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65 lines
1.7 KiB
65 lines
1.7 KiB
// Copyright 2018 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 implementation
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import (
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plannercore "github.com/pingcap/tidb/planner/core"
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"github.com/pingcap/tidb/planner/memo"
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)
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type baseImpl struct {
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cost float64
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plan plannercore.PhysicalPlan
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}
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func (impl *baseImpl) CalcCost(outCount float64, children ...memo.Implementation) float64 {
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impl.cost = 0
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for _, child := range children {
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impl.cost += child.GetCost()
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}
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return impl.cost
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}
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func (impl *baseImpl) SetCost(cost float64) {
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impl.cost = cost
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}
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func (impl *baseImpl) GetCost() float64 {
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return impl.cost
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}
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func (impl *baseImpl) GetPlan() plannercore.PhysicalPlan {
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return impl.plan
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}
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func (impl *baseImpl) AttachChildren(children ...memo.Implementation) memo.Implementation {
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childrenPlan := make([]plannercore.PhysicalPlan, len(children))
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for i, child := range children {
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childrenPlan[i] = child.GetPlan()
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}
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impl.plan.SetChildren(childrenPlan...)
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return impl
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}
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func (impl *baseImpl) ScaleCostLimit(costLimit float64) float64 {
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return costLimit
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}
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func (impl *baseImpl) GetCostLimit(costLimit float64, children ...memo.Implementation) float64 {
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childrenCost := 0.0
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for _, child := range children {
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childrenCost += child.GetCost()
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}
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return costLimit - childrenCost
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}
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