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planbuilder.go
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planbuilder.go
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// Copyright 2015 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package plan
import (
"fmt"
"strings"
"github.com/juju/errors"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/parser/opcode"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/ranger"
)
type visitInfo struct {
privilege mysql.PrivilegeType
db string
table string
column string
}
type tableHintInfo struct {
indexNestedLoopJoinTables []model.CIStr
sortMergeJoinTables []model.CIStr
hashJoinTables []model.CIStr
}
func (info *tableHintInfo) ifPreferMergeJoin(tableNames ...*model.CIStr) bool {
return info.matchTableName(tableNames, info.sortMergeJoinTables)
}
func (info *tableHintInfo) ifPreferHashJoin(tableNames ...*model.CIStr) bool {
return info.matchTableName(tableNames, info.hashJoinTables)
}
func (info *tableHintInfo) ifPreferINLJ(tableNames ...*model.CIStr) bool {
return info.matchTableName(tableNames, info.indexNestedLoopJoinTables)
}
// matchTableName checks whether the hint hit the need.
// Only need either side matches one on the list.
// Even though you can put 2 tables on the list,
// it doesn't mean optimizer will reorder to make them
// join directly.
// Which it joins on with depend on sequence of traverse
// and without reorder, user might adjust themselves.
// This is similar to MySQL hints.
func (info *tableHintInfo) matchTableName(tables []*model.CIStr, tablesInHints []model.CIStr) bool {
for _, tableName := range tables {
if tableName == nil {
continue
}
for _, curEntry := range tablesInHints {
if curEntry.L == tableName.L {
return true
}
}
}
return false
}
// clauseCode indicates in which clause the column is currently.
type clauseCode int
const (
unknowClause clauseCode = iota
fieldList
havingClause
onClause
orderByClause
whereClause
groupByClause
showStatement
)
var clauseMsg = map[clauseCode]string{
unknowClause: "",
fieldList: "field list",
havingClause: "having clause",
onClause: "on clause",
orderByClause: "order clause",
whereClause: "where clause",
groupByClause: "group statement",
showStatement: "show statement",
}
// planBuilder builds Plan from an ast.Node.
// It just builds the ast node straightforwardly.
type planBuilder struct {
ctx sessionctx.Context
is infoschema.InfoSchema
outerSchemas []*expression.Schema
inUpdateStmt bool
// colMapper stores the column that must be pre-resolved.
colMapper map[*ast.ColumnNameExpr]int
// Collect the visit information for privilege check.
visitInfo []visitInfo
tableHintInfo []tableHintInfo
optFlag uint64
curClause clauseCode
// rewriterPool stores the expressionRewriter we have created to reuse it if it has been released.
// rewriterCounter counts how many rewriter is being used.
rewriterPool []*expressionRewriter
rewriterCounter int
// inStraightJoin represents whether the current "SELECT" statement has
// "STRAIGHT_JOIN" option.
inStraightJoin bool
}
func (b *planBuilder) build(node ast.Node) (Plan, error) {
b.optFlag = flagPrunColumns
switch x := node.(type) {
case *ast.AdminStmt:
return b.buildAdmin(x)
case *ast.DeallocateStmt:
return &Deallocate{Name: x.Name}, nil
case *ast.DeleteStmt:
return b.buildDelete(x)
case *ast.ExecuteStmt:
return b.buildExecute(x)
case *ast.ExplainStmt:
return b.buildExplain(x)
case *ast.InsertStmt:
return b.buildInsert(x)
case *ast.LoadDataStmt:
return b.buildLoadData(x)
case *ast.LoadStatsStmt:
return b.buildLoadStats(x), nil
case *ast.PrepareStmt:
return b.buildPrepare(x), nil
case *ast.SelectStmt:
return b.buildSelect(x)
case *ast.UnionStmt:
return b.buildUnion(x)
case *ast.UpdateStmt:
return b.buildUpdate(x)
case *ast.ShowStmt:
return b.buildShow(x)
case *ast.DoStmt:
return b.buildDo(x)
case *ast.SetStmt:
return b.buildSet(x)
case *ast.AnalyzeTableStmt:
return b.buildAnalyze(x)
case *ast.BinlogStmt, *ast.FlushStmt, *ast.UseStmt,
*ast.BeginStmt, *ast.CommitStmt, *ast.RollbackStmt, *ast.CreateUserStmt, *ast.SetPwdStmt,
*ast.GrantStmt, *ast.DropUserStmt, *ast.AlterUserStmt, *ast.RevokeStmt, *ast.KillStmt, *ast.DropStatsStmt:
return b.buildSimple(node.(ast.StmtNode)), nil
case ast.DDLNode:
return b.buildDDL(x), nil
}
return nil, ErrUnsupportedType.Gen("Unsupported type %T", node)
}
func (b *planBuilder) buildExecute(v *ast.ExecuteStmt) (Plan, error) {
vars := make([]expression.Expression, 0, len(v.UsingVars))
for _, expr := range v.UsingVars {
newExpr, _, err := b.rewrite(expr, nil, nil, true)
if err != nil {
return nil, errors.Trace(err)
}
vars = append(vars, newExpr)
}
exe := &Execute{Name: v.Name, UsingVars: vars, ExecID: v.ExecID}
return exe, nil
}
func (b *planBuilder) buildDo(v *ast.DoStmt) (Plan, error) {
dual := LogicalTableDual{RowCount: 1}.init(b.ctx)
p := LogicalProjection{Exprs: make([]expression.Expression, 0, len(v.Exprs))}.init(b.ctx)
schema := expression.NewSchema(make([]*expression.Column, 0, len(v.Exprs))...)
for _, astExpr := range v.Exprs {
expr, _, err := b.rewrite(astExpr, dual, nil, true)
if err != nil {
return nil, errors.Trace(err)
}
p.Exprs = append(p.Exprs, expr)
schema.Append(&expression.Column{
UniqueID: b.ctx.GetSessionVars().AllocPlanColumnID(),
RetType: expr.GetType(),
})
}
p.SetChildren(dual)
p.self = p
p.SetSchema(schema)
p.calculateNoDelay = true
return p, nil
}
func (b *planBuilder) buildSet(v *ast.SetStmt) (Plan, error) {
p := &Set{}
for _, vars := range v.Variables {
assign := &expression.VarAssignment{
Name: vars.Name,
IsGlobal: vars.IsGlobal,
IsSystem: vars.IsSystem,
}
if _, ok := vars.Value.(*ast.DefaultExpr); !ok {
if cn, ok2 := vars.Value.(*ast.ColumnNameExpr); ok2 && cn.Name.Table.L == "" {
// Convert column name expression to string value expression.
vars.Value = ast.NewValueExpr(cn.Name.Name.O)
}
mockTablePlan := LogicalTableDual{}.init(b.ctx)
var err error
assign.Expr, _, err = b.rewrite(vars.Value, mockTablePlan, nil, true)
if err != nil {
return nil, errors.Trace(err)
}
} else {
assign.IsDefault = true
}
if vars.ExtendValue != nil {
assign.ExtendValue = &expression.Constant{
Value: vars.ExtendValue.Datum,
RetType: &vars.ExtendValue.Type,
}
}
p.VarAssigns = append(p.VarAssigns, assign)
}
return p, nil
}
// Detect aggregate function or groupby clause.
func (b *planBuilder) detectSelectAgg(sel *ast.SelectStmt) bool {
if sel.GroupBy != nil {
return true
}
for _, f := range sel.Fields.Fields {
if ast.HasAggFlag(f.Expr) {
return true
}
}
if sel.Having != nil {
if ast.HasAggFlag(sel.Having.Expr) {
return true
}
}
if sel.OrderBy != nil {
for _, item := range sel.OrderBy.Items {
if ast.HasAggFlag(item.Expr) {
return true
}
}
}
return false
}
func getPathByIndexName(paths []*accessPath, idxName model.CIStr, tblInfo *model.TableInfo) *accessPath {
var tablePath *accessPath
for _, path := range paths {
if path.isTablePath {
tablePath = path
continue
}
if path.index.Name.L == idxName.L {
return path
}
}
if isPrimaryIndexHint(idxName) && tblInfo.PKIsHandle {
return tablePath
}
return nil
}
func isPrimaryIndexHint(indexName model.CIStr) bool {
return indexName.L == "primary"
}
func getPossibleAccessPaths(indexHints []*ast.IndexHint, tblInfo *model.TableInfo) ([]*accessPath, error) {
publicPaths := make([]*accessPath, 0, len(tblInfo.Indices)+1)
publicPaths = append(publicPaths, &accessPath{isTablePath: true})
for _, index := range tblInfo.Indices {
if index.State == model.StatePublic {
publicPaths = append(publicPaths, &accessPath{index: index})
}
}
hasScanHint, hasUseOrForce := false, false
available := make([]*accessPath, 0, len(publicPaths))
ignored := make([]*accessPath, 0, len(publicPaths))
for _, hint := range indexHints {
if hint.HintScope != ast.HintForScan {
continue
}
hasScanHint = true
for _, idxName := range hint.IndexNames {
path := getPathByIndexName(publicPaths, idxName, tblInfo)
if path == nil {
return nil, ErrKeyDoesNotExist.GenByArgs(idxName, tblInfo.Name)
}
if hint.HintType == ast.HintIgnore {
// Collect all the ignored index hints.
ignored = append(ignored, path)
continue
}
// Currently we don't distinguish between "FORCE" and "USE" because
// our cost estimation is not reliable.
hasUseOrForce = true
path.forced = true
available = append(available, path)
}
}
if !hasScanHint || !hasUseOrForce {
available = publicPaths
}
available = removeIgnoredPaths(available, ignored, tblInfo)
// If we have got "FORCE" or "USE" index hint but got no available index,
// we have to use table scan.
if len(available) == 0 {
available = append(available, &accessPath{isTablePath: true})
}
return available, nil
}
func removeIgnoredPaths(paths, ignoredPaths []*accessPath, tblInfo *model.TableInfo) []*accessPath {
if len(ignoredPaths) == 0 {
return paths
}
remainedPaths := make([]*accessPath, 0, len(paths))
for _, path := range paths {
if path.isTablePath || getPathByIndexName(ignoredPaths, path.index.Name, tblInfo) == nil {
remainedPaths = append(remainedPaths, path)
}
}
return remainedPaths
}
func findIndexByName(indices []*model.IndexInfo, name model.CIStr) *model.IndexInfo {
for _, idx := range indices {
if idx.Name.L == name.L {
return idx
}
}
return nil
}
func (b *planBuilder) buildSelectLock(src LogicalPlan, lock ast.SelectLockType) *LogicalLock {
selectLock := LogicalLock{Lock: lock}.init(b.ctx)
selectLock.SetChildren(src)
return selectLock
}
func (b *planBuilder) buildPrepare(x *ast.PrepareStmt) Plan {
p := &Prepare{
Name: x.Name,
}
if x.SQLVar != nil {
p.SQLText, _ = x.SQLVar.GetValue().(string)
} else {
p.SQLText = x.SQLText
}
return p
}
func (b *planBuilder) buildCheckIndex(dbName model.CIStr, as *ast.AdminStmt) (Plan, error) {
tblName := as.Tables[0]
tbl, err := b.is.TableByName(dbName, tblName.Name)
if err != nil {
return nil, errors.Trace(err)
}
tblInfo := tbl.Meta()
// get index information
var idx *model.IndexInfo
for _, index := range tblInfo.Indices {
if index.Name.L == strings.ToLower(as.Index) {
idx = index
break
}
}
if idx == nil {
return nil, errors.Errorf("index %s do not exist", as.Index)
}
if idx.State != model.StatePublic {
return nil, errors.Errorf("index %s state %s isn't public", as.Index, idx.State)
}
id := 1
columns := make([]*model.ColumnInfo, 0, len(idx.Columns))
schema := expression.NewSchema(make([]*expression.Column, 0, len(idx.Columns))...)
for _, idxCol := range idx.Columns {
for _, col := range tblInfo.Columns {
if idxCol.Name.L == col.Name.L {
columns = append(columns, col)
schema.Append(&expression.Column{
ColName: col.Name,
UniqueID: b.ctx.GetSessionVars().AllocPlanColumnID(),
RetType: &col.FieldType,
})
}
}
}
is := PhysicalIndexScan{
Table: tblInfo,
TableAsName: &tblName.Name,
DBName: dbName,
Columns: columns,
Index: idx,
dataSourceSchema: schema,
Ranges: ranger.FullRange(),
KeepOrder: false,
}.init(b.ctx)
is.stats = &statsInfo{}
cop := &copTask{indexPlan: is}
// It's double read case.
ts := PhysicalTableScan{Columns: columns, Table: is.Table}.init(b.ctx)
ts.SetSchema(is.dataSourceSchema)
cop.tablePlan = ts
is.initSchema(id, idx, true)
t := finishCopTask(b.ctx, cop)
rootT := t.(*rootTask)
return rootT.p, nil
}
func (b *planBuilder) buildAdmin(as *ast.AdminStmt) (Plan, error) {
var ret Plan
switch as.Tp {
case ast.AdminCheckTable:
p := &CheckTable{Tables: as.Tables}
ret = p
case ast.AdminCheckIndex:
dbName := as.Tables[0].Schema
readerPlan, err := b.buildCheckIndex(dbName, as)
if err != nil {
return ret, errors.Trace(err)
}
ret = &CheckIndex{
DBName: dbName.L,
IdxName: as.Index,
IndexLookUpReader: readerPlan.(*PhysicalIndexLookUpReader),
}
case ast.AdminRecoverIndex:
p := &RecoverIndex{Table: as.Tables[0], IndexName: as.Index}
p.SetSchema(buildRecoverIndexFields())
ret = p
case ast.AdminCleanupIndex:
p := &CleanupIndex{Table: as.Tables[0], IndexName: as.Index}
p.SetSchema(buildCleanupIndexFields())
ret = p
case ast.AdminChecksumTable:
p := &ChecksumTable{Tables: as.Tables}
p.SetSchema(buildChecksumTableSchema())
ret = p
case ast.AdminShowDDL:
p := &ShowDDL{}
p.SetSchema(buildShowDDLFields())
ret = p
case ast.AdminShowDDLJobs:
p := &ShowDDLJobs{JobNumber: as.JobNumber}
p.SetSchema(buildShowDDLJobsFields())
ret = p
case ast.AdminCancelDDLJobs:
p := &CancelDDLJobs{JobIDs: as.JobIDs}
p.SetSchema(buildCancelDDLJobsFields())
ret = p
case ast.AdminCheckIndexRange:
schema, err := b.buildCheckIndexSchema(as.Tables[0], as.Index)
if err != nil {
return nil, errors.Trace(err)
}
p := &CheckIndexRange{Table: as.Tables[0], IndexName: as.Index, HandleRanges: as.HandleRanges}
p.SetSchema(schema)
ret = p
case ast.AdminShowDDLJobQueries:
p := &ShowDDLJobQueries{JobIDs: as.JobIDs}
p.SetSchema(buildShowDDLJobQueriesFields())
ret = p
default:
return nil, ErrUnsupportedType.Gen("Unsupported ast.AdminStmt(%T) for buildAdmin", as)
}
return ret, nil
}
func (b *planBuilder) buildCheckIndexSchema(tn *ast.TableName, indexName string) (*expression.Schema, error) {
schema := expression.NewSchema()
indexName = strings.ToLower(indexName)
indicesInfo := tn.TableInfo.Indices
cols := tn.TableInfo.Cols()
for _, idxInfo := range indicesInfo {
if idxInfo.Name.L != indexName {
continue
}
for _, idxCol := range idxInfo.Columns {
col := cols[idxCol.Offset]
schema.Append(&expression.Column{
ColName: idxCol.Name,
TblName: tn.Name,
DBName: tn.Schema,
RetType: &col.FieldType,
UniqueID: b.ctx.GetSessionVars().AllocPlanColumnID(),
ID: col.ID})
}
schema.Append(&expression.Column{
ColName: model.NewCIStr("extra_handle"),
TblName: tn.Name,
DBName: tn.Schema,
RetType: types.NewFieldType(mysql.TypeLonglong),
UniqueID: b.ctx.GetSessionVars().AllocPlanColumnID(),
ID: -1,
})
}
if schema.Len() == 0 {
return nil, errors.Errorf("index %s not found", indexName)
}
return schema, nil
}
// getColsInfo returns the info of index columns, normal columns and primary key.
func getColsInfo(tn *ast.TableName) (indicesInfo []*model.IndexInfo, colsInfo []*model.ColumnInfo, pkCol *model.ColumnInfo) {
tbl := tn.TableInfo
// idxNames contains all the normal columns that can be analyzed more effectively, because those columns occur as index
// columns or primary key columns with integer type.
var idxNames []string
if tbl.PKIsHandle {
for _, col := range tbl.Columns {
if mysql.HasPriKeyFlag(col.Flag) {
idxNames = append(idxNames, col.Name.L)
pkCol = col
}
}
}
for _, idx := range tn.TableInfo.Indices {
if idx.State == model.StatePublic {
indicesInfo = append(indicesInfo, idx)
if len(idx.Columns) == 1 {
idxNames = append(idxNames, idx.Columns[0].Name.L)
}
}
}
for _, col := range tbl.Columns {
isIndexCol := false
for _, idx := range idxNames {
if idx == col.Name.L {
isIndexCol = true
break
}
}
if !isIndexCol {
colsInfo = append(colsInfo, col)
}
}
return
}
func getPhysicalIDs(tblInfo *model.TableInfo) []int64 {
if pi := tblInfo.GetPartitionInfo(); pi != nil {
ids := make([]int64, 0, len(pi.Definitions))
for _, def := range pi.Definitions {
ids = append(ids, def.ID)
}
return ids
}
return []int64{tblInfo.ID}
}
func (b *planBuilder) buildAnalyzeTable(as *ast.AnalyzeTableStmt) Plan {
p := &Analyze{}
for _, tbl := range as.TableNames {
idxInfo, colInfo, pkInfo := getColsInfo(tbl)
physicalIDs := getPhysicalIDs(tbl.TableInfo)
for _, idx := range idxInfo {
for _, id := range physicalIDs {
p.IdxTasks = append(p.IdxTasks, AnalyzeIndexTask{PhysicalTableID: id, IndexInfo: idx})
}
}
if len(colInfo) > 0 || pkInfo != nil {
for _, id := range physicalIDs {
p.ColTasks = append(p.ColTasks, AnalyzeColumnsTask{PhysicalTableID: id, PKInfo: pkInfo, ColsInfo: colInfo})
}
}
}
return p
}
func (b *planBuilder) buildAnalyzeIndex(as *ast.AnalyzeTableStmt) (Plan, error) {
p := &Analyze{}
tblInfo := as.TableNames[0].TableInfo
physicalIDs := getPhysicalIDs(tblInfo)
for _, idxName := range as.IndexNames {
idx := findIndexByName(tblInfo.Indices, idxName)
if idx == nil || idx.State != model.StatePublic {
return nil, ErrAnalyzeMissIndex.GenByArgs(idxName.O, tblInfo.Name.O)
}
for _, id := range physicalIDs {
p.IdxTasks = append(p.IdxTasks, AnalyzeIndexTask{PhysicalTableID: id, IndexInfo: idx})
}
}
return p, nil
}
func (b *planBuilder) buildAnalyzeAllIndex(as *ast.AnalyzeTableStmt) Plan {
p := &Analyze{}
tblInfo := as.TableNames[0].TableInfo
physicalIDs := getPhysicalIDs(tblInfo)
for _, idx := range tblInfo.Indices {
if idx.State == model.StatePublic {
for _, id := range physicalIDs {
p.IdxTasks = append(p.IdxTasks, AnalyzeIndexTask{PhysicalTableID: id, IndexInfo: idx})
}
}
}
return p
}
func (b *planBuilder) buildAnalyze(as *ast.AnalyzeTableStmt) (Plan, error) {
if as.IndexFlag {
if len(as.IndexNames) == 0 {
return b.buildAnalyzeAllIndex(as), nil
}
return b.buildAnalyzeIndex(as)
}
return b.buildAnalyzeTable(as), nil
}
func buildShowDDLFields() *expression.Schema {
schema := expression.NewSchema(make([]*expression.Column, 0, 4)...)
schema.Append(buildColumn("", "SCHEMA_VER", mysql.TypeLonglong, 4))
schema.Append(buildColumn("", "OWNER", mysql.TypeVarchar, 64))
schema.Append(buildColumn("", "RUNNING_JOBS", mysql.TypeVarchar, 256))
schema.Append(buildColumn("", "SELF_ID", mysql.TypeVarchar, 64))
return schema
}
func buildRecoverIndexFields() *expression.Schema {
schema := expression.NewSchema(make([]*expression.Column, 0, 2)...)
schema.Append(buildColumn("", "ADDED_COUNT", mysql.TypeLonglong, 4))
schema.Append(buildColumn("", "SCAN_COUNT", mysql.TypeLonglong, 4))
return schema
}
func buildCleanupIndexFields() *expression.Schema {
schema := expression.NewSchema(make([]*expression.Column, 0, 1)...)
schema.Append(buildColumn("", "REMOVED_COUNT", mysql.TypeLonglong, 4))
return schema
}
func buildShowDDLJobsFields() *expression.Schema {
schema := expression.NewSchema(make([]*expression.Column, 0, 10)...)
schema.Append(buildColumn("", "JOB_ID", mysql.TypeLonglong, 4))
schema.Append(buildColumn("", "DB_NAME", mysql.TypeVarchar, 64))
schema.Append(buildColumn("", "TABLE_NAME", mysql.TypeVarchar, 64))
schema.Append(buildColumn("", "JOB_TYPE", mysql.TypeVarchar, 64))
schema.Append(buildColumn("", "SCHEMA_STATE", mysql.TypeVarchar, 64))
schema.Append(buildColumn("", "SCHEMA_ID", mysql.TypeLonglong, 4))
schema.Append(buildColumn("", "TABLE_ID", mysql.TypeLonglong, 4))
schema.Append(buildColumn("", "ROW_COUNT", mysql.TypeLonglong, 4))
schema.Append(buildColumn("", "START_TIME", mysql.TypeVarchar, 64))
schema.Append(buildColumn("", "STATE", mysql.TypeVarchar, 64))
return schema
}
func buildShowDDLJobQueriesFields() *expression.Schema {
schema := expression.NewSchema(make([]*expression.Column, 0, 1)...)
schema.Append(buildColumn("", "QUERY", mysql.TypeVarchar, 256))
return schema
}
func buildCancelDDLJobsFields() *expression.Schema {
schema := expression.NewSchema(make([]*expression.Column, 0, 2)...)
schema.Append(buildColumn("", "JOB_ID", mysql.TypeVarchar, 64))
schema.Append(buildColumn("", "RESULT", mysql.TypeVarchar, 128))
return schema
}
func buildColumn(tableName, name string, tp byte, size int) *expression.Column {
cs, cl := types.DefaultCharsetForType(tp)
flag := mysql.UnsignedFlag
if tp == mysql.TypeVarchar || tp == mysql.TypeBlob {
cs = mysql.DefaultCharset
cl = mysql.DefaultCollationName
flag = 0
}
fieldType := &types.FieldType{
Charset: cs,
Collate: cl,
Tp: tp,
Flen: size,
Flag: flag,
}
return &expression.Column{
ColName: model.NewCIStr(name),
TblName: model.NewCIStr(tableName),
DBName: model.NewCIStr(infoschema.Name),
RetType: fieldType,
}
}
// splitWhere split a where expression to a list of AND conditions.
func splitWhere(where ast.ExprNode) []ast.ExprNode {
var conditions []ast.ExprNode
switch x := where.(type) {
case nil:
case *ast.BinaryOperationExpr:
if x.Op == opcode.LogicAnd {
conditions = append(conditions, splitWhere(x.L)...)
conditions = append(conditions, splitWhere(x.R)...)
} else {
conditions = append(conditions, x)
}
case *ast.ParenthesesExpr:
conditions = append(conditions, splitWhere(x.Expr)...)
default:
conditions = append(conditions, where)
}
return conditions
}
func (b *planBuilder) buildShow(show *ast.ShowStmt) (Plan, error) {
p := Show{
Tp: show.Tp,
DBName: show.DBName,
Table: show.Table,
Column: show.Column,
Flag: show.Flag,
Full: show.Full,
User: show.User,
GlobalScope: show.GlobalScope,
}.init(b.ctx)
switch showTp := show.Tp; showTp {
case ast.ShowProcedureStatus:
p.SetSchema(buildShowProcedureSchema())
case ast.ShowTriggers:
p.SetSchema(buildShowTriggerSchema())
case ast.ShowEvents:
p.SetSchema(buildShowEventsSchema())
case ast.ShowWarnings, ast.ShowErrors:
p.SetSchema(buildShowWarningsSchema())
default:
switch showTp {
case ast.ShowTables, ast.ShowTableStatus:
if p.DBName == "" {
return nil, ErrNoDB
}
case ast.ShowCreateTable:
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.AllPrivMask, show.Table.Schema.L, show.Table.Name.L, "")
}
p.SetSchema(buildShowSchema(show))
}
for _, col := range p.schema.Columns {
col.UniqueID = b.ctx.GetSessionVars().AllocPlanColumnID()
}
mockTablePlan := LogicalTableDual{}.init(b.ctx)
mockTablePlan.SetSchema(p.schema)
if show.Pattern != nil {
show.Pattern.Expr = &ast.ColumnNameExpr{
Name: &ast.ColumnName{Name: p.Schema().Columns[0].ColName},
}
expr, _, err := b.rewrite(show.Pattern, mockTablePlan, nil, false)
if err != nil {
return nil, errors.Trace(err)
}
p.Conditions = append(p.Conditions, expr)
}
if show.Where != nil {
conds := splitWhere(show.Where)
for _, cond := range conds {
expr, _, err := b.rewrite(cond, mockTablePlan, nil, false)
if err != nil {
return nil, errors.Trace(err)
}
p.Conditions = append(p.Conditions, expr)
}
p.ResolveIndices()
}
return p, nil
}
func (b *planBuilder) buildSimple(node ast.StmtNode) Plan {
p := &Simple{Statement: node}
switch raw := node.(type) {
case *ast.CreateUserStmt, *ast.DropUserStmt, *ast.AlterUserStmt:
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.CreateUserPriv, "", "", "")
case *ast.GrantStmt:
b.visitInfo = collectVisitInfoFromGrantStmt(b.visitInfo, raw)
case *ast.SetPwdStmt, *ast.RevokeStmt:
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.SuperPriv, "", "", "")
case *ast.KillStmt:
// If you have the SUPER privilege, you can kill all threads and statements.
// Otherwise, you can kill only your own threads and statements.
sm := b.ctx.GetSessionManager()
if sm != nil {
processList := sm.ShowProcessList()
if pi, ok := processList[raw.ConnectionID]; ok {
loginUser := b.ctx.GetSessionVars().User
if pi.User != loginUser.Username {
b.visitInfo = appendVisitInfo(b.visitInfo, mysql.SuperPriv, "", "", "")
}
}
}
}
return p
}
func collectVisitInfoFromGrantStmt(vi []visitInfo, stmt *ast.GrantStmt) []visitInfo {
// To use GRANT, you must have the GRANT OPTION privilege,
// and you must have the privileges that you are granting.
dbName := stmt.Level.DBName
tableName := stmt.Level.TableName
vi = appendVisitInfo(vi, mysql.GrantPriv, dbName, tableName, "")
var allPrivs []mysql.PrivilegeType
for _, item := range stmt.Privs {
if item.Priv == mysql.AllPriv {
switch stmt.Level.Level {
case ast.GrantLevelGlobal:
allPrivs = mysql.AllGlobalPrivs
case ast.GrantLevelDB:
allPrivs = mysql.AllDBPrivs
case ast.GrantLevelTable:
allPrivs = mysql.AllTablePrivs
}
break
}
vi = appendVisitInfo(vi, item.Priv, dbName, tableName, "")
}
for _, priv := range allPrivs {
vi = appendVisitInfo(vi, priv, dbName, tableName, "")
}
return vi
}
func (b *planBuilder) getDefaultValue(col *table.Column) (*expression.Constant, error) {
value, err := table.GetColDefaultValue(b.ctx, col.ToInfo())
if err != nil {
return nil, errors.Trace(err)
}
return &expression.Constant{Value: value, RetType: &col.FieldType}, nil
}
func (b *planBuilder) findDefaultValue(cols []*table.Column, name *ast.ColumnName) (*expression.Constant, error) {
for _, col := range cols {
if col.Name.L == name.Name.L {
return b.getDefaultValue(col)
}
}
return nil, ErrUnknownColumn.GenByArgs(name.Name.O, "field_list")
}
// resolveGeneratedColumns resolves generated columns with their generation
// expressions respectively. onDups indicates which columns are in on-duplicate list.
func (b *planBuilder) resolveGeneratedColumns(columns []*table.Column, onDups map[string]struct{}, mockPlan LogicalPlan) (igc InsertGeneratedColumns, err error) {
for _, column := range columns {
if !column.IsGenerated() {
continue
}
columnName := &ast.ColumnName{Name: column.Name}
columnName.SetText(column.Name.O)
colExpr, _, err := mockPlan.findColumn(columnName)
if err != nil {
return igc, errors.Trace(err)
}
expr, _, err := b.rewrite(column.GeneratedExpr, mockPlan, nil, true)
if err != nil {
return igc, errors.Trace(err)
}
expr = expression.BuildCastFunction(b.ctx, expr, colExpr.GetType())
igc.Columns = append(igc.Columns, columnName)
igc.Exprs = append(igc.Exprs, expr)
if onDups == nil {
continue
}
for dep := range column.Dependences {
if _, ok := onDups[dep]; ok {
assign := &expression.Assignment{Col: colExpr, Expr: expr}
igc.OnDuplicates = append(igc.OnDuplicates, assign)
break
}
}
}
return igc, nil
}
func (b *planBuilder) buildInsert(insert *ast.InsertStmt) (Plan, error) {
ts, ok := insert.Table.TableRefs.Left.(*ast.TableSource)
if !ok {
return nil, infoschema.ErrTableNotExists.GenByArgs()
}
tn, ok := ts.Source.(*ast.TableName)
if !ok {
return nil, infoschema.ErrTableNotExists.GenByArgs()
}
tableInfo := tn.TableInfo
// Build Schema with DBName otherwise ColumnRef with DBName cannot match any Column in Schema.
schema := expression.TableInfo2SchemaWithDBName(b.ctx, tn.Schema, tableInfo)
tableInPlan, ok := b.is.TableByID(tableInfo.ID)
if !ok {
return nil, errors.Errorf("Can't get table %s.", tableInfo.Name.O)
}
insertPlan := Insert{
Table: tableInPlan,
Columns: insert.Columns,
tableSchema: schema,
IsReplace: insert.IsReplace,
}.init(b.ctx)
b.visitInfo = append(b.visitInfo, visitInfo{
privilege: mysql.InsertPriv,
db: tn.DBInfo.Name.L,
table: tableInfo.Name.L,
})
mockTablePlan := LogicalTableDual{}.init(b.ctx)
mockTablePlan.SetSchema(insertPlan.tableSchema)
checkRefColumn := func(n ast.Node) ast.Node {
if insertPlan.NeedFillDefaultValue {
return n
}
switch n.(type) {
case *ast.ColumnName, *ast.ColumnNameExpr:
insertPlan.NeedFillDefaultValue = true
}
return n
}
if len(insert.Setlist) > 0 {
// Branch for `INSERT ... SET ...`.
err := b.buildSetValuesOfInsert(insert, insertPlan, mockTablePlan, checkRefColumn)
if err != nil {
return nil, errors.Trace(err)
}
} else if len(insert.Lists) > 0 {
// Branch for `INSERT ... VALUES ...`.
err := b.buildValuesListOfInsert(insert, insertPlan, mockTablePlan, checkRefColumn)
if err != nil {
return nil, errors.Trace(err)
}
} else {
// Branch for `INSERT ... SELECT ...`.
err := b.buildSelectPlanOfInsert(insert, insertPlan)
if err != nil {
return nil, errors.Trace(err)
}
}
mockTablePlan.SetSchema(insertPlan.Schema4OnDuplicate)
columnByName := make(map[string]*table.Column, len(insertPlan.Table.Cols()))
for _, col := range insertPlan.Table.Cols() {
columnByName[col.Name.L] = col
}
onDupColSet, dupCols, err := insertPlan.validateOnDup(insert.OnDuplicate, columnByName, tableInfo)
if err != nil {
return nil, errors.Trace(err)
}
for i, assign := range insert.OnDuplicate {
// Construct the function which calculates the assign value of the column.
expr, err1 := b.rewriteInsertOnDuplicateUpdate(assign.Expr, mockTablePlan, insertPlan)
if err1 != nil {
return nil, errors.Trace(err1)
}
insertPlan.OnDuplicate = append(insertPlan.OnDuplicate, &expression.Assignment{
Col: dupCols[i],
Expr: expr,
})
}
// Calculate generated columns.
mockTablePlan.schema = insertPlan.tableSchema
insertPlan.GenCols, err = b.resolveGeneratedColumns(insertPlan.Table.Cols(), onDupColSet, mockTablePlan)