address the comment

Signed-off-by: yisaer <disxiaofei@163.com>

planner/core/explain.go

@@ -34,7 +34,6 @@ import (
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/util/plancodec"
 	"github.com/pingcap/tidb/util/stringutil"
-	"github.com/pingcap/tidb/util/tracing"
 	"github.com/pingcap/tipb/go-tipb"
 )
 
@@ -891,23 +890,11 @@ func (p *LogicalAggregation) ExplainInfo() string {
 	return buffer.String()
 }
 
-func (p *LogicalAggregation) buildLogicalPlanTrace() *tracing.LogicalPlanTrace {
-	lpt := p.baseLogicalPlan.buildLogicalPlanTrace()
-	lpt.ExplainInfo = p.ExplainInfo()
-	return lpt
-}
-
 // ExplainInfo implements Plan interface.
 func (p *LogicalProjection) ExplainInfo() string {
 	return expression.ExplainExpressionList(p.Exprs, p.schema)
 }
 
-func (p *LogicalProjection) buildLogicalPlanTrace() *tracing.LogicalPlanTrace {
-	lpt := p.baseLogicalPlan.buildLogicalPlanTrace()
-	lpt.ExplainInfo = p.ExplainInfo()
-	return lpt
-}
-
 // ExplainInfo implements Plan interface.
 func (p *LogicalSelection) ExplainInfo() string {
 	return string(expression.SortedExplainExpressionList(p.Conditions))
@@ -943,12 +930,6 @@ func (ds *DataSource) ExplainInfo() string {
 	return buffer.String()
 }
 
-func (ds *DataSource) buildLogicalPlanTrace() *tracing.LogicalPlanTrace {
-	lpt := ds.baseLogicalPlan.buildLogicalPlanTrace()
-	lpt.ExplainInfo = ds.ExplainInfo()
-	return lpt
-}
-
 // ExplainInfo implements Plan interface.
 func (p *PhysicalExchangeSender) ExplainInfo() string {
 	buffer := bytes.NewBufferString("ExchangeType: ")

planner/core/optimizer.go

@@ -102,7 +102,7 @@ func (op *logicalOptimizeOp) appendBeforeRuleOptimize(index int, name string, be
 	if op.tracer == nil {
 		return
 	}
-	op.tracer.AppendRuleTracerBeforeRuleOptimize(index, name, before.buildLogicalPlanTrace())
+	op.tracer.AppendRuleTracerBeforeRuleOptimize(index, name, before.buildLogicalPlanTrace(before))
 }
 
 func (op *logicalOptimizeOp) appendStepToCurrent(id int, tp, reason, action string) {
@@ -116,7 +116,7 @@ func (op *logicalOptimizeOp) trackAfterRuleOptimize(after LogicalPlan) {
 	if op.tracer == nil {
 		return
 	}
-	op.tracer.TrackLogicalPlanAfterRuleOptimize(after.buildLogicalPlanTrace())
+	op.tracer.TrackLogicalPlanAfterRuleOptimize(after.buildLogicalPlanTrace(after))
 }
 
 // logicalOptRule means a logical optimizing rule, which contains decorrelate, ppd, column pruning, etc.

planner/core/plan.go

@@ -68,6 +68,11 @@ type Plan interface {
 	SelectBlockOffset() int
 }
 
+type OperatorExplainInfo interface {
+	// ExplainInfo returns operator information to be explained.
+	ExplainInfo() string
+}
+
 func enforceProperty(p *property.PhysicalProperty, tsk task, ctx sessionctx.Context) task {
 	if p.TaskTp == property.MppTaskType {
 		if mpp, ok := tsk.(*mppTask); ok && !mpp.invalid() {
@@ -308,7 +313,7 @@ type LogicalPlan interface {
 	canPushToCop(store kv.StoreType) bool
 
 	// buildLogicalPlanTrace clone necessary information from LogicalPlan
-	buildLogicalPlanTrace() *tracing.LogicalPlanTrace
+	buildLogicalPlanTrace(op OperatorExplainInfo) *tracing.LogicalPlanTrace
 }
 
 // PhysicalPlan is a tree of the physical operators.
@@ -382,10 +387,10 @@ func (p *baseLogicalPlan) ExplainInfo() string {
 }
 
 // buildLogicalPlanTrace implements LogicalPlan
-func (p *baseLogicalPlan) buildLogicalPlanTrace() *tracing.LogicalPlanTrace {
-	planTrace := &tracing.LogicalPlanTrace{ID: p.ID(), TP: p.TP()}
+func (p *baseLogicalPlan) buildLogicalPlanTrace(op OperatorExplainInfo) *tracing.LogicalPlanTrace {
+	planTrace := &tracing.LogicalPlanTrace{ID: p.ID(), TP: p.TP(), ExplainInfo: op.ExplainInfo()}
 	for _, child := range p.Children() {
-		planTrace.Children = append(planTrace.Children, child.buildLogicalPlanTrace())
+		planTrace.Children = append(planTrace.Children, child.buildLogicalPlanTrace(child))
 	}
 	return planTrace
 }