tidb logical_property 源码
tidb logical_property 代码
文件路径：/planner/property/logical_property.go
// Copyright 2018 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package property
import (
"github.com/pingcap/tidb/expression"
)
// LogicalProperty stands for logical properties such as schema of expression,
// or statistics of columns in schema for output of Group.
// All group expressions in a group share same logical property.
type LogicalProperty struct {
Stats *StatsInfo
Schema *expression.Schema
MaxOneRow bool
}
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