, scale row estimate. */
29542964
if (path->jpath.path.parallel_workers>0)
2955-
path->jpath.path.rows /=get_parallel_divisor(&path->jpath.path);
2965+
{
2966+
doubleparallel_divisor=get_parallel_divisor(&path->jpath.path);
2967+
2968+
path->jpath.path.rows=
2969+
clamp_row_est(path->jpath.path.rows /parallel_divisor);
2970+
}
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/*
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* We could include disable_cost in the preliminary estimate, but that

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