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lightning: refactor to better reuse in load data (#42038)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| // Copyright 2023 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 common | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/tidb/kv" | ||
| "github.com/pingcap/tidb/meta/autoid" | ||
| "github.com/pingcap/tidb/parser/model" | ||
| ) | ||
|
|
||
| const ( | ||
| IndexEngineID = -1 | ||
| ) | ||
|
|
||
| func AllocGlobalAutoID(ctx context.Context, n int64, store kv.Storage, dbID int64, tblInfo *model.TableInfo) (autoIDBase, autoIDMax int64, err error) { | ||
| alloc, err := getGlobalAutoIDAlloc(store, dbID, tblInfo) | ||
| if err != nil { | ||
| return 0, 0, err | ||
| } | ||
| return alloc.Alloc(ctx, uint64(n), 1, 1) | ||
| } | ||
|
|
||
| func RebaseGlobalAutoID(ctx context.Context, newBase int64, store kv.Storage, dbID int64, tblInfo *model.TableInfo) error { | ||
| alloc, err := getGlobalAutoIDAlloc(store, dbID, tblInfo) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return alloc.Rebase(ctx, newBase, false) | ||
| } | ||
|
|
||
| func getGlobalAutoIDAlloc(store kv.Storage, dbID int64, tblInfo *model.TableInfo) (autoid.Allocator, error) { | ||
| if store == nil { | ||
| return nil, errors.New("internal error: kv store should not be nil") | ||
| } | ||
| if dbID == 0 { | ||
| return nil, errors.New("internal error: dbID should not be 0") | ||
| } | ||
|
|
||
| // We don't need autoid cache here because we allocate all IDs at once. | ||
| // The argument for CustomAutoIncCacheOption is the cache step. Step 1 means no cache, | ||
| // but step 1 will enable an experimental feature, so we use step 2 here. | ||
| // | ||
| // See https://github.com/pingcap/tidb/issues/38442 for more details. | ||
| noCache := autoid.CustomAutoIncCacheOption(2) | ||
| tblVer := autoid.AllocOptionTableInfoVersion(tblInfo.Version) | ||
|
|
||
| hasRowID := TableHasAutoRowID(tblInfo) | ||
| hasAutoIncID := tblInfo.GetAutoIncrementColInfo() != nil | ||
| hasAutoRandID := tblInfo.ContainsAutoRandomBits() | ||
|
|
||
| // Current TiDB has some limitations for auto ID. | ||
| // 1. Auto increment ID and auto row ID are using the same RowID allocator. See https://github.com/pingcap/tidb/issues/982. | ||
| // 2. Auto random column must be a clustered primary key. That is to say, there is no implicit row ID for tables with auto random column. | ||
| // 3. There is at most one auto column in a table. | ||
| // Therefore, we assume there is only one auto column in a table and use RowID allocator if possible. | ||
| switch { | ||
| case hasRowID || hasAutoIncID: | ||
| return autoid.NewAllocator(store, dbID, tblInfo.ID, tblInfo.IsAutoIncColUnsigned(), autoid.RowIDAllocType, noCache, tblVer), nil | ||
| case hasAutoRandID: | ||
| return autoid.NewAllocator(store, dbID, tblInfo.ID, tblInfo.IsAutoRandomBitColUnsigned(), autoid.AutoRandomType, noCache, tblVer), nil | ||
| default: | ||
| return nil, errors.Errorf("internal error: table %s has no auto ID", tblInfo.Name) | ||
| } | ||
| } |
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