69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package core
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import (
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"bytes"
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"sync"
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"github.com/pingcap/tidb/util/plancodec"
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)
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var encoderPool = sync.Pool{
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New: func() interface{} {
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return &planEncoder{}
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},
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}
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type planEncoder struct {
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buf bytes.Buffer
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encodedPlans map[int]bool
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}
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// EncodePlan is used to encodePlan the plan to the plan tree with compressing.
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func EncodePlan(p PhysicalPlan) string {
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pn := encoderPool.Get().(*planEncoder)
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defer encoderPool.Put(pn)
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return pn.encodePlanTree(p)
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}
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func (pn *planEncoder) encodePlanTree(p PhysicalPlan) string {
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pn.encodedPlans = make(map[int]bool)
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pn.buf.Reset()
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pn.encodePlan(p, true, 0)
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return plancodec.Compress(pn.buf.Bytes())
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}
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func (pn *planEncoder) encodePlan(p PhysicalPlan, isRoot bool, depth int) {
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plancodec.EncodePlanNode(depth, p.ID(), p.TP(), isRoot, p.statsInfo().RowCount, p.ExplainInfo(), &pn.buf)
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pn.encodedPlans[p.ID()] = true
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depth++
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for _, child := range p.Children() {
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if pn.encodedPlans[child.ID()] {
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continue
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}
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pn.encodePlan(child.(PhysicalPlan), isRoot, depth)
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}
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switch copPlan := p.(type) {
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case *PhysicalTableReader:
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pn.encodePlan(copPlan.tablePlan, false, depth)
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case *PhysicalIndexReader:
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pn.encodePlan(copPlan.indexPlan, false, depth)
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case *PhysicalIndexLookUpReader:
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pn.encodePlan(copPlan.indexPlan, false, depth)
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pn.encodePlan(copPlan.tablePlan, false, depth)
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}
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}
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