27 lines
850 B
Go
27 lines
850 B
Go
// 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 memo
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import (
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plannercore "github.com/pingcap/tidb/planner/core"
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)
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// Implementation defines the interface for cost of physical plan.
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type Implementation interface {
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CalcCost(outCount float64, childCosts []float64, children ...*Group) float64
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SetCost(cost float64)
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GetCost() float64
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GetPlan() plannercore.PhysicalPlan
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}
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