146 lines
4.0 KiB
Go
146 lines
4.0 KiB
Go
// Copyright 2023 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 lockstats
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import (
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"context"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/domain"
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"github.com/pingcap/tidb/executor/internal/exec"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/parser/ast"
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"github.com/pingcap/tidb/parser/model"
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"github.com/pingcap/tidb/table/tables"
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"github.com/pingcap/tidb/util/chunk"
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)
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var _ exec.Executor = &LockExec{}
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// LockExec represents a lock statistic executor.
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type LockExec struct {
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exec.BaseExecutor
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// Tables is the list of tables to be locked.
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// It might contain partition names if we are locking partitions.
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// When locking partitions, Tables will only contain one table name.
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Tables []*ast.TableName
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}
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// Next implements the Executor Next interface.
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func (e *LockExec) Next(_ context.Context, _ *chunk.Chunk) error {
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do := domain.GetDomain(e.Ctx())
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h := do.StatsHandle()
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if h == nil {
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return errors.New("Lock Stats: handle is nil")
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}
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if len(e.Tables) == 0 {
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return errors.New("Lock Stats: table should not empty")
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}
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is := do.InfoSchema()
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if e.onlyLockPartitions() {
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tableName := e.Tables[0]
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tid, pidNames, err := populatePartitionIDAndNames(tableName, tableName.PartitionNames, is)
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if err != nil {
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return err
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}
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msg, err := h.LockPartitions(tid, tableName, pidNames)
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if err != nil {
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return err
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}
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if msg != "" {
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e.Ctx().GetSessionVars().StmtCtx.AppendWarning(errors.New(msg))
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}
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} else {
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tids, pids, err := populateTableAndPartitionIDs(e.Tables, is)
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if err != nil {
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return err
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}
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msg, err := h.LockTables(tids, pids, e.Tables)
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if err != nil {
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return err
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}
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if msg != "" {
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e.Ctx().GetSessionVars().StmtCtx.AppendWarning(errors.New(msg))
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}
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}
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return nil
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}
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func (e *LockExec) onlyLockPartitions() bool {
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return len(e.Tables) == 1 && len(e.Tables[0].PartitionNames) > 0
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}
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// Close implements the Executor Close interface.
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func (*LockExec) Close() error {
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return nil
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}
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// Open implements the Executor Open interface.
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func (*LockExec) Open(context.Context) error {
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return nil
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}
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// populatePartitionIDAndNames returns the table ID and partition IDs for the given table name and partition names.
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func populatePartitionIDAndNames(tableName *ast.TableName, partitionNames []model.CIStr, is infoschema.InfoSchema) (int64, map[int64]string, error) {
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tbl, err := is.TableByName(tableName.Schema, tableName.Name)
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if err != nil {
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return 0, nil, err
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}
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pi := tbl.Meta().GetPartitionInfo()
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if pi == nil {
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return 0, nil, errors.Errorf("table %s is not a partition table", tableName.Name)
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}
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pidNames := make(map[int64]string, len(partitionNames))
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for _, partitionName := range partitionNames {
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pid, err := tables.FindPartitionByName(tbl.Meta(), partitionName.L)
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if err != nil {
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return 0, nil, err
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}
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pidNames[pid] = partitionName.L
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}
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return tbl.Meta().ID, pidNames, nil
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}
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// populateTableAndPartitionIDs returns table IDs and partition IDs for the given table names.
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func populateTableAndPartitionIDs(tables []*ast.TableName, is infoschema.InfoSchema) ([]int64, []int64, error) {
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tids := make([]int64, 0, len(tables))
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pids := make([]int64, 0)
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for _, table := range tables {
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tbl, err := is.TableByName(table.Schema, table.Name)
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if err != nil {
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return nil, nil, err
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}
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tids = append(tids, tbl.Meta().ID)
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pi := tbl.Meta().GetPartitionInfo()
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if pi == nil {
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continue
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}
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for _, p := range pi.Definitions {
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pids = append(pids, p.ID)
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}
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}
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return tids, pids, nil
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}
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