// Copyright 2019 PingCAP, Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // See the License for the specific language governing permissions and // limitations under the License. package implementation import ( plannercore "github.com/pingcap/tidb/planner/core" "github.com/pingcap/tidb/planner/memo" ) // HashJoinImpl is the implementation for PhysicalHashJoin. type HashJoinImpl struct { baseImpl } // CalcCost implements Implementation CalcCost interface. func (impl *HashJoinImpl) CalcCost(outCount float64, children ...memo.Implementation) float64 { hashJoin := impl.plan.(*plannercore.PhysicalHashJoin) // The children here are only used to calculate the cost. hashJoin.SetChildren(children[0].GetPlan(), children[1].GetPlan()) selfCost := hashJoin.GetCost(children[0].GetPlan().StatsCount(), children[1].GetPlan().StatsCount()) impl.cost = selfCost + children[0].GetCost() + children[1].GetCost() return impl.cost } // AttachChildren implements Implementation AttachChildren interface. func (impl *HashJoinImpl) AttachChildren(children ...memo.Implementation) memo.Implementation { hashJoin := impl.plan.(*plannercore.PhysicalHashJoin) hashJoin.SetChildren(children[0].GetPlan(), children[1].GetPlan()) return impl } // NewHashJoinImpl creates a new HashJoinImpl. func NewHashJoinImpl(hashJoin *plannercore.PhysicalHashJoin) *HashJoinImpl { return &HashJoinImpl{baseImpl{plan: hashJoin}} } // MergeJoinImpl is the implementation for PhysicalMergeJoin. type MergeJoinImpl struct { baseImpl } // CalcCost implements Implementation CalcCost interface. func (impl *MergeJoinImpl) CalcCost(outCount float64, children ...memo.Implementation) float64 { mergeJoin := impl.plan.(*plannercore.PhysicalMergeJoin) // The children here are only used to calculate the cost. mergeJoin.SetChildren(children[0].GetPlan(), children[1].GetPlan()) selfCost := mergeJoin.GetCost(children[0].GetPlan().StatsCount(), children[1].GetPlan().StatsCount()) impl.cost = selfCost + children[0].GetCost() + children[1].GetCost() return impl.cost } // AttachChildren implements Implementation AttachChildren interface. func (impl *MergeJoinImpl) AttachChildren(children ...memo.Implementation) memo.Implementation { mergeJoin := impl.plan.(*plannercore.PhysicalMergeJoin) mergeJoin.SetChildren(children[0].GetPlan(), children[1].GetPlan()) mergeJoin.SetSchema(plannercore.BuildPhysicalJoinSchema(mergeJoin.JoinType, mergeJoin)) return impl } // NewMergeJoinImpl creates a new MergeJoinImpl. func NewMergeJoinImpl(mergeJoin *plannercore.PhysicalMergeJoin) *MergeJoinImpl { return &MergeJoinImpl{baseImpl{plan: mergeJoin}} }