SERVER-17364 Unify handling of child stages into PlanStage base class

This is prep for adding more methods that need to propagate to children.

1 files changed, 3 insertions, 9 deletions

diff --git a/src/mongo/db/exec/fetch.h b/src/mongo/db/exec/fetch.h
index 9a0ff81c021..edfd6c35a5f 100644
--- a/src/mongo/db/exec/fetch.h
+++ b/src/mongo/db/exec/fetch.h
@@ -60,11 +60,9 @@ public:
     virtual bool isEOF();
     virtual StageState work(WorkingSetID* out);
 
-    virtual void saveState();
-    virtual void restoreState(OperationContext* opCtx);
-    virtual void invalidate(OperationContext* txn, const RecordId& dl, InvalidationType type);
-
-    virtual std::vector<PlanStage*> getChildren() const;
+    virtual void doSaveState();
+    virtual void doRestoreState(OperationContext* opCtx);
+    virtual void doInvalidate(OperationContext* txn, const RecordId& dl, InvalidationType type);
 
     virtual StageType stageType() const {
         return STAGE_FETCH;
@@ -72,8 +70,6 @@ public:
 
     std::unique_ptr<PlanStageStats> getStats();
 
-    virtual const CommonStats* getCommonStats() const;
-
     virtual const SpecificStats* getSpecificStats() const;
 
     static const char* kStageType;
@@ -95,7 +91,6 @@ private:
 
     // _ws is not owned by us.
     WorkingSet* _ws;
-    std::unique_ptr<PlanStage> _child;
 
     // The filter is not owned by us.
     const MatchExpression* _filter;
@@ -104,7 +99,6 @@ private:
     WorkingSetID _idRetrying;
 
     // Stats
-    CommonStats _commonStats;
     FetchStats _specificStats;
 };