675 lines
20 KiB
Go
675 lines
20 KiB
Go
// Copyright 2015 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package plan
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import (
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"github.com/juju/errors"
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"github.com/pingcap/tidb/ast"
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"github.com/pingcap/tidb/context"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/model"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/parser/opcode"
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"github.com/pingcap/tidb/table"
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"github.com/pingcap/tidb/terror"
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"github.com/pingcap/tidb/util/charset"
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"github.com/pingcap/tidb/util/types"
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)
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// Error instances.
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var (
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ErrUnsupportedType = terror.ClassOptimizerPlan.New(CodeUnsupportedType, "Unsupported type")
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SystemInternalErrorType = terror.ClassOptimizerPlan.New(SystemInternalError, "System internal error")
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ErrUnknownColumn = terror.ClassOptimizerPlan.New(CodeUnknownColumn, "Unknown column '%s' in '%s'")
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)
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// Error codes.
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const (
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CodeUnsupportedType terror.ErrCode = 1
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SystemInternalError terror.ErrCode = 2
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CodeUnknownColumn terror.ErrCode = 1054
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)
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func init() {
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tableMySQLErrCodes := map[terror.ErrCode]uint16{
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CodeUnknownColumn: mysql.ErrBadField,
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}
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terror.ErrClassToMySQLCodes[terror.ClassOptimizerPlan] = tableMySQLErrCodes
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}
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// planBuilder builds Plan from an ast.Node.
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// It just builds the ast node straightforwardly.
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type planBuilder struct {
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err error
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hasAgg bool
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obj interface{}
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allocator *idAllocator
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ctx context.Context
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is infoschema.InfoSchema
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outerSchemas []expression.Schema
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// colMapper stores the column that must be pre-resolved.
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colMapper map[*ast.ColumnNameExpr]int
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}
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func (b *planBuilder) build(node ast.Node) Plan {
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switch x := node.(type) {
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case *ast.AdminStmt:
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return b.buildAdmin(x)
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case *ast.AlterTableStmt:
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return b.buildDDL(x)
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case *ast.CreateDatabaseStmt:
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return b.buildDDL(x)
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case *ast.CreateIndexStmt:
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return b.buildDDL(x)
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case *ast.CreateTableStmt:
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return b.buildDDL(x)
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case *ast.DeallocateStmt:
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return &Deallocate{Name: x.Name}
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case *ast.DeleteStmt:
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return b.buildDelete(x)
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case *ast.DropDatabaseStmt:
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return b.buildDDL(x)
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case *ast.DropIndexStmt:
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return b.buildDDL(x)
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case *ast.DropTableStmt:
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return b.buildDDL(x)
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case *ast.ExecuteStmt:
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return b.buildExecute(x)
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case *ast.ExplainStmt:
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return b.buildExplain(x)
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case *ast.InsertStmt:
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return b.buildInsert(x)
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case *ast.LoadDataStmt:
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return b.buildLoadData(x)
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case *ast.PrepareStmt:
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return b.buildPrepare(x)
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case *ast.SelectStmt:
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return b.buildSelect(x)
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case *ast.UnionStmt:
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return b.buildUnion(x)
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case *ast.UpdateStmt:
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return b.buildUpdate(x)
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case *ast.ShowStmt:
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return b.buildShow(x)
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case *ast.DoStmt:
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return b.buildDo(x)
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case *ast.SetStmt:
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return b.buildSet(x)
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case *ast.AnalyzeTableStmt, *ast.BinlogStmt, *ast.FlushTableStmt, *ast.UseStmt,
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*ast.BeginStmt, *ast.CommitStmt, *ast.RollbackStmt, *ast.CreateUserStmt, *ast.SetPwdStmt,
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*ast.GrantStmt, *ast.DropUserStmt, *ast.AlterUserStmt:
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return b.buildSimple(node.(ast.StmtNode))
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case *ast.TruncateTableStmt:
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return b.buildDDL(x)
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}
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b.err = ErrUnsupportedType.Gen("Unsupported type %T", node)
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return nil
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}
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func (b *planBuilder) buildExecute(v *ast.ExecuteStmt) Plan {
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vars := make([]expression.Expression, 0, len(v.UsingVars))
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for _, expr := range v.UsingVars {
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newExpr, _, err := b.rewrite(expr, nil, nil, true)
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if err != nil {
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b.err = errors.Trace(err)
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}
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vars = append(vars, newExpr)
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}
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exe := &Execute{Name: v.Name, UsingVars: vars}
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return exe
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}
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func (b *planBuilder) buildDo(v *ast.DoStmt) Plan {
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exprs := make([]expression.Expression, 0, len(v.Exprs))
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dual := &TableDual{
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baseLogicalPlan: newBaseLogicalPlan(Dual, b.allocator),
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}
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dual.self = dual
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for _, astExpr := range v.Exprs {
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expr, _, err := b.rewrite(astExpr, dual, nil, true)
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if err != nil {
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b.err = errors.Trace(err)
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return nil
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}
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exprs = append(exprs, expr)
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}
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p := &Projection{
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Exprs: exprs,
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baseLogicalPlan: newBaseLogicalPlan(Proj, b.allocator),
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}
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p.initIDAndContext(b.ctx)
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addChild(p, dual)
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p.self = p
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return p
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}
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func (b *planBuilder) buildSet(v *ast.SetStmt) Plan {
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p := &Set{}
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p.tp = St
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p.allocator = b.allocator
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for _, vars := range v.Variables {
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assign := &expression.VarAssignment{
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Name: vars.Name,
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IsGlobal: vars.IsGlobal,
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IsSystem: vars.IsSystem,
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}
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if _, ok := vars.Value.(*ast.DefaultExpr); !ok {
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assign.Expr, _, b.err = b.rewrite(vars.Value, nil, nil, true)
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if b.err != nil {
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return nil
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}
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} else {
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assign.IsDefault = true
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}
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if vars.ExtendValue != nil {
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assign.ExtendValue = &expression.Constant{
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Value: vars.ExtendValue.Datum,
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RetType: &vars.ExtendValue.Type,
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}
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}
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p.VarAssigns = append(p.VarAssigns, assign)
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}
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p.initIDAndContext(b.ctx)
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return p
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}
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// Detect aggregate function or groupby clause.
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func (b *planBuilder) detectSelectAgg(sel *ast.SelectStmt) bool {
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if sel.GroupBy != nil {
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return true
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}
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for _, f := range sel.GetResultFields() {
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if ast.HasAggFlag(f.Expr) {
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return true
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}
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}
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if sel.Having != nil {
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if ast.HasAggFlag(sel.Having.Expr) {
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return true
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}
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}
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if sel.OrderBy != nil {
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for _, item := range sel.OrderBy.Items {
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if ast.HasAggFlag(item.Expr) {
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return true
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}
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}
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}
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return false
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}
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func availableIndices(table *ast.TableName) (indices []*model.IndexInfo, includeTableScan bool) {
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var usableHints []*ast.IndexHint
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for _, hint := range table.IndexHints {
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if hint.HintScope == ast.HintForScan {
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usableHints = append(usableHints, hint)
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}
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}
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publicIndices := make([]*model.IndexInfo, 0, len(table.TableInfo.Indices))
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for _, index := range table.TableInfo.Indices {
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if index.State == model.StatePublic {
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publicIndices = append(publicIndices, index)
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}
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}
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if len(usableHints) == 0 {
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return publicIndices, true
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}
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var hasUse bool
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var ignores []*model.IndexInfo
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for _, hint := range usableHints {
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switch hint.HintType {
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case ast.HintUse, ast.HintForce:
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// Currently we don't distinguish between Force and Use because our cost estimation is not reliable.
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hasUse = true
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for _, idxName := range hint.IndexNames {
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idx := findIndexByName(publicIndices, idxName)
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if idx != nil {
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indices = append(indices, idx)
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}
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}
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case ast.HintIgnore:
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// Collect all the ignore index hints.
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for _, idxName := range hint.IndexNames {
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idx := findIndexByName(publicIndices, idxName)
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if idx != nil {
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ignores = append(ignores, idx)
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}
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}
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}
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}
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indices = removeIgnores(indices, ignores)
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// If we have got FORCE or USE index hint, table scan is excluded.
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if len(indices) != 0 {
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return indices, false
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}
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if hasUse {
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// Empty use hint means don't use any index.
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return nil, true
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}
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return removeIgnores(publicIndices, ignores), true
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}
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func removeIgnores(indices, ignores []*model.IndexInfo) []*model.IndexInfo {
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if len(ignores) == 0 {
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return indices
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}
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var remainedIndices []*model.IndexInfo
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for _, index := range indices {
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if findIndexByName(ignores, index.Name) == nil {
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remainedIndices = append(remainedIndices, index)
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}
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}
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return remainedIndices
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}
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func findIndexByName(indices []*model.IndexInfo, name model.CIStr) *model.IndexInfo {
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for _, idx := range indices {
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if idx.Name.L == name.L {
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return idx
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}
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}
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return nil
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}
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func (b *planBuilder) buildSelectLock(src Plan, lock ast.SelectLockType) *SelectLock {
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selectLock := &SelectLock{
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Lock: lock,
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baseLogicalPlan: newBaseLogicalPlan(Lock, b.allocator),
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}
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selectLock.self = selectLock
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selectLock.initIDAndContext(b.ctx)
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addChild(selectLock, src)
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selectLock.SetSchema(src.GetSchema())
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return selectLock
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}
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func (b *planBuilder) buildPrepare(x *ast.PrepareStmt) Plan {
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p := &Prepare{
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Name: x.Name,
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}
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if x.SQLVar != nil {
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p.SQLText, _ = x.SQLVar.GetValue().(string)
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} else {
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p.SQLText = x.SQLText
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}
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return p
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}
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func (b *planBuilder) buildAdmin(as *ast.AdminStmt) Plan {
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var p Plan
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switch as.Tp {
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case ast.AdminCheckTable:
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p = &CheckTable{Tables: as.Tables}
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case ast.AdminShowDDL:
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p = &ShowDDL{}
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p.SetSchema(buildShowDDLFields())
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default:
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b.err = ErrUnsupportedType.Gen("Unsupported type %T", as)
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}
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return p
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}
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func buildShowDDLFields() expression.Schema {
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schema := make(expression.Schema, 0, 6)
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schema = append(schema, buildColumn("", "SCHEMA_VER", mysql.TypeLonglong, 4))
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schema = append(schema, buildColumn("", "OWNER", mysql.TypeVarchar, 64))
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schema = append(schema, buildColumn("", "JOB", mysql.TypeVarchar, 128))
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schema = append(schema, buildColumn("", "BG_SCHEMA_VER", mysql.TypeLonglong, 4))
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schema = append(schema, buildColumn("", "BG_OWNER", mysql.TypeVarchar, 64))
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schema = append(schema, buildColumn("", "BG_JOB", mysql.TypeVarchar, 128))
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return schema
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}
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func buildColumn(tableName, name string, tp byte, size int) *expression.Column {
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cs := charset.CharsetBin
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cl := charset.CharsetBin
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flag := mysql.UnsignedFlag
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if tp == mysql.TypeVarchar || tp == mysql.TypeBlob {
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cs = mysql.DefaultCharset
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cl = mysql.DefaultCollationName
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flag = 0
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}
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fieldType := &types.FieldType{
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Charset: cs,
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Collate: cl,
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Tp: tp,
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Flen: size,
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Flag: uint(flag),
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}
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return &expression.Column{
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ColName: model.NewCIStr(name),
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TblName: model.NewCIStr(tableName),
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DBName: model.NewCIStr(infoschema.Name),
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RetType: fieldType,
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}
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}
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// splitWhere split a where expression to a list of AND conditions.
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func splitWhere(where ast.ExprNode) []ast.ExprNode {
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var conditions []ast.ExprNode
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switch x := where.(type) {
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case nil:
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case *ast.BinaryOperationExpr:
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if x.Op == opcode.AndAnd {
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conditions = append(conditions, splitWhere(x.L)...)
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conditions = append(conditions, splitWhere(x.R)...)
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} else {
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conditions = append(conditions, x)
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}
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case *ast.ParenthesesExpr:
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conditions = append(conditions, splitWhere(x.Expr)...)
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default:
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conditions = append(conditions, where)
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}
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return conditions
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}
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func (b *planBuilder) buildShow(show *ast.ShowStmt) Plan {
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var resultPlan Plan
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p := &Show{
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Tp: show.Tp,
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DBName: show.DBName,
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Table: show.Table,
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Column: show.Column,
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Flag: show.Flag,
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Full: show.Full,
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User: show.User,
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baseLogicalPlan: newBaseLogicalPlan("Show", b.allocator),
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}
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resultPlan = p
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p.initIDAndContext(b.ctx)
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p.self = p
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switch show.Tp {
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case ast.ShowProcedureStatus:
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p.SetSchema(buildShowProcedureSchema())
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case ast.ShowTriggers:
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p.SetSchema(buildShowTriggerSchema())
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case ast.ShowEvents:
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p.SetSchema(buildShowEventsSchema())
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default:
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p.SetSchema(expression.ResultFieldsToSchema(show.GetResultFields()))
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}
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for i, col := range p.schema {
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col.Position = i
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}
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var conditions []expression.Expression
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if show.Pattern != nil {
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expr, _, err := b.rewrite(show.Pattern, p, nil, false)
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if err != nil {
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b.err = errors.Trace(err)
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return nil
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}
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conditions = append(conditions, expr)
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}
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if show.Where != nil {
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conds := splitWhere(show.Where)
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for _, cond := range conds {
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expr, _, err := b.rewrite(cond, p, nil, false)
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if err != nil {
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b.err = errors.Trace(err)
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return nil
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}
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conditions = append(conditions, expr)
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}
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}
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if len(conditions) != 0 {
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sel := &Selection{
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baseLogicalPlan: newBaseLogicalPlan(Sel, b.allocator),
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Conditions: conditions,
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}
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sel.initIDAndContext(b.ctx)
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sel.self = sel
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addChild(sel, p)
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resultPlan = sel
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}
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return resultPlan
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}
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func (b *planBuilder) buildSimple(node ast.StmtNode) Plan {
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return &Simple{Statement: node}
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}
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func (b *planBuilder) getDefaultValue(col *table.Column) (*expression.Constant, error) {
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if value, ok, err := table.GetColDefaultValue(b.ctx, col.ToInfo()); ok {
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if err != nil {
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return nil, errors.Trace(err)
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}
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return &expression.Constant{Value: value, RetType: &col.FieldType}, nil
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}
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return &expression.Constant{RetType: &col.FieldType}, nil
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}
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func (b *planBuilder) findDefaultValue(cols []*table.Column, name *ast.ColumnName) (*expression.Constant, error) {
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for _, col := range cols {
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if col.Name.L == name.Name.L {
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return b.getDefaultValue(col)
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}
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}
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return nil, ErrUnknownColumn.GenByArgs(name.Name.O, "field_list")
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}
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func (b *planBuilder) buildInsert(insert *ast.InsertStmt) Plan {
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// Get Table
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ts, ok := insert.Table.TableRefs.Left.(*ast.TableSource)
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if !ok {
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b.err = infoschema.ErrTableNotExists.GenByArgs()
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return nil
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}
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tn, ok := ts.Source.(*ast.TableName)
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if !ok {
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b.err = infoschema.ErrTableNotExists.GenByArgs()
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return nil
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}
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tableInfo := tn.TableInfo
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schema := expression.TableInfo2Schema(tableInfo)
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table, ok := b.is.TableByID(tableInfo.ID)
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if !ok {
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b.err = errors.Errorf("Can't get table %s.", tableInfo.Name.O)
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return nil
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}
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insertPlan := &Insert{
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Table: table,
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Columns: insert.Columns,
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tableSchema: schema,
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IsReplace: insert.IsReplace,
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Priority: insert.Priority,
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Ignore: insert.Ignore,
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baseLogicalPlan: newBaseLogicalPlan(Ins, b.allocator),
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}
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cols := table.Cols()
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for _, valuesItem := range insert.Lists {
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exprList := make([]expression.Expression, 0, len(valuesItem))
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for i, valueItem := range valuesItem {
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var expr expression.Expression
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var err error
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if dft, ok := valueItem.(*ast.DefaultExpr); ok {
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if dft.Name != nil {
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expr, err = b.findDefaultValue(cols, dft.Name)
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} else {
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expr, err = b.getDefaultValue(cols[i])
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}
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} else if val, ok := valueItem.(*ast.ValueExpr); ok {
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expr = &expression.Constant{
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Value: val.Datum,
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RetType: &val.Type,
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}
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} else {
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expr, _, err = b.rewrite(valueItem, nil, nil, true)
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}
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if err != nil {
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b.err = errors.Trace(err)
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}
|
|
exprList = append(exprList, expr)
|
|
}
|
|
insertPlan.Lists = append(insertPlan.Lists, exprList)
|
|
}
|
|
for _, assign := range insert.Setlist {
|
|
col, err := schema.FindColumn(assign.Column)
|
|
if err != nil {
|
|
b.err = errors.Trace(err)
|
|
return nil
|
|
}
|
|
if col == nil {
|
|
b.err = errors.Errorf("Can't find column %s", assign.Column)
|
|
return nil
|
|
}
|
|
// Here we keep different behaviours with MySQL. MySQL allow set a = b, b = a and the result is NULL, NULL.
|
|
// It's unreasonable.
|
|
expr, _, err := b.rewrite(assign.Expr, nil, nil, true)
|
|
if err != nil {
|
|
b.err = errors.Trace(err)
|
|
return nil
|
|
}
|
|
insertPlan.Setlist = append(insertPlan.Setlist, &expression.Assignment{
|
|
Col: col,
|
|
Expr: expr,
|
|
})
|
|
}
|
|
mockTablePlan := &TableDual{}
|
|
mockTablePlan.SetSchema(schema)
|
|
for _, assign := range insert.OnDuplicate {
|
|
col, err := schema.FindColumn(assign.Column)
|
|
if err != nil {
|
|
b.err = errors.Trace(err)
|
|
return nil
|
|
}
|
|
if col == nil {
|
|
b.err = errors.Errorf("Can't find column %s", assign.Column)
|
|
return nil
|
|
}
|
|
expr, _, err := b.rewrite(assign.Expr, mockTablePlan, nil, true)
|
|
if err != nil {
|
|
b.err = errors.Trace(err)
|
|
return nil
|
|
}
|
|
insertPlan.OnDuplicate = append(insertPlan.OnDuplicate, &expression.Assignment{
|
|
Col: col,
|
|
Expr: expr,
|
|
})
|
|
}
|
|
insertPlan.initIDAndContext(b.ctx)
|
|
insertPlan.self = insertPlan
|
|
if insert.Select != nil {
|
|
selectPlan := b.build(insert.Select)
|
|
if b.err != nil {
|
|
return nil
|
|
}
|
|
addChild(insertPlan, selectPlan)
|
|
}
|
|
return insertPlan
|
|
}
|
|
|
|
func (b *planBuilder) buildLoadData(ld *ast.LoadDataStmt) Plan {
|
|
p := &LoadData{
|
|
IsLocal: ld.IsLocal,
|
|
Path: ld.Path,
|
|
Table: ld.Table,
|
|
FieldsInfo: ld.FieldsInfo,
|
|
LinesInfo: ld.LinesInfo,
|
|
}
|
|
return p
|
|
}
|
|
|
|
func (b *planBuilder) buildDDL(node ast.DDLNode) Plan {
|
|
return &DDL{Statement: node}
|
|
}
|
|
|
|
func (b *planBuilder) buildExplain(explain *ast.ExplainStmt) Plan {
|
|
if show, ok := explain.Stmt.(*ast.ShowStmt); ok {
|
|
return b.buildShow(show)
|
|
}
|
|
targetPlan, err := Optimize(b.ctx, explain.Stmt, b.is)
|
|
if err != nil {
|
|
b.err = errors.Trace(err)
|
|
return nil
|
|
}
|
|
p := &Explain{StmtPlan: targetPlan}
|
|
addChild(p, targetPlan)
|
|
schema := make(expression.Schema, 0, 3)
|
|
schema = append(schema, &expression.Column{
|
|
ColName: model.NewCIStr("ID"),
|
|
RetType: types.NewFieldType(mysql.TypeString),
|
|
})
|
|
schema = append(schema, &expression.Column{
|
|
ColName: model.NewCIStr("Json"),
|
|
RetType: types.NewFieldType(mysql.TypeString),
|
|
})
|
|
schema = append(schema, &expression.Column{
|
|
ColName: model.NewCIStr("ParentID"),
|
|
RetType: types.NewFieldType(mysql.TypeString),
|
|
})
|
|
p.SetSchema(schema)
|
|
return p
|
|
}
|
|
|
|
func buildShowProcedureSchema() expression.Schema {
|
|
tblName := "ROUTINES"
|
|
schema := make(expression.Schema, 0, 11)
|
|
schema = append(schema, buildColumn(tblName, "Db", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Name", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Type", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Definer", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Modified", mysql.TypeDatetime, 19))
|
|
schema = append(schema, buildColumn(tblName, "Created", mysql.TypeDatetime, 19))
|
|
schema = append(schema, buildColumn(tblName, "Security_type", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Comment", mysql.TypeBlob, 196605))
|
|
schema = append(schema, buildColumn(tblName, "character_set_client", mysql.TypeVarchar, 32))
|
|
schema = append(schema, buildColumn(tblName, "collation_connection", mysql.TypeVarchar, 32))
|
|
schema = append(schema, buildColumn(tblName, "Database Collation", mysql.TypeVarchar, 32))
|
|
return schema
|
|
}
|
|
|
|
func buildShowTriggerSchema() expression.Schema {
|
|
tblName := "TRIGGERS"
|
|
schema := make(expression.Schema, 0, 11)
|
|
schema = append(schema, buildColumn(tblName, "Trigger", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Event", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Table", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Statement", mysql.TypeBlob, 196605))
|
|
schema = append(schema, buildColumn(tblName, "Timing", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Created", mysql.TypeDatetime, 19))
|
|
schema = append(schema, buildColumn(tblName, "sql_mode", mysql.TypeBlob, 8192))
|
|
schema = append(schema, buildColumn(tblName, "Definer", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "character_set_client", mysql.TypeVarchar, 32))
|
|
schema = append(schema, buildColumn(tblName, "collation_connection", mysql.TypeVarchar, 32))
|
|
schema = append(schema, buildColumn(tblName, "Database Collation", mysql.TypeVarchar, 32))
|
|
return schema
|
|
}
|
|
|
|
func buildShowEventsSchema() expression.Schema {
|
|
tblName := "EVENTS"
|
|
schema := make(expression.Schema, 0, 15)
|
|
schema = append(schema, buildColumn(tblName, "Db", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Name", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Time zone", mysql.TypeVarchar, 32))
|
|
schema = append(schema, buildColumn(tblName, "Definer", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Type", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Execute At", mysql.TypeDatetime, 19))
|
|
schema = append(schema, buildColumn(tblName, "Interval Value", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Interval Field", mysql.TypeVarchar, 128))
|
|
schema = append(schema, buildColumn(tblName, "Starts", mysql.TypeDatetime, 19))
|
|
schema = append(schema, buildColumn(tblName, "Ends", mysql.TypeDatetime, 19))
|
|
schema = append(schema, buildColumn(tblName, "Status", mysql.TypeVarchar, 32))
|
|
schema = append(schema, buildColumn(tblName, "Originator", mysql.TypeInt24, 4))
|
|
schema = append(schema, buildColumn(tblName, "character_set_client", mysql.TypeVarchar, 32))
|
|
schema = append(schema, buildColumn(tblName, "collation_connection", mysql.TypeVarchar, 32))
|
|
schema = append(schema, buildColumn(tblName, "Database Collation", mysql.TypeVarchar, 32))
|
|
return schema
|
|
}
|