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Assorted preparatory refactoring for partition-wise join.

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Instead of duplicating the logic to search for a matching
ParamPathInfo in multiple places, factor it out into a separate
function.

Pass only the relevant bits of the PartitionKey to
partition_bounds_equal instead of the whole thing, because
partition-wise join will want to call this without having a
PartitionKey available.

Adjust allow_star_schema_join and calc_nestloop_required_outer
to take relevant Relids rather than the entire Path, because
partition-wise join will want to call it with the top-parent
relids to determine whether a child join is allowable.

Ashutosh Bapat.  Review and testing of the larger patch set of which
this is a part by Amit Langote, Rajkumar Raghuwanshi, Rafia Sabih,
Thomas Munro, Dilip Kumar, and me.

Discussion: http://postgr.es/m/CA+TgmobQK80vtXjAsPZWWXd7c8u13G86gmuLupN+uUJjA+i4nA@mail.gmail.com
This commit is contained in:
Robert Haas
2017-08-15 12:30:38 -04:00
parent 00418c6124
commit e139f1953f
7 changed files with 62 additions and 46 deletions
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7
src/include/optimizer/pathnode.h
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@@ -112,7 +112,10 @@ extern ForeignPath *create_foreignscan_path(PlannerInfo *root, RelOptInfo *rel,
Path *fdw_outerpath,
List *fdw_private);
extern Relids calc_nestloop_required_outer(Path *outer_path, Path *inner_path);
extern Relids calc_nestloop_required_outer(Relids outerrelids,
Relids outer_paramrels,
Relids innerrelids,
Relids inner_paramrels);
extern Relids calc_non_nestloop_required_outer(Path *outer_path, Path *inner_path);
extern NestPath *create_nestloop_path(PlannerInfo *root,
@@ -285,5 +288,7 @@ extern ParamPathInfo *get_joinrel_parampathinfo(PlannerInfo *root,
List **restrict_clauses);
extern ParamPathInfo *get_appendrel_parampathinfo(RelOptInfo *appendrel,
Relids required_outer);
extern ParamPathInfo *find_param_path_info(RelOptInfo *rel,
Relids required_outer);
#endif /* PATHNODE_H */