tidb delete_range_util 源码
tidb delete_range_util 代码
文件路径：/ddl/delete_range_util.go
// Copyright 2022 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 ddl
type tblIdxID struct {
physicalID int64
indexID int64
}
type elementIDAlloc struct {
physicalIDs map[int64]int64
indexIDs map[tblIdxID]int64
}
func (e *elementIDAlloc) allocForIndexID(physicalID, indexID int64) int64 {
if e.indexIDs == nil {
e.indexIDs = make(map[tblIdxID]int64)
}
k := tblIdxID{physicalID: physicalID, indexID: indexID}
if id, found := e.indexIDs[k]; found {
return id
}
next := int64(len(e.physicalIDs) + len(e.indexIDs) + 1)
e.indexIDs[k] = next
return next
}
func (e *elementIDAlloc) allocForPhysicalID(tableID int64) int64 {
if e.physicalIDs == nil {
e.physicalIDs = make(map[int64]int64)
}
if id, found := e.physicalIDs[tableID]; found {
return id
}
next := int64(len(e.physicalIDs) + len(e.indexIDs) + 1)
e.physicalIDs[tableID] = next
return next
}
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