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Commit5feb78a

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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 parent18dc2ae commit5feb78a

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+18
-3
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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
@@ -1998,7 +1998,12 @@ 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)
2001-
path->path.rows /=get_parallel_divisor(&path->path);
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{
2002+
doubleparallel_divisor=get_parallel_divisor(&path->path);
2003+
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path->path.rows=
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clamp_row_est(path->path.rows /parallel_divisor);
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}
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/*
20042009
* We could include disable_cost in the preliminary estimate, but that
@@ -2420,7 +2425,12 @@ final_cost_mergejoin(PlannerInfo *root, MergePath *path,
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/* For partial paths, scale row estimate. */
24222427
if (path->jpath.path.parallel_workers>0)
2423-
path->jpath.path.rows /=get_parallel_divisor(&path->jpath.path);
2428+
{
2429+
doubleparallel_divisor=get_parallel_divisor(&path->jpath.path);
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2431+
path->jpath.path.rows=
2432+
clamp_row_est(path->jpath.path.rows /parallel_divisor);
2433+
}
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/*
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* We could include disable_cost in the preliminary estimate, but that
@@ -2803,7 +2813,12 @@ final_cost_hashjoin(PlannerInfo *root, HashPath *path,
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/* For partial paths, scale row estimate. */
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if (path->jpath.path.parallel_workers>0)
2806-
path->jpath.path.rows /=get_parallel_divisor(&path->jpath.path);
2816+
{
2817+
doubleparallel_divisor=get_parallel_divisor(&path->jpath.path);
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path->jpath.path.rows=
2820+
clamp_row_est(path->jpath.path.rows /parallel_divisor);
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}
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/*
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* We could include disable_cost in the preliminary estimate, but that

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