diff options
author | David Storch <david.storch@10gen.com> | 2014-06-03 11:04:28 -0400 |
---|---|---|
committer | David Storch <david.storch@10gen.com> | 2014-06-11 11:57:00 -0400 |
commit | 3e39c96ebbd90ebeb91d46f9dace6988a0152763 (patch) | |
tree | 147db9b069d4c65e8233a3f826dde9cefeddf60c /src/mongo/db/exec/multi_plan.h | |
parent | c4db5777873c4973facc7ea5ba727565e7658d73 (diff) | |
download | mongo-3e39c96ebbd90ebeb91d46f9dace6988a0152763.tar.gz |
SERVER-14096 explain find() at queryPlanner verbosity
Enable by the setParameter 'enableNewExplain'
Diffstat (limited to 'src/mongo/db/exec/multi_plan.h')
-rw-r--r-- | src/mongo/db/exec/multi_plan.h | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/src/mongo/db/exec/multi_plan.h b/src/mongo/db/exec/multi_plan.h index 359f3381198..fe25dcddfde 100644 --- a/src/mongo/db/exec/multi_plan.h +++ b/src/mongo/db/exec/multi_plan.h @@ -53,6 +53,11 @@ namespace mongo { virtual ~MultiPlanStage(); + /** + * Helper used by the destructor to delete losing candidate plans. + */ + void clearCandidates(); + virtual bool isEOF(); virtual StageState work(WorkingSetID* out); @@ -69,7 +74,7 @@ namespace mongo { void addPlan(QuerySolution* solution, PlanStage* root, WorkingSet* sharedWs); /** - * Runs all plans added by addPlan, ranks them, and picks a best. Deletes all loser plans. + * Runs all plans added by addPlan, ranks them, and picks a best. * All further calls to getNext(...) will return results from the best plan. */ void pickBestPlan(); @@ -90,6 +95,35 @@ namespace mongo { */ bool hasBackupPlan() const; + /** + * Gathers execution stats for all losing plans. + */ + vector<PlanStageStats*>* generateCandidateStats(); + + // + // Used by explain. + // + + /** + * Runs the winning plan into it hits EOF or returns DEAD, throwing out the results. + * Execution stats are gathered in the process. + * + * You can call this after calling pickBestPlan(...). It expects that a winning plan + * has already been selected. + */ + Status executeWinningPlan(); + + /** + * Runs the candidate plans until each has either hit EOF or returned DEAD. Results + * from the plans are thrown out, but execution stats are gathered. + * + * You can call this after calling pickBestPlan(...). It expects that a winning plan + * has already been selected. + */ + Status executeAllPlans(); + + static const char* kStageType; + private: // // Have all our candidate plans do something. |