github.com/whtcorpsinc/MilevaDB-Prod@v0.0.0-20211104133533-f57f4be3b597/causetstore/petri/acyclic/causet/implementation/base.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package implementation
    15  
    16  import (
    17  	causetembedded "github.com/whtcorpsinc/milevadb/causet/embedded"
    18  	"github.com/whtcorpsinc/milevadb/causet/memo"
    19  )
    20  
    21  type baseImpl struct {
    22  	cost float64
    23  	plan causetembedded.PhysicalCauset
    24  }
    25  
    26  func (impl *baseImpl) CalcCost(outCount float64, children ...memo.Implementation) float64 {
    27  	impl.cost = 0
    28  	for _, child := range children {
    29  		impl.cost += child.GetCost()
    30  	}
    31  	return impl.cost
    32  }
    33  
    34  func (impl *baseImpl) SetCost(cost float64) {
    35  	impl.cost = cost
    36  }
    37  
    38  func (impl *baseImpl) GetCost() float64 {
    39  	return impl.cost
    40  }
    41  
    42  func (impl *baseImpl) GetCauset() causetembedded.PhysicalCauset {
    43  	return impl.plan
    44  }
    45  
    46  func (impl *baseImpl) AttachChildren(children ...memo.Implementation) memo.Implementation {
    47  	childrenCauset := make([]causetembedded.PhysicalCauset, len(children))
    48  	for i, child := range children {
    49  		childrenCauset[i] = child.GetCauset()
    50  	}
    51  	impl.plan.SetChildren(childrenCauset...)
    52  	return impl
    53  }
    54  
    55  func (impl *baseImpl) ScaleCostLimit(costLimit float64) float64 {
    56  	return costLimit
    57  }
    58  
    59  func (impl *baseImpl) GetCostLimit(costLimit float64, children ...memo.Implementation) float64 {
    60  	childrenCost := 0.0
    61  	for _, child := range children {
    62  		childrenCost += child.GetCost()
    63  	}
    64  	return costLimit - childrenCost
    65  }