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Support parallel aggregation.

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Parallel workers can now partially aggregate the data and pass the
transition values back to the leader, which can combine the partial
results to produce the final answer.

David Rowley, based on earlier work by Haribabu Kommi.  Reviewed by
Álvaro Herrera, Tomas Vondra, Amit Kapila, James Sewell, and me.
This commit is contained in:
Robert Haas
2016-03-21 09:20:53 -04:00
parent 7fa0064092
commit e06a38965b
23 changed files with 910 additions and 82 deletions
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7
src/include/optimizer/pathnode.h
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@@ -74,7 +74,8 @@ extern MaterialPath *create_material_path(RelOptInfo *rel, Path *subpath);
extern UniquePath *create_unique_path(PlannerInfo *root, RelOptInfo *rel,
Path *subpath, SpecialJoinInfo *sjinfo);
extern GatherPath *create_gather_path(PlannerInfo *root,
RelOptInfo *rel, Path *subpath, Relids required_outer);
RelOptInfo *rel, Path *subpath, PathTarget *target,
Relids required_outer, double *rows);
extern SubqueryScanPath *create_subqueryscan_path(PlannerInfo *root,
RelOptInfo *rel, Path *subpath,
List *pathkeys, Relids required_outer);
@@ -168,7 +169,9 @@ extern AggPath *create_agg_path(PlannerInfo *root,
List *groupClause,
List *qual,
const AggClauseCosts *aggcosts,
double numGroups);
double numGroups,
bool combineStates,
bool finalizeAggs);
extern GroupingSetsPath *create_groupingsets_path(PlannerInfo *root,
RelOptInfo *rel,
Path *subpath,