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Fix costing of parallel hash joins.

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Commit 1804284042 established that single-batch
parallel-aware hash joins could create one large shared hash table using the
combined work_mem budget of all participants.  The costing accidentally
assumed that parallel-oblivious hash joins could also do that.  The
documentation for initial_cost_hashjoin() also failed to mention the new
argument.  Repair.

Author: Thomas Munro
Reported-By: Antonin Houska
Reviewed-By: Antonin Houska
Discussion: https://postgr.es/m/12441.1513935950%40localhost
This commit is contained in:
Peter Eisentraut
2018-03-06 21:54:37 -05:00
parent a3739e376f
commit 5b804cc168
2 changed files with 3 additions and 1 deletions
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2
src/backend/optimizer/path/joinpath.c
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@@ -814,7 +814,7 @@ try_partial_hashjoin_path(PlannerInfo *root,
* cost. Bail out right away if it looks terrible.
*/
initial_cost_hashjoin(root, &workspace, jointype, hashclauses,
outer_path, inner_path, extra, true);
outer_path, inner_path, extra, parallel_hash);
if (!add_partial_path_precheck(joinrel, workspace.total_cost, NIL))
return;