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| author | Robert Haas <rhaas@postgresql.org> | 2015-09-28 21:55:57 -0400 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2015-09-28 21:55:57 -0400 |
| commit | d1b7c1ffe72e86932b5395f29e006c3f503bc53d (patch) | |
| tree | 9758eda06ae19401beef3c74373ecb076e9f9238 /src/backend/optimizer/plan/setrefs.c | |
| parent | 0557dc276f1022965f72dc8bcfc820dfd83a7dc2 (diff) | |
| download | postgresql-d1b7c1ffe72e86932b5395f29e006c3f503bc53d.tar.gz postgresql-d1b7c1ffe72e86932b5395f29e006c3f503bc53d.zip | |
Parallel executor support.
This code provides infrastructure for a parallel leader to start up
parallel workers to execute subtrees of the plan tree being executed
in the master. User-supplied parameters from ParamListInfo are passed
down, but PARAM_EXEC parameters are not. Various other constructs,
such as initplans, subplans, and CTEs, are also not currently shared.
Nevertheless, there's enough here to support a basic implementation of
parallel query, and we can lift some of the current restrictions as
needed.
Amit Kapila and Robert Haas
Diffstat (limited to 'src/backend/optimizer/plan/setrefs.c')
| -rw-r--r-- | src/backend/optimizer/plan/setrefs.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/backend/optimizer/plan/setrefs.c b/src/backend/optimizer/plan/setrefs.c index daeb5842d04..3c8169725a0 100644 --- a/src/backend/optimizer/plan/setrefs.c +++ b/src/backend/optimizer/plan/setrefs.c @@ -174,6 +174,8 @@ static bool extract_query_dependencies_walker(Node *node, * Currently, relations and user-defined functions are the only types of * objects that are explicitly tracked this way. * + * 7. We assign every plan node in the tree a unique ID. + * * We also perform one final optimization step, which is to delete * SubqueryScan plan nodes that aren't doing anything useful (ie, have * no qual and a no-op targetlist). The reason for doing this last is that @@ -436,6 +438,9 @@ set_plan_refs(PlannerInfo *root, Plan *plan, int rtoffset) if (plan == NULL) return NULL; + /* Assign this node a unique ID. */ + plan->plan_node_id = root->glob->lastPlanNodeId++; + /* * Plan-type-specific fixes */ |