35 lines
1.1 KiB
Go
35 lines
1.1 KiB
Go
// 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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// TableDualImpl implementation of PhysicalTableDual.
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type TableDualImpl struct {
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baseImpl
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}
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// NewTableDualImpl creates a new table dual Implementation.
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func NewTableDualImpl(dual *plannercore.PhysicalTableDual) *TableDualImpl {
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return &TableDualImpl{baseImpl{plan: dual}}
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}
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// CalcCost calculates the cost of the table dual Implementation.
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func (impl *TableDualImpl) CalcCost(outCount float64, childCosts []float64, children ...*memo.Group) float64 {
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return 0
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}
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