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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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src/backend/optimizer/path/costsize.c
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@@ -3143,6 +3143,8 @@ cached_scansel(PlannerInfo *root, RestrictInfo *rinfo, PathKey *pathkey)
* 'outer_path' is the outer input to the join
* 'inner_path' is the inner input to the join
* 'extra' contains miscellaneous information about the join
* 'parallel_hash' indicates that inner_path is partial and that a shared
* hash table will be built in parallel
*/
void
initial_cost_hashjoin(PlannerInfo *root, JoinCostWorkspace *workspace,