From 70846fb43cc7c035bffd26664a75aaff6f651ac7 Mon Sep 17 00:00:00 2001
From: hanfei <hanfei19910905@gmail.com>
Date: Mon, 14 Nov 2016 18:36:57 +0800
Subject: [PATCH] clean useless code.

---
 plan/plan.go                | 10 +++----
 plan/predicate_push_down.go | 54 -------------------------------------
 2 files changed, 5 insertions(+), 59 deletions(-)

diff --git a/plan/plan.go b/plan/plan.go
index a4a283ca6a..7ee760a0ec 100644
--- a/plan/plan.go
+++ b/plan/plan.go
@@ -179,7 +179,7 @@ type PhysicalPlan interface {
 type baseLogicalPlan struct {
 	basePlan
 	planMap map[string]*physicalPlanInfo
-	self    Plan
+	self    LogicalPlan
 }
 
 func (p *baseLogicalPlan) getPlanInfo(prop *requiredProperty) (*physicalPlanInfo, error) {
@@ -233,20 +233,20 @@ func newBaseLogicalPlan(tp string, a *idAllocator) baseLogicalPlan {
 // PredicatePushDown implements LogicalPlan PredicatePushDown interface.
 func (p *baseLogicalPlan) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
 	if len(p.GetChildren()) == 0 {
-		return predicates, p, nil
+		return predicates, p.self, nil
 	}
 	child := p.GetChildByIndex(0).(LogicalPlan)
 	rest, _, err := child.PredicatePushDown(predicates)
 	if err != nil {
-		return nil, p, errors.Trace(err)
+		return nil, nil, errors.Trace(err)
 	}
 	if len(rest) > 0 {
 		err = addSelection(p, child, rest, p.allocator)
 		if err != nil {
-			return nil, p, errors.Trace(err)
+			return nil, nil, errors.Trace(err)
 		}
 	}
-	return nil, p, nil
+	return nil, p.self, nil
 }
 
 // PruneColumnsAndResolveIndices implements LogicalPlan PruneColumnsAndResolveIndices interface.
diff --git a/plan/predicate_push_down.go b/plan/predicate_push_down.go
index 2435de2567..a86dec87bf 100644
--- a/plan/predicate_push_down.go
+++ b/plan/predicate_push_down.go
@@ -619,57 +619,3 @@ func (p *Limit) PredicatePushDown(predicates []expression.Expression) ([]express
 	_, _, err := p.baseLogicalPlan.PredicatePushDown(nil)
 	return predicates, p, errors.Trace(err)
 }
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *Sort) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *Trim) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *MaxOneRow) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *Exists) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *Distinct) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *Insert) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *SelectLock) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *Update) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}
-
-// PredicatePushDown implements LogicalPlan PredicatePushDown interface.
-func (p *Delete) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan, error) {
-	ret, _, err := p.baseLogicalPlan.PredicatePushDown(predicates)
-	return ret, p, errors.Trace(err)
-}