/
physical_tablescan.go
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/
physical_tablescan.go
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//
// This source code is a modified form of original source from the TiDB project, which has the following copyright header(s):
//
// Copyright 2016 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 planner
import (
"github.com/pingcap/parser/model"
"github.com/squareup/pranadb/tidb/expression"
"github.com/squareup/pranadb/tidb/sessionctx"
"github.com/squareup/pranadb/tidb/statistics"
"github.com/squareup/pranadb/tidb/util/ranger"
)
var _ PhysicalPlan = &PhysicalTableScan{}
// PhysicalTableScan represents a table scan plan.
type PhysicalTableScan struct {
physicalSchemaProducer
// AccessCondition is used to calculate range.
AccessCondition []expression.Expression
Table *model.TableInfo
Columns []*model.ColumnInfo
DBName model.CIStr
Ranges []*ranger.Range
PkCols []*expression.Column
TableAsName *model.CIStr
// Hist is the histogram when the query was issued.
// It is used for query feedback.
Hist *statistics.Histogram
rangeDecidedBy []*expression.Column
// HandleIdx is the index of handle, which is only used for admin check table.
HandleIdx []int
HandleCols HandleCols
IsGlobalRead bool
// KeepOrder is true, if sort data by scanning pkcol,
KeepOrder bool
Desc bool
isChildOfIndexLookUp bool
}
// Init initializes PhysicalTableScan.
func (p PhysicalTableScan) Init(ctx sessionctx.Context, offset int) *PhysicalTableScan {
p.basePhysicalPlan = newBasePhysicalPlan(ctx, TypeTableScan, &p, offset)
return &p
}