tidb show 源码
tidb show 代码
文件路径：/executor/show.go
// 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 executor
import (
"bytes"
"context"
gjson "encoding/json"
"fmt"
"sort"
"strconv"
"strings"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/bindinfo"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/ddl"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/domain/infosync"
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/meta/autoid"
"github.com/pingcap/tidb/parser"
"github.com/pingcap/tidb/parser/ast"
"github.com/pingcap/tidb/parser/auth"
"github.com/pingcap/tidb/parser/charset"
"github.com/pingcap/tidb/parser/model"
"github.com/pingcap/tidb/parser/mysql"
"github.com/pingcap/tidb/parser/terror"
field_types "github.com/pingcap/tidb/parser/types"
plannercore "github.com/pingcap/tidb/planner/core"
"github.com/pingcap/tidb/plugin"
"github.com/pingcap/tidb/privilege"
"github.com/pingcap/tidb/privilege/privileges"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/sessionstates"
"github.com/pingcap/tidb/sessionctx/stmtctx"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/store/helper"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/table/tables"
"github.com/pingcap/tidb/tidb-binlog/node"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util"
"github.com/pingcap/tidb/util/chunk"
"github.com/pingcap/tidb/util/collate"
"github.com/pingcap/tidb/util/etcd"
"github.com/pingcap/tidb/util/format"
"github.com/pingcap/tidb/util/hack"
"github.com/pingcap/tidb/util/hint"
"github.com/pingcap/tidb/util/mathutil"
"github.com/pingcap/tidb/util/memory"
"github.com/pingcap/tidb/util/sem"
"github.com/pingcap/tidb/util/set"
"github.com/pingcap/tidb/util/sqlexec"
"github.com/pingcap/tidb/util/stringutil"
"golang.org/x/exp/slices"
)
var etcdDialTimeout = 5 * time.Second
// ShowExec represents a show executor.
type ShowExec struct {
baseExecutor
Tp ast.ShowStmtType // Databases/Tables/Columns/....
DBName model.CIStr
Table *ast.TableName // Used for showing columns.
Partition model.CIStr // Used for showing partition
Column *ast.ColumnName // Used for `desc table column`.
IndexName model.CIStr // Used for show table regions.
Flag int // Some flag parsed from sql, such as FULL.
Roles []*auth.RoleIdentity // Used for show grants.
User *auth.UserIdentity // Used by show grants, show create user.
Extractor plannercore.ShowPredicateExtractor
is infoschema.InfoSchema
CountWarningsOrErrors bool // Used for showing count(*) warnings | errors
result *chunk.Chunk
cursor int
Full bool
IfNotExists bool // Used for `show create database if not exists`
GlobalScope bool // GlobalScope is used by show variables
Extended bool // Used for `show extended columns from ...`
}
type showTableRegionRowItem struct {
regionMeta
schedulingConstraints string
schedulingState string
}
// Next implements the Executor Next interface.
func (e *ShowExec) Next(ctx context.Context, req *chunk.Chunk) error {
req.GrowAndReset(e.maxChunkSize)
if e.result == nil {
e.result = newFirstChunk(e)
err := e.fetchAll(ctx)
if err != nil {
return errors.Trace(err)
}
iter := chunk.NewIterator4Chunk(e.result)
for colIdx := 0; colIdx < e.Schema().Len(); colIdx++ {
retType := e.Schema().Columns[colIdx].RetType
if !types.IsTypeVarchar(retType.GetType()) {
continue
}
for row := iter.Begin(); row != iter.End(); row = iter.Next() {
if valLen := len(row.GetString(colIdx)); retType.GetFlen() < valLen {
retType.SetFlen(valLen)
}
}
}
}
if e.cursor >= e.result.NumRows() {
return nil
}
numCurBatch := mathutil.Min(req.Capacity(), e.result.NumRows()-e.cursor)
req.Append(e.result, e.cursor, e.cursor+numCurBatch)
e.cursor += numCurBatch
return nil
}
func (e *ShowExec) fetchAll(ctx context.Context) error {
switch e.Tp {
case ast.ShowCharset:
return e.fetchShowCharset()
case ast.ShowCollation:
return e.fetchShowCollation()
case ast.ShowColumns:
return e.fetchShowColumns(ctx)
case ast.ShowConfig:
return e.fetchShowClusterConfigs(ctx)
case ast.ShowCreateTable:
return e.fetchShowCreateTable()
case ast.ShowCreateSequence:
return e.fetchShowCreateSequence()
case ast.ShowCreateUser:
return e.fetchShowCreateUser(ctx)
case ast.ShowCreateView:
return e.fetchShowCreateView()
case ast.ShowCreateDatabase:
return e.fetchShowCreateDatabase()
case ast.ShowCreatePlacementPolicy:
return e.fetchShowCreatePlacementPolicy()
case ast.ShowDatabases:
return e.fetchShowDatabases()
case ast.ShowDrainerStatus:
return e.fetchShowPumpOrDrainerStatus(node.DrainerNode)
case ast.ShowEngines:
return e.fetchShowEngines(ctx)
case ast.ShowGrants:
return e.fetchShowGrants()
case ast.ShowIndex:
return e.fetchShowIndex()
case ast.ShowProcedureStatus:
return e.fetchShowProcedureStatus()
case ast.ShowPumpStatus:
return e.fetchShowPumpOrDrainerStatus(node.PumpNode)
case ast.ShowStatus:
return e.fetchShowStatus()
case ast.ShowTables:
return e.fetchShowTables()
case ast.ShowOpenTables:
return e.fetchShowOpenTables()
case ast.ShowTableStatus:
return e.fetchShowTableStatus(ctx)
case ast.ShowTriggers:
return e.fetchShowTriggers()
case ast.ShowVariables:
return e.fetchShowVariables()
case ast.ShowWarnings:
return e.fetchShowWarnings(false)
case ast.ShowErrors:
return e.fetchShowWarnings(true)
case ast.ShowProcessList:
return e.fetchShowProcessList()
case ast.ShowEvents:
// empty result
case ast.ShowStatsExtended:
return e.fetchShowStatsExtended()
case ast.ShowStatsMeta:
return e.fetchShowStatsMeta()
case ast.ShowStatsHistograms:
return e.fetchShowStatsHistogram()
case ast.ShowStatsBuckets:
return e.fetchShowStatsBuckets()
case ast.ShowStatsTopN:
return e.fetchShowStatsTopN()
case ast.ShowStatsHealthy:
e.fetchShowStatsHealthy()
return nil
case ast.ShowHistogramsInFlight:
e.fetchShowHistogramsInFlight()
return nil
case ast.ShowColumnStatsUsage:
return e.fetchShowColumnStatsUsage()
case ast.ShowPlugins:
return e.fetchShowPlugins()
case ast.ShowProfiles:
// empty result
case ast.ShowMasterStatus:
return e.fetchShowMasterStatus()
case ast.ShowPrivileges:
return e.fetchShowPrivileges()
case ast.ShowBindings:
return e.fetchShowBind()
case ast.ShowBindingCacheStatus:
return e.fetchShowBindingCacheStatus(ctx)
case ast.ShowAnalyzeStatus:
return e.fetchShowAnalyzeStatus()
case ast.ShowRegions:
return e.fetchShowTableRegions(ctx)
case ast.ShowBuiltins:
return e.fetchShowBuiltins()
case ast.ShowBackups:
return e.fetchShowBRIE(ast.BRIEKindBackup)
case ast.ShowRestores:
return e.fetchShowBRIE(ast.BRIEKindRestore)
case ast.ShowPlacementLabels:
return e.fetchShowPlacementLabels(ctx)
case ast.ShowPlacement:
return e.fetchShowPlacement(ctx)
case ast.ShowPlacementForDatabase:
return e.fetchShowPlacementForDB(ctx)
case ast.ShowPlacementForTable:
return e.fetchShowPlacementForTable(ctx)
case ast.ShowPlacementForPartition:
return e.fetchShowPlacementForPartition(ctx)
case ast.ShowSessionStates:
return e.fetchShowSessionStates(ctx)
}
return nil
}
// visibleChecker checks if a stmt is visible for a certain user.
type visibleChecker struct {
defaultDB string
ctx sessionctx.Context
is infoschema.InfoSchema
manager privilege.Manager
ok bool
}
func (v *visibleChecker) Enter(in ast.Node) (out ast.Node, skipChildren bool) {
switch x := in.(type) {
case *ast.TableName:
schema := x.Schema.L
if schema == "" {
schema = v.defaultDB
}
if !v.is.TableExists(model.NewCIStr(schema), x.Name) {
return in, true
}
activeRoles := v.ctx.GetSessionVars().ActiveRoles
if v.manager != nil && !v.manager.RequestVerification(activeRoles, schema, x.Name.L, "", mysql.SelectPriv) {
v.ok = false
}
return in, true
}
return in, false
}
func (v *visibleChecker) Leave(in ast.Node) (out ast.Node, ok bool) {
return in, true
}
func (e *ShowExec) fetchShowBind() error {
var bindRecords []*bindinfo.BindRecord
if !e.GlobalScope {
handle := e.ctx.Value(bindinfo.SessionBindInfoKeyType).(*bindinfo.SessionHandle)
bindRecords = handle.GetAllBindRecord()
} else {
bindRecords = domain.GetDomain(e.ctx).BindHandle().GetAllBindRecord()
}
// Remove the invalid bindRecord.
ind := 0
for _, bindData := range bindRecords {
if len(bindData.Bindings) > 0 {
bindRecords[ind] = bindData
ind++
}
}
bindRecords = bindRecords[:ind]
parser := parser.New()
for _, bindData := range bindRecords {
// For the same origin_sql, sort the bindings according to their update time.
sort.Slice(bindData.Bindings, func(i int, j int) bool {
cmpResult := bindData.Bindings[i].UpdateTime.Compare(bindData.Bindings[j].UpdateTime)
if cmpResult == 0 {
// Because the create time must be different, the result of sorting is stable.
cmpResult = bindData.Bindings[i].CreateTime.Compare(bindData.Bindings[j].CreateTime)
}
return cmpResult > 0
})
}
// For the different origin_sql, sort the bindRecords according to their max update time.
sort.Slice(bindRecords, func(i int, j int) bool {
cmpResult := bindRecords[i].Bindings[0].UpdateTime.Compare(bindRecords[j].Bindings[0].UpdateTime)
if cmpResult == 0 {
// Because the create time must be different, the result of sorting is stable.
cmpResult = bindRecords[i].Bindings[0].CreateTime.Compare(bindRecords[j].Bindings[0].CreateTime)
}
return cmpResult > 0
})
for _, bindData := range bindRecords {
for _, hint := range bindData.Bindings {
stmt, err := parser.ParseOneStmt(hint.BindSQL, hint.Charset, hint.Collation)
if err != nil {
return err
}
checker := visibleChecker{
defaultDB: bindData.Db,
ctx: e.ctx,
is: e.is,
manager: privilege.GetPrivilegeManager(e.ctx),
ok: true,
}
stmt.Accept(&checker)
if !checker.ok {
continue
}
e.appendRow([]interface{}{
bindData.OriginalSQL,
hint.BindSQL,
bindData.Db,
hint.Status,
hint.CreateTime,
hint.UpdateTime,
hint.Charset,
hint.Collation,
hint.Source,
})
}
}
return nil
}
func (e *ShowExec) fetchShowBindingCacheStatus(ctx context.Context) error {
exec := e.ctx.(sqlexec.RestrictedSQLExecutor)
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnBindInfo)
rows, _, err := exec.ExecRestrictedSQL(ctx, nil, fmt.Sprintf("SELECT count(*) FROM mysql.bind_info where status = '%s' or status = '%s';", bindinfo.Enabled, bindinfo.Using))
if err != nil {
return errors.Trace(err)
}
handle := domain.GetDomain(e.ctx).BindHandle()
bindRecords := handle.GetAllBindRecord()
numBindings := 0
for _, bindRecord := range bindRecords {
for _, binding := range bindRecord.Bindings {
if binding.IsBindingEnabled() {
numBindings++
}
}
}
memUsage := handle.GetMemUsage()
memCapacity := handle.GetMemCapacity()
e.appendRow([]interface{}{
numBindings,
rows[0].GetInt64(0),
memory.FormatBytes(memUsage),
memory.FormatBytes(memCapacity),
})
return nil
}
func (e *ShowExec) fetchShowEngines(ctx context.Context) error {
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnMeta)
exec := e.ctx.(sqlexec.RestrictedSQLExecutor)
rows, _, err := exec.ExecRestrictedSQL(ctx, nil, `SELECT * FROM information_schema.engines`)
if err != nil {
return errors.Trace(err)
}
e.result.AppendRows(rows)
return nil
}
// moveInfoSchemaToFront moves information_schema to the first, and the others are sorted in the origin ascending order.
func moveInfoSchemaToFront(dbs []string) {
if len(dbs) > 0 && strings.EqualFold(dbs[0], "INFORMATION_SCHEMA") {
return
}
i := sort.SearchStrings(dbs, "INFORMATION_SCHEMA")
if i < len(dbs) && strings.EqualFold(dbs[i], "INFORMATION_SCHEMA") {
copy(dbs[1:i+1], dbs[0:i])
dbs[0] = "INFORMATION_SCHEMA"
}
}
func (e *ShowExec) fetchShowDatabases() error {
dbs := e.is.AllSchemaNames()
checker := privilege.GetPrivilegeManager(e.ctx)
slices.Sort(dbs)
var (
fieldPatternsLike collate.WildcardPattern
fieldFilter string
)
if e.Extractor != nil {
fieldFilter = e.Extractor.Field()
fieldPatternsLike = e.Extractor.FieldPatternLike()
}
// let information_schema be the first database
moveInfoSchemaToFront(dbs)
for _, d := range dbs {
if checker != nil && !checker.DBIsVisible(e.ctx.GetSessionVars().ActiveRoles, d) {
continue
} else if fieldFilter != "" && strings.ToLower(d) != fieldFilter {
continue
} else if fieldPatternsLike != nil && !fieldPatternsLike.DoMatch(strings.ToLower(d)) {
continue
}
e.appendRow([]interface{}{
d,
})
}
return nil
}
func (e *ShowExec) fetchShowProcessList() error {
sm := e.ctx.GetSessionManager()
if sm == nil {
return nil
}
loginUser, activeRoles := e.ctx.GetSessionVars().User, e.ctx.GetSessionVars().ActiveRoles
var hasProcessPriv bool
if pm := privilege.GetPrivilegeManager(e.ctx); pm != nil {
if pm.RequestVerification(activeRoles, "", "", "", mysql.ProcessPriv) {
hasProcessPriv = true
}
}
pl := sm.ShowProcessList()
for _, pi := range pl {
// If you have the PROCESS privilege, you can see all threads.
// Otherwise, you can see only your own threads.
if !hasProcessPriv && pi.User != loginUser.Username {
continue
}
row := pi.ToRowForShow(e.Full)
e.appendRow(row)
}
return nil
}
func (e *ShowExec) fetchShowOpenTables() error {
// TiDB has no concept like mysql's "table cache" and "open table"
// For simplicity, we just return an empty result with the same structure as MySQL's SHOW OPEN TABLES
return nil
}
func (e *ShowExec) fetchShowTables() error {
checker := privilege.GetPrivilegeManager(e.ctx)
if checker != nil && e.ctx.GetSessionVars().User != nil {
if !checker.DBIsVisible(e.ctx.GetSessionVars().ActiveRoles, e.DBName.O) {
return e.dbAccessDenied()
}
}
if !e.is.SchemaExists(e.DBName) {
return ErrBadDB.GenWithStackByArgs(e.DBName)
}
// sort for tables
schemaTables := e.is.SchemaTables(e.DBName)
tableNames := make([]string, 0, len(schemaTables))
activeRoles := e.ctx.GetSessionVars().ActiveRoles
var (
tableTypes = make(map[string]string)
fieldPatternsLike collate.WildcardPattern
fieldFilter string
)
if e.Extractor != nil {
fieldFilter = e.Extractor.Field()
fieldPatternsLike = e.Extractor.FieldPatternLike()
}
for _, v := range schemaTables {
// Test with mysql.AllPrivMask means any privilege would be OK.
// TODO: Should consider column privileges, which also make a table visible.
if checker != nil && !checker.RequestVerification(activeRoles, e.DBName.O, v.Meta().Name.O, "", mysql.AllPrivMask) {
continue
} else if fieldFilter != "" && v.Meta().Name.L != fieldFilter {
continue
} else if fieldPatternsLike != nil && !fieldPatternsLike.DoMatch(v.Meta().Name.L) {
continue
}
tableNames = append(tableNames, v.Meta().Name.O)
if v.Meta().IsView() {
tableTypes[v.Meta().Name.O] = "VIEW"
} else if v.Meta().IsSequence() {
tableTypes[v.Meta().Name.O] = "SEQUENCE"
} else if util.IsSystemView(e.DBName.L) {
tableTypes[v.Meta().Name.O] = "SYSTEM VIEW"
} else {
tableTypes[v.Meta().Name.O] = "BASE TABLE"
}
}
slices.Sort(tableNames)
for _, v := range tableNames {
if e.Full {
e.appendRow([]interface{}{v, tableTypes[v]})
} else {
e.appendRow([]interface{}{v})
}
}
return nil
}
func (e *ShowExec) fetchShowTableStatus(ctx context.Context) error {
checker := privilege.GetPrivilegeManager(e.ctx)
if checker != nil && e.ctx.GetSessionVars().User != nil {
if !checker.DBIsVisible(e.ctx.GetSessionVars().ActiveRoles, e.DBName.O) {
return e.dbAccessDenied()
}
}
if !e.is.SchemaExists(e.DBName) {
return ErrBadDB.GenWithStackByArgs(e.DBName)
}
exec := e.ctx.(sqlexec.RestrictedSQLExecutor)
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnStats)
var snapshot uint64
txn, err := e.ctx.Txn(false)
if err != nil {
return errors.Trace(err)
}
if txn.Valid() {
snapshot = txn.StartTS()
}
if e.ctx.GetSessionVars().SnapshotTS != 0 {
snapshot = e.ctx.GetSessionVars().SnapshotTS
}
rows, _, err := exec.ExecRestrictedSQL(ctx, []sqlexec.OptionFuncAlias{sqlexec.ExecOptionWithSnapshot(snapshot), sqlexec.ExecOptionUseCurSession},
`SELECT table_name, engine, version, row_format, table_rows,
avg_row_length, data_length, max_data_length, index_length,
data_free, auto_increment, create_time, update_time, check_time,
table_collation, IFNULL(checksum,''), create_options, table_comment
FROM information_schema.tables
WHERE lower(table_schema)=%? ORDER BY table_name`, e.DBName.L)
if err != nil {
return errors.Trace(err)
}
var (
fieldPatternsLike collate.WildcardPattern
fieldFilter string
)
if e.Extractor != nil {
fieldFilter = e.Extractor.Field()
fieldPatternsLike = e.Extractor.FieldPatternLike()
}
activeRoles := e.ctx.GetSessionVars().ActiveRoles
for _, row := range rows {
tableName := row.GetString(0)
if checker != nil && !checker.RequestVerification(activeRoles, e.DBName.O, tableName, "", mysql.AllPrivMask) {
continue
} else if fieldFilter != "" && strings.ToLower(tableName) != fieldFilter {
continue
} else if fieldPatternsLike != nil && !fieldPatternsLike.DoMatch(strings.ToLower(tableName)) {
continue
}
e.result.AppendRow(row)
}
return nil
}
func (e *ShowExec) fetchShowColumns(ctx context.Context) error {
tb, err := e.getTable()
if err != nil {
return errors.Trace(err)
}
var (
fieldPatternsLike collate.WildcardPattern
fieldFilter string
)
if e.Extractor != nil {
fieldFilter = e.Extractor.Field()
fieldPatternsLike = e.Extractor.FieldPatternLike()
}
checker := privilege.GetPrivilegeManager(e.ctx)
activeRoles := e.ctx.GetSessionVars().ActiveRoles
if checker != nil && e.ctx.GetSessionVars().User != nil && !checker.RequestVerification(activeRoles, e.DBName.O, tb.Meta().Name.O, "", mysql.InsertPriv|mysql.SelectPriv|mysql.UpdatePriv|mysql.ReferencesPriv) {
return e.tableAccessDenied("SELECT", tb.Meta().Name.O)
}
var cols []*table.Column
// The optional EXTENDED keyword causes the output to include information about hidden columns that MySQL uses internally and are not accessible by users.
// See https://dev.mysql.com/doc/refman/8.0/en/show-columns.html
if e.Extended {
cols = tb.Cols()
} else {
cols = tb.VisibleCols()
}
if err := tryFillViewColumnType(ctx, e.ctx, e.is, e.DBName, tb.Meta()); err != nil {
return err
}
for _, col := range cols {
if fieldFilter != "" && col.Name.L != fieldFilter {
continue
} else if fieldPatternsLike != nil && !fieldPatternsLike.DoMatch(col.Name.L) {
continue
}
desc := table.NewColDesc(col)
var columnDefault interface{}
if desc.DefaultValue != nil {
// SHOW COLUMNS result expects string value
defaultValStr := fmt.Sprintf("%v", desc.DefaultValue)
// If column is timestamp, and default value is not current_timestamp, should convert the default value to the current session time zone.
if col.GetType() == mysql.TypeTimestamp && defaultValStr != types.ZeroDatetimeStr && !strings.HasPrefix(strings.ToUpper(defaultValStr), strings.ToUpper(ast.CurrentTimestamp)) {
timeValue, err := table.GetColDefaultValue(e.ctx, col.ToInfo())
if err != nil {
return errors.Trace(err)
}
defaultValStr = timeValue.GetMysqlTime().String()
}
if col.GetType() == mysql.TypeBit {
defaultValBinaryLiteral := types.BinaryLiteral(defaultValStr)
columnDefault = defaultValBinaryLiteral.ToBitLiteralString(true)
} else {
columnDefault = defaultValStr
}
}
// The FULL keyword causes the output to include the column collation and comments,
// as well as the privileges you have for each column.
if e.Full {
e.appendRow([]interface{}{
desc.Field,
desc.Type,
desc.Collation,
desc.Null,
desc.Key,
columnDefault,
desc.Extra,
desc.Privileges,
desc.Comment,
})
} else {
e.appendRow([]interface{}{
desc.Field,
desc.Type,
desc.Null,
desc.Key,
columnDefault,
desc.Extra,
})
}
}
return nil
}
func (e *ShowExec) fetchShowIndex() error {
tb, err := e.getTable()
if err != nil {
return errors.Trace(err)
}
checker := privilege.GetPrivilegeManager(e.ctx)
activeRoles := e.ctx.GetSessionVars().ActiveRoles
if checker != nil && e.ctx.GetSessionVars().User != nil && !checker.RequestVerification(activeRoles, e.DBName.O, tb.Meta().Name.O, "", mysql.AllPrivMask) {
return e.tableAccessDenied("SELECT", tb.Meta().Name.O)
}
if tb.Meta().PKIsHandle {
var pkCol *table.Column
for _, col := range tb.Cols() {
if mysql.HasPriKeyFlag(col.GetFlag()) {
pkCol = col
break
}
}
e.appendRow([]interface{}{
tb.Meta().Name.O, // Table
0, // Non_unique
"PRIMARY", // Key_name
1, // Seq_in_index
pkCol.Name.O, // Column_name
"A", // Collation
0, // Cardinality
nil, // Sub_part
nil, // Packed
"", // Null
"BTREE", // Index_type
"", // Comment
"", // Index_comment
"YES", // Index_visible
nil, // Expression
"YES", // Clustered
})
}
for _, idx := range tb.Indices() {
idxInfo := idx.Meta()
if idxInfo.State != model.StatePublic {
continue
}
isClustered := "NO"
if tb.Meta().IsCommonHandle && idxInfo.Primary {
isClustered = "YES"
}
for i, col := range idxInfo.Columns {
nonUniq := 1
if idx.Meta().Unique {
nonUniq = 0
}
var subPart interface{}
if col.Length != types.UnspecifiedLength {
subPart = col.Length
}
tblCol := tb.Meta().Columns[col.Offset]
nullVal := "YES"
if mysql.HasNotNullFlag(tblCol.GetFlag()) {
nullVal = ""
}
visible := "YES"
if idx.Meta().Invisible {
visible = "NO"
}
colName := col.Name.O
var expression interface{}
if tblCol.Hidden {
colName = "NULL"
expression = tblCol.GeneratedExprString
}
e.appendRow([]interface{}{
tb.Meta().Name.O, // Table
nonUniq, // Non_unique
idx.Meta().Name.O, // Key_name
i + 1, // Seq_in_index
colName, // Column_name
"A", // Collation
0, // Cardinality
subPart, // Sub_part
nil, // Packed
nullVal, // Null
idx.Meta().Tp.String(), // Index_type
"", // Comment
idx.Meta().Comment, // Index_comment
visible, // Index_visible
expression, // Expression
isClustered, // Clustered
})
}
}
return nil
}
// fetchShowCharset gets all charset information and fill them into e.rows.
// See http://dev.mysql.com/doc/refman/5.7/en/show-character-set.html
func (e *ShowExec) fetchShowCharset() error {
descs := charset.GetSupportedCharsets()
for _, desc := range descs {
e.appendRow([]interface{}{
desc.Name,
desc.Desc,
desc.DefaultCollation,
desc.Maxlen,
})
}
return nil
}
func (e *ShowExec) fetchShowMasterStatus() error {
tso := e.ctx.GetSessionVars().TxnCtx.StartTS
e.appendRow([]interface{}{"tidb-binlog", tso, "", "", ""})
return nil
}
func (e *ShowExec) fetchShowVariables() (err error) {
var (
value string
sessionVars = e.ctx.GetSessionVars()
)
var (
fieldPatternsLike collate.WildcardPattern
fieldFilter string
)
if e.Extractor != nil {
fieldFilter = e.Extractor.Field()
fieldPatternsLike = e.Extractor.FieldPatternLike()
}
if e.GlobalScope {
// Collect global scope variables,
// 1. Exclude the variables of ScopeSession in variable.SysVars;
// 2. If the variable is ScopeNone, it's a read-only variable, return the default value of it,
// otherwise, fetch the value from table `mysql.Global_Variables`.
for _, v := range variable.GetSysVars() {
if v.Scope != variable.ScopeSession {
if v.IsNoop && !variable.EnableNoopVariables.Load() {
continue
}
if fieldFilter != "" && v.Name != fieldFilter {
continue
} else if fieldPatternsLike != nil && !fieldPatternsLike.DoMatch(v.Name) {
continue
}
if infoschema.SysVarHiddenForSem(e.ctx, v.Name) {
continue
}
value, err = sessionVars.GetGlobalSystemVar(v.Name)
if err != nil {
return errors.Trace(err)
}
e.appendRow([]interface{}{v.Name, value})
}
}
return nil
}
// Collect session scope variables,
// If it is a session only variable, use the default value defined in code,
// otherwise, fetch the value from table `mysql.Global_Variables`.
for _, v := range variable.GetSysVars() {
if v.IsNoop && !variable.EnableNoopVariables.Load() {
continue
}
if fieldFilter != "" && v.Name != fieldFilter {
continue
} else if fieldPatternsLike != nil && !fieldPatternsLike.DoMatch(v.Name) {
continue
}
if infoschema.SysVarHiddenForSem(e.ctx, v.Name) {
continue
}
value, err = sessionVars.GetSessionOrGlobalSystemVar(v.Name)
if err != nil {
return errors.Trace(err)
}
e.appendRow([]interface{}{v.Name, value})
}
return nil
}
func (e *ShowExec) fetchShowStatus() error {
sessionVars := e.ctx.GetSessionVars()
statusVars, err := variable.GetStatusVars(sessionVars)
if err != nil {
return errors.Trace(err)
}
checker := privilege.GetPrivilegeManager(e.ctx)
for status, v := range statusVars {
if e.GlobalScope && v.Scope == variable.ScopeSession {
continue
}
// Skip invisible status vars if permission fails.
if sem.IsEnabled() && sem.IsInvisibleStatusVar(status) {
if checker == nil || !checker.RequestDynamicVerification(sessionVars.ActiveRoles, "RESTRICTED_STATUS_ADMIN", false) {
continue
}
}
switch v.Value.(type) {
case []interface{}, nil:
v.Value = fmt.Sprintf("%v", v.Value)
}
value, err := types.ToString(v.Value)
if err != nil {
return errors.Trace(err)
}
e.appendRow([]interface{}{status, value})
}
return nil
}
func getDefaultCollate(charsetName string) string {
ch, err := charset.GetCharsetInfo(charsetName)
if err != nil {
// The charset is invalid, return server default.
return mysql.DefaultCollationName
}
return ch.DefaultCollation
}
// ConstructResultOfShowCreateTable constructs the result for show create table.
func ConstructResultOfShowCreateTable(ctx sessionctx.Context, tableInfo *model.TableInfo, allocators autoid.Allocators, buf *bytes.Buffer) (err error) {
if tableInfo.IsView() {
fetchShowCreateTable4View(ctx, tableInfo, buf)
return nil
}
if tableInfo.IsSequence() {
ConstructResultOfShowCreateSequence(ctx, tableInfo, buf)
return nil
}
tblCharset := tableInfo.Charset
if len(tblCharset) == 0 {
tblCharset = mysql.DefaultCharset
}
tblCollate := tableInfo.Collate
// Set default collate if collate is not specified.
if len(tblCollate) == 0 {
tblCollate = getDefaultCollate(tblCharset)
}
sqlMode := ctx.GetSessionVars().SQLMode
tableName := stringutil.Escape(tableInfo.Name.O, sqlMode)
switch tableInfo.TempTableType {
case model.TempTableGlobal:
fmt.Fprintf(buf, "CREATE GLOBAL TEMPORARY TABLE %s (\n", tableName)
case model.TempTableLocal:
fmt.Fprintf(buf, "CREATE TEMPORARY TABLE %s (\n", tableName)
default:
fmt.Fprintf(buf, "CREATE TABLE %s (\n", tableName)
}
var pkCol *model.ColumnInfo
var hasAutoIncID bool
needAddComma := false
for i, col := range tableInfo.Cols() {
if col.Hidden {
continue
}
if needAddComma {
buf.WriteString(",\n")
}
fmt.Fprintf(buf, " %s %s", stringutil.Escape(col.Name.O, sqlMode), col.GetTypeDesc())
if field_types.HasCharset(&col.FieldType) {
if col.GetCharset() != tblCharset {
fmt.Fprintf(buf, " CHARACTER SET %s", col.GetCharset())
}
if col.GetCollate() != tblCollate {
fmt.Fprintf(buf, " COLLATE %s", col.GetCollate())
} else {
defcol, err := charset.GetDefaultCollation(col.GetCharset())
if err == nil && defcol != col.GetCollate() {
fmt.Fprintf(buf, " COLLATE %s", col.GetCollate())
}
}
}
if col.IsGenerated() {
// It's a generated column.
fmt.Fprintf(buf, " GENERATED ALWAYS AS (%s)", col.GeneratedExprString)
if col.GeneratedStored {
buf.WriteString(" STORED")
} else {
buf.WriteString(" VIRTUAL")
}
}
if mysql.HasAutoIncrementFlag(col.GetFlag()) {
hasAutoIncID = true
buf.WriteString(" NOT NULL AUTO_INCREMENT")
} else {
if mysql.HasNotNullFlag(col.GetFlag()) {
buf.WriteString(" NOT NULL")
}
// default values are not shown for generated columns in MySQL
if !mysql.HasNoDefaultValueFlag(col.GetFlag()) && !col.IsGenerated() {
defaultValue := col.GetDefaultValue()
switch defaultValue {
case nil:
if !mysql.HasNotNullFlag(col.GetFlag()) {
if col.GetType() == mysql.TypeTimestamp {
buf.WriteString(" NULL")
}
buf.WriteString(" DEFAULT NULL")
}
case "CURRENT_TIMESTAMP":
buf.WriteString(" DEFAULT CURRENT_TIMESTAMP")
if col.GetDecimal() > 0 {
buf.WriteString(fmt.Sprintf("(%d)", col.GetDecimal()))
}
default:
defaultValStr := fmt.Sprintf("%v", defaultValue)
// If column is timestamp, and default value is not current_timestamp, should convert the default value to the current session time zone.
if col.GetType() == mysql.TypeTimestamp && defaultValStr != types.ZeroDatetimeStr {
timeValue, err := table.GetColDefaultValue(ctx, col)
if err != nil {
return errors.Trace(err)
}
defaultValStr = timeValue.GetMysqlTime().String()
}
if col.DefaultIsExpr {
fmt.Fprintf(buf, " DEFAULT %s", format.OutputFormat(defaultValStr))
} else {
if col.GetType() == mysql.TypeBit {
defaultValBinaryLiteral := types.BinaryLiteral(defaultValStr)
fmt.Fprintf(buf, " DEFAULT %s", defaultValBinaryLiteral.ToBitLiteralString(true))
} else {
fmt.Fprintf(buf, " DEFAULT '%s'", format.OutputFormat(defaultValStr))
}
}
}
}
if mysql.HasOnUpdateNowFlag(col.GetFlag()) {
buf.WriteString(" ON UPDATE CURRENT_TIMESTAMP")
buf.WriteString(table.OptionalFsp(&col.FieldType))
}
}
if ddl.IsAutoRandomColumnID(tableInfo, col.ID) {
s, r := tableInfo.AutoRandomBits, tableInfo.AutoRandomRangeBits
if r == 0 || r == autoid.AutoRandomRangeBitsDefault {
buf.WriteString(fmt.Sprintf(" /*T![auto_rand] AUTO_RANDOM(%d) */", s))
} else {
buf.WriteString(fmt.Sprintf(" /*T![auto_rand] AUTO_RANDOM(%d, %d) */", s, r))
}
}
if len(col.Comment) > 0 {
buf.WriteString(fmt.Sprintf(" COMMENT '%s'", format.OutputFormat(col.Comment)))
}
if i != len(tableInfo.Cols())-1 {
needAddComma = true
}
if tableInfo.PKIsHandle && mysql.HasPriKeyFlag(col.GetFlag()) {
pkCol = col
}
}
if pkCol != nil {
// If PKIsHandle, pk info is not in tb.Indices(). We should handle it here.
buf.WriteString(",\n")
fmt.Fprintf(buf, " PRIMARY KEY (%s)", stringutil.Escape(pkCol.Name.O, sqlMode))
buf.WriteString(" /*T![clustered_index] CLUSTERED */")
}
publicIndices := make([]*model.IndexInfo, 0, len(tableInfo.Indices))
for _, idx := range tableInfo.Indices {
if idx.State == model.StatePublic {
publicIndices = append(publicIndices, idx)
}
}
if len(publicIndices) > 0 {
buf.WriteString(",\n")
}
for i, idxInfo := range publicIndices {
if idxInfo.Primary {
buf.WriteString(" PRIMARY KEY ")
} else if idxInfo.Unique {
fmt.Fprintf(buf, " UNIQUE KEY %s ", stringutil.Escape(idxInfo.Name.O, sqlMode))
} else {
fmt.Fprintf(buf, " KEY %s ", stringutil.Escape(idxInfo.Name.O, sqlMode))
}
cols := make([]string, 0, len(idxInfo.Columns))
var colInfo string
for _, c := range idxInfo.Columns {
if tableInfo.Columns[c.Offset].Hidden {
colInfo = fmt.Sprintf("(%s)", tableInfo.Columns[c.Offset].GeneratedExprString)
} else {
colInfo = stringutil.Escape(c.Name.O, sqlMode)
if c.Length != types.UnspecifiedLength {
colInfo = fmt.Sprintf("%s(%s)", colInfo, strconv.Itoa(c.Length))
}
}
cols = append(cols, colInfo)
}
fmt.Fprintf(buf, "(%s)", strings.Join(cols, ","))
if idxInfo.Invisible {
fmt.Fprintf(buf, ` /*!80000 INVISIBLE */`)
}
if idxInfo.Comment != "" {
fmt.Fprintf(buf, ` COMMENT '%s'`, format.OutputFormat(idxInfo.Comment))
}
if idxInfo.Primary {
if tableInfo.HasClusteredIndex() {
buf.WriteString(" /*T![clustered_index] CLUSTERED */")
} else {
buf.WriteString(" /*T![clustered_index] NONCLUSTERED */")
}
}
if i != len(publicIndices)-1 {
buf.WriteString(",\n")
}
}
// Foreign Keys are supported by data dictionary even though
// they are not enforced by DDL. This is still helpful to applications.
for _, fk := range tableInfo.ForeignKeys {
buf.WriteString(fmt.Sprintf(",\n CONSTRAINT %s FOREIGN KEY ", stringutil.Escape(fk.Name.O, sqlMode)))
colNames := make([]string, 0, len(fk.Cols))
for _, col := range fk.Cols {
colNames = append(colNames, stringutil.Escape(col.O, sqlMode))
}
buf.WriteString(fmt.Sprintf("(%s)", strings.Join(colNames, ",")))
buf.WriteString(fmt.Sprintf(" REFERENCES %s ", stringutil.Escape(fk.RefTable.O, sqlMode)))
refColNames := make([]string, 0, len(fk.Cols))
for _, refCol := range fk.RefCols {
refColNames = append(refColNames, stringutil.Escape(refCol.O, sqlMode))
}
buf.WriteString(fmt.Sprintf("(%s)", strings.Join(refColNames, ",")))
if model.ReferOptionType(fk.OnDelete) != 0 {
buf.WriteString(fmt.Sprintf(" ON DELETE %s", model.ReferOptionType(fk.OnDelete).String()))
}
if model.ReferOptionType(fk.OnUpdate) != 0 {
buf.WriteString(fmt.Sprintf(" ON UPDATE %s", model.ReferOptionType(fk.OnUpdate).String()))
}
}
buf.WriteString("\n")
buf.WriteString(") ENGINE=InnoDB")
// We need to explicitly set the default charset and collation
// to make it work on MySQL server which has default collate utf8_general_ci.
if len(tblCollate) == 0 || tblCollate == "binary" {
// If we can not find default collate for the given charset,
// or the collate is 'binary'(MySQL-5.7 compatibility, see #15633 for details),
// do not show the collate part.
fmt.Fprintf(buf, " DEFAULT CHARSET=%s", tblCharset)
} else {
fmt.Fprintf(buf, " DEFAULT CHARSET=%s COLLATE=%s", tblCharset, tblCollate)
}
// Displayed if the compression typed is set.
if len(tableInfo.Compression) != 0 {
fmt.Fprintf(buf, " COMPRESSION='%s'", tableInfo.Compression)
}
incrementAllocator := allocators.Get(autoid.RowIDAllocType)
if hasAutoIncID && incrementAllocator != nil {
autoIncID, err := incrementAllocator.NextGlobalAutoID()
if err != nil {
return errors.Trace(err)
}
// It's compatible with MySQL.
if autoIncID > 1 {
fmt.Fprintf(buf, " AUTO_INCREMENT=%d", autoIncID)
}
}
if tableInfo.AutoIdCache != 0 {
fmt.Fprintf(buf, " /*T![auto_id_cache] AUTO_ID_CACHE=%d */", tableInfo.AutoIdCache)
}
randomAllocator := allocators.Get(autoid.AutoRandomType)
if randomAllocator != nil {
autoRandID, err := randomAllocator.NextGlobalAutoID()
if err != nil {
return errors.Trace(err)
}
if autoRandID > 1 {
fmt.Fprintf(buf, " /*T![auto_rand_base] AUTO_RANDOM_BASE=%d */", autoRandID)
}
}
if tableInfo.ShardRowIDBits > 0 {
fmt.Fprintf(buf, " /*T! SHARD_ROW_ID_BITS=%d ", tableInfo.ShardRowIDBits)
if tableInfo.PreSplitRegions > 0 {
fmt.Fprintf(buf, "PRE_SPLIT_REGIONS=%d ", tableInfo.PreSplitRegions)
}
buf.WriteString("*/")
}
if len(tableInfo.Comment) > 0 {
fmt.Fprintf(buf, " COMMENT='%s'", format.OutputFormat(tableInfo.Comment))
}
if tableInfo.TempTableType == model.TempTableGlobal {
fmt.Fprintf(buf, " ON COMMIT DELETE ROWS")
}
if tableInfo.PlacementPolicyRef != nil {
fmt.Fprintf(buf, " /*T![placement] PLACEMENT POLICY=%s */", stringutil.Escape(tableInfo.PlacementPolicyRef.Name.String(), sqlMode))
}
if tableInfo.TableCacheStatusType == model.TableCacheStatusEnable {
// This is not meant to be understand by other components, so it's not written as /*T![cached] */
// For all external components, cached table is just a normal table.
fmt.Fprintf(buf, " /* CACHED ON */")
}
// add partition info here.
appendPartitionInfo(tableInfo.Partition, buf, sqlMode)
return nil
}
// ConstructResultOfShowCreateSequence constructs the result for show create sequence.
func ConstructResultOfShowCreateSequence(ctx sessionctx.Context, tableInfo *model.TableInfo, buf *bytes.Buffer) {
sqlMode := ctx.GetSessionVars().SQLMode
fmt.Fprintf(buf, "CREATE SEQUENCE %s ", stringutil.Escape(tableInfo.Name.O, sqlMode))
sequenceInfo := tableInfo.Sequence
fmt.Fprintf(buf, "start with %d ", sequenceInfo.Start)
fmt.Fprintf(buf, "minvalue %d ", sequenceInfo.MinValue)
fmt.Fprintf(buf, "maxvalue %d ", sequenceInfo.MaxValue)
fmt.Fprintf(buf, "increment by %d ", sequenceInfo.Increment)
if sequenceInfo.Cache {
fmt.Fprintf(buf, "cache %d ", sequenceInfo.CacheValue)
} else {
buf.WriteString("nocache ")
}
if sequenceInfo.Cycle {
buf.WriteString("cycle ")
} else {
buf.WriteString("nocycle ")
}
buf.WriteString("ENGINE=InnoDB")
if len(sequenceInfo.Comment) > 0 {
fmt.Fprintf(buf, " COMMENT='%s'", format.OutputFormat(sequenceInfo.Comment))
}
}
func (e *ShowExec) fetchShowCreateSequence() error {
tbl, err := e.getTable()
if err != nil {
return errors.Trace(err)
}
tableInfo := tbl.Meta()
if !tableInfo.IsSequence() {
return ErrWrongObject.GenWithStackByArgs(e.DBName.O, tableInfo.Name.O, "SEQUENCE")
}
var buf bytes.Buffer
ConstructResultOfShowCreateSequence(e.ctx, tableInfo, &buf)
e.appendRow([]interface{}{tableInfo.Name.O, buf.String()})
return nil
}
// TestShowClusterConfigKey is the key used to store TestShowClusterConfigFunc.
var TestShowClusterConfigKey stringutil.StringerStr = "TestShowClusterConfigKey"
// TestShowClusterConfigFunc is used to test 'show config ...'.
type TestShowClusterConfigFunc func() ([][]types.Datum, error)
func (e *ShowExec) fetchShowClusterConfigs(ctx context.Context) error {
emptySet := set.NewStringSet()
var confItems [][]types.Datum
var err error
if f := e.ctx.Value(TestShowClusterConfigKey); f != nil {
confItems, err = f.(TestShowClusterConfigFunc)()
} else {
confItems, err = fetchClusterConfig(e.ctx, emptySet, emptySet)
}
if err != nil {
return err
}
for _, items := range confItems {
row := make([]interface{}, 0, 4)
for _, item := range items {
row = append(row, item.GetString())
}
e.appendRow(row)
}
return nil
}
func (e *ShowExec) fetchShowCreateTable() error {
tb, err := e.getTable()
if err != nil {
return errors.Trace(err)
}
tableInfo := tb.Meta()
var buf bytes.Buffer
// TODO: let the result more like MySQL.
if err = ConstructResultOfShowCreateTable(e.ctx, tableInfo, tb.Allocators(e.ctx), &buf); err != nil {
return err
}
if tableInfo.IsView() {
e.appendRow([]interface{}{tableInfo.Name.O, buf.String(), tableInfo.Charset, tableInfo.Collate})
return nil
}
e.appendRow([]interface{}{tableInfo.Name.O, buf.String()})
return nil
}
func (e *ShowExec) fetchShowCreateView() error {
db, ok := e.is.SchemaByName(e.DBName)
if !ok {
return infoschema.ErrDatabaseNotExists.GenWithStackByArgs(e.DBName.O)
}
tb, err := e.getTable()
if err != nil {
return errors.Trace(err)
}
if !tb.Meta().IsView() {
return ErrWrongObject.GenWithStackByArgs(db.Name.O, tb.Meta().Name.O, "VIEW")
}
var buf bytes.Buffer
fetchShowCreateTable4View(e.ctx, tb.Meta(), &buf)
e.appendRow([]interface{}{tb.Meta().Name.O, buf.String(), tb.Meta().Charset, tb.Meta().Collate})
return nil
}
func fetchShowCreateTable4View(ctx sessionctx.Context, tb *model.TableInfo, buf *bytes.Buffer) {
sqlMode := ctx.GetSessionVars().SQLMode
fmt.Fprintf(buf, "CREATE ALGORITHM=%s ", tb.View.Algorithm.String())
if tb.View.Definer.AuthUsername == "" || tb.View.Definer.AuthHostname == "" {
fmt.Fprintf(buf, "DEFINER=%s@%s ", stringutil.Escape(tb.View.Definer.Username, sqlMode), stringutil.Escape(tb.View.Definer.Hostname, sqlMode))
} else {
fmt.Fprintf(buf, "DEFINER=%s@%s ", stringutil.Escape(tb.View.Definer.AuthUsername, sqlMode), stringutil.Escape(tb.View.Definer.AuthHostname, sqlMode))
}
fmt.Fprintf(buf, "SQL SECURITY %s ", tb.View.Security.String())
fmt.Fprintf(buf, "VIEW %s (", stringutil.Escape(tb.Name.O, sqlMode))
for i, col := range tb.Columns {
fmt.Fprintf(buf, "%s", stringutil.Escape(col.Name.O, sqlMode))
if i < len(tb.Columns)-1 {
fmt.Fprintf(buf, ", ")
}
}
fmt.Fprintf(buf, ") AS %s", tb.View.SelectStmt)
}
func appendPartitionInfo(partitionInfo *model.PartitionInfo, buf *bytes.Buffer, sqlMode mysql.SQLMode) {
if partitionInfo == nil {
return
}
// Since MySQL 5.1/5.5 is very old and TiDB aims for 5.7/8.0 compatibility, we will not
// include the /*!50100 or /*!50500 comments for TiDB.
// This also solves the issue with comments within comments that would happen for
// PLACEMENT POLICY options.
if partitionInfo.Type == model.PartitionTypeHash {
defaultPartitionDefinitions := true
for i, def := range partitionInfo.Definitions {
if def.Name.O != fmt.Sprintf("p%d", i) {
defaultPartitionDefinitions = false
break
}
if len(def.Comment) > 0 || def.PlacementPolicyRef != nil {
defaultPartitionDefinitions = false
break
}
}
if defaultPartitionDefinitions {
fmt.Fprintf(buf, "\nPARTITION BY HASH (%s) PARTITIONS %d", partitionInfo.Expr, partitionInfo.Num)
return
}
}
// this if statement takes care of lists/range columns case
if len(partitionInfo.Columns) > 0 {
// partitionInfo.Type == model.PartitionTypeRange || partitionInfo.Type == model.PartitionTypeList
// Notice that MySQL uses two spaces between LIST and COLUMNS...
fmt.Fprintf(buf, "\nPARTITION BY %s COLUMNS(", partitionInfo.Type.String())
for i, col := range partitionInfo.Columns {
buf.WriteString(stringutil.Escape(col.O, sqlMode))
if i < len(partitionInfo.Columns)-1 {
buf.WriteString(",")
}
}
buf.WriteString(")\n(")
} else {
fmt.Fprintf(buf, "\nPARTITION BY %s (%s)\n(", partitionInfo.Type.String(), partitionInfo.Expr)
}
ddl.AppendPartitionDefs(partitionInfo, buf, sqlMode)
buf.WriteString(")")
}
// ConstructResultOfShowCreateDatabase constructs the result for show create database.
func ConstructResultOfShowCreateDatabase(ctx sessionctx.Context, dbInfo *model.DBInfo, ifNotExists bool, buf *bytes.Buffer) (err error) {
sqlMode := ctx.GetSessionVars().SQLMode
var ifNotExistsStr string
if ifNotExists {
ifNotExistsStr = "IF NOT EXISTS "
}
fmt.Fprintf(buf, "CREATE DATABASE %s%s", ifNotExistsStr, stringutil.Escape(dbInfo.Name.O, sqlMode))
if dbInfo.Charset != "" {
fmt.Fprintf(buf, " /*!40100 DEFAULT CHARACTER SET %s ", dbInfo.Charset)
defaultCollate, err := charset.GetDefaultCollation(dbInfo.Charset)
if err != nil {
return errors.Trace(err)
}
if dbInfo.Collate != "" && dbInfo.Collate != defaultCollate {
fmt.Fprintf(buf, "COLLATE %s ", dbInfo.Collate)
}
fmt.Fprint(buf, "*/")
} else if dbInfo.Collate != "" {
collInfo, err := collate.GetCollationByName(dbInfo.Collate)
if err != nil {
return errors.Trace(err)
}
fmt.Fprintf(buf, " /*!40100 DEFAULT CHARACTER SET %s ", collInfo.CharsetName)
if !collInfo.IsDefault {
fmt.Fprintf(buf, "COLLATE %s ", dbInfo.Collate)
}
fmt.Fprint(buf, "*/")
}
// MySQL 5.7 always show the charset info but TiDB may ignore it, which makes a slight difference. We keep this
// behavior unchanged because it is trivial enough.
if dbInfo.PlacementPolicyRef != nil {
// add placement ref info here
fmt.Fprintf(buf, " /*T![placement] PLACEMENT POLICY=%s */", stringutil.Escape(dbInfo.PlacementPolicyRef.Name.O, sqlMode))
}
return nil
}
// ConstructResultOfShowCreatePlacementPolicy constructs the result for show create placement policy.
func ConstructResultOfShowCreatePlacementPolicy(policyInfo *model.PolicyInfo) string {
return fmt.Sprintf("CREATE PLACEMENT POLICY `%s` %s", policyInfo.Name.O, policyInfo.PlacementSettings.String())
}
// fetchShowCreateDatabase composes show create database result.
func (e *ShowExec) fetchShowCreateDatabase() error {
checker := privilege.GetPrivilegeManager(e.ctx)
if checker != nil && e.ctx.GetSessionVars().User != nil {
if !checker.DBIsVisible(e.ctx.GetSessionVars().ActiveRoles, e.DBName.String()) {
return e.dbAccessDenied()
}
}
dbInfo, ok := e.is.SchemaByName(e.DBName)
if !ok {
return infoschema.ErrDatabaseNotExists.GenWithStackByArgs(e.DBName.O)
}
var buf bytes.Buffer
err := ConstructResultOfShowCreateDatabase(e.ctx, dbInfo, e.IfNotExists, &buf)
if err != nil {
return err
}
e.appendRow([]interface{}{dbInfo.Name.O, buf.String()})
return nil
}
// fetchShowCreatePlacementPolicy composes show create policy result.
func (e *ShowExec) fetchShowCreatePlacementPolicy() error {
policy, found := e.is.PolicyByName(e.DBName)
if !found {
return infoschema.ErrPlacementPolicyNotExists.GenWithStackByArgs(e.DBName.O)
}
showCreate := ConstructResultOfShowCreatePlacementPolicy(policy)
e.appendRow([]interface{}{e.DBName.O, showCreate})
return nil
}
func (e *ShowExec) fetchShowCollation() error {
var (
fieldPatternsLike collate.WildcardPattern
fieldFilter string
)
if e.Extractor != nil {
fieldPatternsLike = e.Extractor.FieldPatternLike()
fieldFilter = e.Extractor.Field()
}
collations := collate.GetSupportedCollations()
for _, v := range collations {
isDefault := ""
if v.IsDefault {
isDefault = "Yes"
}
if fieldFilter != "" && strings.ToLower(v.Name) != fieldFilter {
continue
} else if fieldPatternsLike != nil && !fieldPatternsLike.DoMatch(v.Name) {
continue
}
e.appendRow([]interface{}{
v.Name,
v.CharsetName,
v.ID,
isDefault,
"Yes",
1,
})
}
return nil
}
// fetchShowCreateUser composes show create create user result.
func (e *ShowExec) fetchShowCreateUser(ctx context.Context) error {
checker := privilege.GetPrivilegeManager(e.ctx)
if checker == nil {
return errors.New("miss privilege checker")
}
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnPrivilege)
userName, hostName := e.User.Username, e.User.Hostname
sessVars := e.ctx.GetSessionVars()
if e.User.CurrentUser {
userName = sessVars.User.AuthUsername
hostName = sessVars.User.AuthHostname
} else {
// Show create user requires the SELECT privilege on mysql.user.
// Ref https://dev.mysql.com/doc/refman/5.7/en/show-create-user.html
activeRoles := sessVars.ActiveRoles
if !checker.RequestVerification(activeRoles, mysql.SystemDB, mysql.UserTable, "", mysql.SelectPriv) {
return e.tableAccessDenied("SELECT", mysql.UserTable)
}
}
exec := e.ctx.(sqlexec.RestrictedSQLExecutor)
rows, _, err := exec.ExecRestrictedSQL(ctx, nil, `SELECT plugin FROM %n.%n WHERE User=%? AND Host=%?`, mysql.SystemDB, mysql.UserTable, userName, strings.ToLower(hostName))
if err != nil {
return errors.Trace(err)
}
if len(rows) == 0 {
// FIXME: the error returned is not escaped safely
return ErrCannotUser.GenWithStackByArgs("SHOW CREATE USER",
fmt.Sprintf("'%s'@'%s'", e.User.Username, e.User.Hostname))
}
authplugin := mysql.AuthNativePassword
if len(rows) == 1 && rows[0].GetString(0) != "" {
authplugin = rows[0].GetString(0)
}
rows, _, err = exec.ExecRestrictedSQL(ctx, nil, `SELECT Priv FROM %n.%n WHERE User=%? AND Host=%?`, mysql.SystemDB, mysql.GlobalPrivTable, userName, hostName)
if err != nil {
return errors.Trace(err)
}
require := "NONE"
if len(rows) == 1 {
privData := rows[0].GetString(0)
var privValue privileges.GlobalPrivValue
err = gjson.Unmarshal(hack.Slice(privData), &privValue)
if err != nil {
return errors.Trace(err)
}
require = privValue.RequireStr()
}
authData := checker.GetEncodedPassword(e.User.Username, e.User.Hostname)
authStr := ""
if !(authplugin == mysql.AuthSocket && authData == "") {
authStr = fmt.Sprintf(" AS '%s'", authData)
}
// FIXME: the returned string is not escaped safely
showStr := fmt.Sprintf("CREATE USER '%s'@'%s' IDENTIFIED WITH '%s'%s REQUIRE %s PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK",
e.User.Username, e.User.Hostname, authplugin, authStr, require)
e.appendRow([]interface{}{showStr})
return nil
}
func (e *ShowExec) fetchShowGrants() error {
vars := e.ctx.GetSessionVars()
checker := privilege.GetPrivilegeManager(e.ctx)
if checker == nil {
return errors.New("miss privilege checker")
}
if e.User == nil || e.User.CurrentUser {
// The input is a "SHOW GRANTS" statement with no users *or* SHOW GRANTS FOR CURRENT_USER()
// In these cases we include the active roles for showing privileges.
e.User = &auth.UserIdentity{Username: vars.User.AuthUsername, Hostname: vars.User.AuthHostname}
if len(e.Roles) == 0 {
e.Roles = vars.ActiveRoles
}
} else {
userName := vars.User.AuthUsername
hostName := vars.User.AuthHostname
// Show grant user requires the SELECT privilege on mysql schema.
// Ref https://dev.mysql.com/doc/refman/8.0/en/show-grants.html
if userName != e.User.Username || hostName != e.User.Hostname {
if !checker.RequestVerification(vars.ActiveRoles, mysql.SystemDB, "", "", mysql.SelectPriv) {
return ErrDBaccessDenied.GenWithStackByArgs(userName, hostName, mysql.SystemDB)
}
}
}
// This is for the syntax SHOW GRANTS FOR x USING role
for _, r := range e.Roles {
if r.Hostname == "" {
r.Hostname = "%"
}
if !checker.FindEdge(e.ctx, r, e.User) {
return ErrRoleNotGranted.GenWithStackByArgs(r.String(), e.User.String())
}
}
gs, err := checker.ShowGrants(e.ctx, e.User, e.Roles)
if err != nil {
return errors.Trace(err)
}
for _, g := range gs {
e.appendRow([]interface{}{g})
}
return nil
}
func (e *ShowExec) fetchShowPrivileges() error {
e.appendRow([]interface{}{"Alter", "Tables", "To alter the table"})
e.appendRow([]interface{}{"Alter routine", "Functions,Procedures", "To alter or drop stored functions/procedures"})
e.appendRow([]interface{}{"Create", "Databases,Tables,Indexes", "To create new databases and tables"})
e.appendRow([]interface{}{"Create routine", "Databases", "To use CREATE FUNCTION/PROCEDURE"})
e.appendRow([]interface{}{"Create temporary tables", "Databases", "To use CREATE TEMPORARY TABLE"})
e.appendRow([]interface{}{"Create view", "Tables", "To create new views"})
e.appendRow([]interface{}{"Create user", "Server Admin", "To create new users"})
e.appendRow([]interface{}{"Delete", "Tables", "To delete existing rows"})
e.appendRow([]interface{}{"Drop", "Databases,Tables", "To drop databases, tables, and views"})
e.appendRow([]interface{}{"Event", "Server Admin", "To create, alter, drop and execute events"})
e.appendRow([]interface{}{"Execute", "Functions,Procedures", "To execute stored routines"})
e.appendRow([]interface{}{"File", "File access on server", "To read and write files on the server"})
e.appendRow([]interface{}{"Grant option", "Databases,Tables,Functions,Procedures", "To give to other users those privileges you possess"})
e.appendRow([]interface{}{"Index", "Tables", "To create or drop indexes"})
e.appendRow([]interface{}{"Insert", "Tables", "To insert data into tables"})
e.appendRow([]interface{}{"Lock tables", "Databases", "To use LOCK TABLES (together with SELECT privilege)"})
e.appendRow([]interface{}{"Process", "Server Admin", "To view the plain text of currently executing queries"})
e.appendRow([]interface{}{"Proxy", "Server Admin", "To make proxy user possible"})
e.appendRow([]interface{}{"References", "Databases,Tables", "To have references on tables"})
e.appendRow([]interface{}{"Reload", "Server Admin", "To reload or refresh tables, logs and privileges"})
e.appendRow([]interface{}{"Replication client", "Server Admin", "To ask where the slave or master servers are"})
e.appendRow([]interface{}{"Replication slave", "Server Admin", "To read binary log events from the master"})
e.appendRow([]interface{}{"Select", "Tables", "To retrieve rows from table"})
e.appendRow([]interface{}{"Show databases", "Server Admin", "To see all databases with SHOW DATABASES"})
e.appendRow([]interface{}{"Show view", "Tables", "To see views with SHOW CREATE VIEW"})
e.appendRow([]interface{}{"Shutdown", "Server Admin", "To shut down the server"})
e.appendRow([]interface{}{"Super", "Server Admin", "To use KILL thread, SET GLOBAL, CHANGE MASTER, etc."})
e.appendRow([]interface{}{"Trigger", "Tables", "To use triggers"})
e.appendRow([]interface{}{"Create tablespace", "Server Admin", "To create/alter/drop tablespaces"})
e.appendRow([]interface{}{"Update", "Tables", "To update existing rows"})
e.appendRow([]interface{}{"Usage", "Server Admin", "No privileges - allow connect only"})
for _, priv := range privileges.GetDynamicPrivileges() {
e.appendRow([]interface{}{priv, "Server Admin", ""})
}
return nil
}
func (e *ShowExec) fetchShowTriggers() error {
return nil
}
func (e *ShowExec) fetchShowProcedureStatus() error {
return nil
}
func (e *ShowExec) fetchShowPlugins() error {
tiPlugins := plugin.GetAll()
for _, ps := range tiPlugins {
for _, p := range ps {
e.appendRow([]interface{}{p.Name, p.StateValue(), p.Kind.String(), p.Path, p.License, strconv.Itoa(int(p.Version))})
}
}
return nil
}
func (e *ShowExec) fetchShowWarnings(errOnly bool) error {
stmtCtx := e.ctx.GetSessionVars().StmtCtx
if e.CountWarningsOrErrors {
errCount, warnCount := stmtCtx.NumErrorWarnings()
if errOnly {
e.appendRow([]interface{}{int64(errCount)})
} else {
e.appendRow([]interface{}{int64(warnCount)})
}
return nil
}
for _, w := range stmtCtx.GetWarnings() {
if errOnly && w.Level != stmtctx.WarnLevelError {
continue
}
warn := errors.Cause(w.Err)
switch x := warn.(type) {
case *terror.Error:
sqlErr := terror.ToSQLError(x)
e.appendRow([]interface{}{w.Level, int64(sqlErr.Code), sqlErr.Message})
default:
e.appendRow([]interface{}{w.Level, int64(mysql.ErrUnknown), warn.Error()})
}
}
return nil
}
// fetchShowPumpOrDrainerStatus gets status of all pumps or drainers and fill them into e.rows.
func (e *ShowExec) fetchShowPumpOrDrainerStatus(kind string) error {
registry, err := createRegistry(config.GetGlobalConfig().Path)
if err != nil {
return errors.Trace(err)
}
nodes, _, err := registry.Nodes(context.Background(), node.NodePrefix[kind])
if err != nil {
return errors.Trace(err)
}
err = registry.Close()
if err != nil {
return errors.Trace(err)
}
for _, n := range nodes {
if n.State == node.Offline {
continue
}
e.appendRow([]interface{}{n.NodeID, n.Addr, n.State, n.MaxCommitTS, util.TSOToRoughTime(n.UpdateTS).Format(types.TimeFormat)})
}
return nil
}
// createRegistry returns an ectd registry
func createRegistry(urls string) (*node.EtcdRegistry, error) {
ectdEndpoints, err := util.ParseHostPortAddr(urls)
if err != nil {
return nil, errors.Trace(err)
}
cli, err := etcd.NewClientFromCfg(ectdEndpoints, etcdDialTimeout, node.DefaultRootPath, nil)
if err != nil {
return nil, errors.Trace(err)
}
return node.NewEtcdRegistry(cli, etcdDialTimeout), nil
}
func (e *ShowExec) getTable() (table.Table, error) {
if e.Table == nil {
return nil, errors.New("table not found")
}
tb, ok := e.is.TableByID(e.Table.TableInfo.ID)
if !ok {
return nil, errors.Errorf("table %s not found", e.Table.Name)
}
return tb, nil
}
func (e *ShowExec) dbAccessDenied() error {
user := e.ctx.GetSessionVars().User
u := user.Username
h := user.Hostname
if len(user.AuthUsername) > 0 && len(user.AuthHostname) > 0 {
u = user.AuthUsername
h = user.AuthHostname
}
return ErrDBaccessDenied.GenWithStackByArgs(u, h, e.DBName)
}
func (e *ShowExec) tableAccessDenied(access string, table string) error {
user := e.ctx.GetSessionVars().User
u := user.Username
h := user.Hostname
if len(user.AuthUsername) > 0 && len(user.AuthHostname) > 0 {
u = user.AuthUsername
h = user.AuthHostname
}
return ErrTableaccessDenied.GenWithStackByArgs(access, u, h, table)
}
func (e *ShowExec) appendRow(row []interface{}) {
for i, col := range row {
switch x := col.(type) {
case nil:
e.result.AppendNull(i)
case int:
e.result.AppendInt64(i, int64(x))
case int64:
e.result.AppendInt64(i, x)
case uint64:
e.result.AppendUint64(i, x)
case float64:
e.result.AppendFloat64(i, x)
case float32:
e.result.AppendFloat32(i, x)
case string:
e.result.AppendString(i, x)
case []byte:
e.result.AppendBytes(i, x)
case types.BinaryLiteral:
e.result.AppendBytes(i, x)
case *types.MyDecimal:
e.result.AppendMyDecimal(i, x)
case types.Time:
e.result.AppendTime(i, x)
case types.BinaryJSON:
e.result.AppendJSON(i, x)
case types.Duration:
e.result.AppendDuration(i, x)
case types.Enum:
e.result.AppendEnum(i, x)
case types.Set:
e.result.AppendSet(i, x)
default:
e.result.AppendNull(i)
}
}
}
func (e *ShowExec) fetchShowTableRegions(ctx context.Context) error {
store := e.ctx.GetStore()
tikvStore, ok := store.(helper.Storage)
if !ok {
return nil
}
splitStore, ok := store.(kv.SplittableStore)
if !ok {
return nil
}
tb, err := e.getTable()
if err != nil {
return errors.Trace(err)
}
physicalIDs := []int64{}
if pi := tb.Meta().GetPartitionInfo(); pi != nil {
for _, name := range e.Table.PartitionNames {
pid, err := tables.FindPartitionByName(tb.Meta(), name.L)
if err != nil {
return err
}
physicalIDs = append(physicalIDs, pid)
}
if len(physicalIDs) == 0 {
for _, p := range pi.Definitions {
physicalIDs = append(physicalIDs, p.ID)
}
}
} else {
if len(e.Table.PartitionNames) != 0 {
return plannercore.ErrPartitionClauseOnNonpartitioned
}
physicalIDs = append(physicalIDs, tb.Meta().ID)
}
// Get table regions from from pd, not from regionCache, because the region cache maybe outdated.
var regions []regionMeta
if len(e.IndexName.L) != 0 {
// show table * index * region
indexInfo := tb.Meta().FindIndexByName(e.IndexName.L)
if indexInfo == nil {
return plannercore.ErrKeyDoesNotExist.GenWithStackByArgs(e.IndexName, tb.Meta().Name)
}
regions, err = getTableIndexRegions(indexInfo, physicalIDs, tikvStore, splitStore)
} else {
// show table * region
regions, err = getTableRegions(tb, physicalIDs, tikvStore, splitStore)
}
if err != nil {
return err
}
regionRowItem, err := e.fetchSchedulingInfo(ctx, regions, tb.Meta())
if err != nil {
return err
}
e.fillRegionsToChunk(regionRowItem)
return nil
}
func (e *ShowExec) fetchSchedulingInfo(ctx context.Context, regions []regionMeta, tbInfo *model.TableInfo) ([]showTableRegionRowItem, error) {
scheduleState := make(map[int64]infosync.PlacementScheduleState)
schedulingConstraints := make(map[int64]*model.PlacementSettings)
regionRowItem := make([]showTableRegionRowItem, 0)
tblPlacement, err := e.getTablePlacement(tbInfo)
if err != nil {
return nil, err
}
if tbInfo.GetPartitionInfo() != nil {
// partitioned table
for _, part := range tbInfo.GetPartitionInfo().Definitions {
_, err = fetchScheduleState(ctx, scheduleState, part.ID)
if err != nil {
return nil, err
}
placement, err := e.getPolicyPlacement(part.PlacementPolicyRef)
if err != nil {
return nil, err
}
if placement == nil {
schedulingConstraints[part.ID] = tblPlacement
} else {
schedulingConstraints[part.ID] = placement
}
}
} else {
// un-partitioned table or index
schedulingConstraints[tbInfo.ID] = tblPlacement
_, err = fetchScheduleState(ctx, scheduleState, tbInfo.ID)
if err != nil {
return nil, err
}
}
var constraintStr string
var scheduleStateStr string
for i := range regions {
if constraint, ok := schedulingConstraints[regions[i].physicalID]; ok && constraint != nil {
constraintStr = constraint.String()
scheduleStateStr = scheduleState[regions[i].physicalID].String()
} else {
constraintStr = ""
scheduleStateStr = ""
}
regionRowItem = append(regionRowItem, showTableRegionRowItem{
regionMeta: regions[i],
schedulingConstraints: constraintStr,
schedulingState: scheduleStateStr,
})
}
return regionRowItem, nil
}
func getTableRegions(tb table.Table, physicalIDs []int64, tikvStore helper.Storage, splitStore kv.SplittableStore) ([]regionMeta, error) {
regions := make([]regionMeta, 0, len(physicalIDs))
uniqueRegionMap := make(map[uint64]struct{})
for _, id := range physicalIDs {
rs, err := getPhysicalTableRegions(id, tb.Meta(), tikvStore, splitStore, uniqueRegionMap)
if err != nil {
return nil, err
}
regions = append(regions, rs...)
}
return regions, nil
}
func getTableIndexRegions(indexInfo *model.IndexInfo, physicalIDs []int64, tikvStore helper.Storage, splitStore kv.SplittableStore) ([]regionMeta, error) {
regions := make([]regionMeta, 0, len(physicalIDs))
uniqueRegionMap := make(map[uint64]struct{})
for _, id := range physicalIDs {
rs, err := getPhysicalIndexRegions(id, indexInfo, tikvStore, splitStore, uniqueRegionMap)
if err != nil {
return nil, err
}
regions = append(regions, rs...)
}
return regions, nil
}
func (e *ShowExec) fillRegionsToChunk(regions []showTableRegionRowItem) {
for i := range regions {
e.result.AppendUint64(0, regions[i].region.Id)
e.result.AppendString(1, regions[i].start)
e.result.AppendString(2, regions[i].end)
e.result.AppendUint64(3, regions[i].leaderID)
e.result.AppendUint64(4, regions[i].storeID)
peers := ""
for i, peer := range regions[i].region.Peers {
if i > 0 {
peers += ", "
}
peers += strconv.FormatUint(peer.Id, 10)
}
e.result.AppendString(5, peers)
if regions[i].scattering {
e.result.AppendInt64(6, 1)
} else {
e.result.AppendInt64(6, 0)
}
e.result.AppendUint64(7, regions[i].writtenBytes)
e.result.AppendUint64(8, regions[i].readBytes)
e.result.AppendInt64(9, regions[i].approximateSize)
e.result.AppendInt64(10, regions[i].approximateKeys)
e.result.AppendString(11, regions[i].schedulingConstraints)
e.result.AppendString(12, regions[i].schedulingState)
}
}
func (e *ShowExec) fetchShowBuiltins() error {
for _, f := range expression.GetBuiltinList() {
e.appendRow([]interface{}{f})
}
return nil
}
func (e *ShowExec) fetchShowSessionStates(ctx context.Context) error {
sessionStates := &sessionstates.SessionStates{}
err := e.ctx.EncodeSessionStates(ctx, e.ctx, sessionStates)
if err != nil {
return err
}
stateBytes, err := gjson.Marshal(sessionStates)
if err != nil {
return errors.Trace(err)
}
stateJSON := types.BinaryJSON{}
if err = stateJSON.UnmarshalJSON(stateBytes); err != nil {
return err
}
// session token
var token *sessionstates.SessionToken
// In testing, user may be nil.
if user := e.ctx.GetSessionVars().User; user != nil {
// The token may be leaked without secure transport, so we enforce secure transport (TLS or Unix Socket).
if !e.ctx.GetSessionVars().ConnectionInfo.IsSecureTransport() {
return sessionstates.ErrCannotMigrateSession.GenWithStackByArgs("the token must be queried with secure transport")
}
if token, err = sessionstates.CreateSessionToken(user.Username); err != nil {
return err
}
}
tokenBytes, err := gjson.Marshal(token)
if err != nil {
return errors.Trace(err)
}
tokenJSON := types.BinaryJSON{}
if err = tokenJSON.UnmarshalJSON(tokenBytes); err != nil {
return err
}
e.appendRow([]interface{}{stateJSON, tokenJSON})
return nil
}
// tryFillViewColumnType fill the columns type info of a view.
// Because view's underlying table's column could change or recreate, so view's column type may change over time.
// To avoid this situation we need to generate a logical plan and extract current column types from Schema.
func tryFillViewColumnType(ctx context.Context, sctx sessionctx.Context, is infoschema.InfoSchema, dbName model.CIStr, tbl *model.TableInfo) error {
if !tbl.IsView() {
return nil
}
ctx = kv.WithInternalSourceType(context.Background(), kv.InternalTxnOthers)
// We need to run the build plan process in another session because there may be
// multiple goroutines running at the same time while session is not goroutine-safe.
// Take joining system table as an example, `fetchBuildSideRows` and `fetchProbeSideChunks` can be run concurrently.
return runWithSystemSession(ctx, sctx, func(s sessionctx.Context) error {
// Retrieve view columns info.
planBuilder, _ := plannercore.NewPlanBuilder(
plannercore.PlanBuilderOptNoExecution{}).Init(s, is, &hint.BlockHintProcessor{})
if viewLogicalPlan, err := planBuilder.BuildDataSourceFromView(ctx, dbName, tbl); err == nil {
viewSchema := viewLogicalPlan.Schema()
viewOutputNames := viewLogicalPlan.OutputNames()
for _, col := range tbl.Columns {
idx := expression.FindFieldNameIdxByColName(viewOutputNames, col.Name.L)
if idx >= 0 {
col.FieldType = *viewSchema.Columns[idx].GetType()
}
if col.GetType() == mysql.TypeVarString {
col.SetType(mysql.TypeVarchar)
}
}
} else {
return err
}
return nil
})
}
func runWithSystemSession(ctx context.Context, sctx sessionctx.Context, fn func(sessionctx.Context) error) error {
b := &baseExecutor{ctx: sctx}
sysCtx, err := b.getSysSession()
if err != nil {
return err
}
defer b.releaseSysSession(ctx, sysCtx)
return fn(sysCtx)
}
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