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74 lines
2.9 KiB
74 lines
2.9 KiB
// 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 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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// HashJoinImpl is the implementation for PhysicalHashJoin.
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type HashJoinImpl struct {
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baseImpl
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}
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// CalcCost implements Implementation CalcCost interface.
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func (impl *HashJoinImpl) CalcCost(outCount float64, children ...memo.Implementation) float64 {
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hashJoin := impl.plan.(*plannercore.PhysicalHashJoin)
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// The children here are only used to calculate the cost.
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hashJoin.SetChildren(children[0].GetPlan(), children[1].GetPlan())
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selfCost := hashJoin.GetCost(children[0].GetPlan().StatsCount(), children[1].GetPlan().StatsCount())
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impl.cost = selfCost + children[0].GetCost() + children[1].GetCost()
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return impl.cost
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}
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// AttachChildren implements Implementation AttachChildren interface.
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func (impl *HashJoinImpl) AttachChildren(children ...memo.Implementation) memo.Implementation {
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hashJoin := impl.plan.(*plannercore.PhysicalHashJoin)
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hashJoin.SetChildren(children[0].GetPlan(), children[1].GetPlan())
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return impl
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}
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// NewHashJoinImpl creates a new HashJoinImpl.
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func NewHashJoinImpl(hashJoin *plannercore.PhysicalHashJoin) *HashJoinImpl {
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return &HashJoinImpl{baseImpl{plan: hashJoin}}
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}
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// MergeJoinImpl is the implementation for PhysicalMergeJoin.
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type MergeJoinImpl struct {
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baseImpl
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}
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// CalcCost implements Implementation CalcCost interface.
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func (impl *MergeJoinImpl) CalcCost(outCount float64, children ...memo.Implementation) float64 {
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mergeJoin := impl.plan.(*plannercore.PhysicalMergeJoin)
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// The children here are only used to calculate the cost.
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mergeJoin.SetChildren(children[0].GetPlan(), children[1].GetPlan())
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selfCost := mergeJoin.GetCost(children[0].GetPlan().StatsCount(), children[1].GetPlan().StatsCount())
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impl.cost = selfCost + children[0].GetCost() + children[1].GetCost()
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return impl.cost
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}
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// AttachChildren implements Implementation AttachChildren interface.
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func (impl *MergeJoinImpl) AttachChildren(children ...memo.Implementation) memo.Implementation {
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mergeJoin := impl.plan.(*plannercore.PhysicalMergeJoin)
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mergeJoin.SetChildren(children[0].GetPlan(), children[1].GetPlan())
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mergeJoin.SetSchema(plannercore.BuildPhysicalJoinSchema(mergeJoin.JoinType, mergeJoin))
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return impl
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}
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// NewMergeJoinImpl creates a new MergeJoinImpl.
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func NewMergeJoinImpl(mergeJoin *plannercore.PhysicalMergeJoin) *MergeJoinImpl {
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return &MergeJoinImpl{baseImpl{plan: mergeJoin}}
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}
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