forked from vitessio/vitess
/
plan.go
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/
plan.go
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// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package planbuilder
import (
"encoding/json"
"errors"
"fmt"
"github.com/youtube/vitess/go/vt/schema"
"github.com/youtube/vitess/go/vt/sqlparser"
"github.com/youtube/vitess/go/vt/tableacl"
)
var (
// ErrTooComplex indicates given sql query is too complex.
ErrTooComplex = errors.New("Complex")
execLimit = &sqlparser.Limit{Rowcount: sqlparser.ValArg(":#maxLimit")}
)
// PlanType indicates a query plan type.
type PlanType int
const (
// PlanPassSelect is pass through select statements. This is the
// default plan for select statements.
PlanPassSelect PlanType = iota
// PlanSelectLock is for a select that locks.
PlanSelectLock
// PlanNextval is for NEXTVAL
PlanNextval
// PlanPassDML is pass through update & delete statements. This is
// the default plan for update and delete statements.
PlanPassDML
// PlanDMLPK is an update or delete with an equality where clause(s)
// on primary key(s)
PlanDMLPK
// PlanDMLSubquery is an update or delete with a subselect statement
PlanDMLSubquery
// PlanInsertPK is insert statement where the PK value is
// supplied with the query
PlanInsertPK
// PlanInsertSubquery is same as PlanDMLSubquery but for inserts
PlanInsertSubquery
// PlanUpsertPK is for insert ... on duplicate key constructs
PlanUpsertPK
// PlanSet is for SET statements
PlanSet
// PlanDDL is for DDL statements
PlanDDL
// PlanSelectStream is used for streaming queries
PlanSelectStream
// PlanOther is for SHOW, DESCRIBE & EXPLAIN statements
PlanOther
// NumPlans stores the total number of plans
NumPlans
)
// Must exactly match order of plan constants.
var planName = []string{
"PASS_SELECT",
"SELECT_LOCK",
"NEXTVAL",
"PASS_DML",
"DML_PK",
"DML_SUBQUERY",
"INSERT_PK",
"INSERT_SUBQUERY",
"UPSERT_PK",
"SET",
"DDL",
"SELECT_STREAM",
"OTHER",
}
func (pt PlanType) String() string {
if pt < 0 || pt >= NumPlans {
return ""
}
return planName[pt]
}
// PlanByName find a PlanType by its string name.
func PlanByName(s string) (pt PlanType, ok bool) {
for i, v := range planName {
if v == s {
return PlanType(i), true
}
}
return NumPlans, false
}
// IsSelect returns true if PlanType is about a select query.
func (pt PlanType) IsSelect() bool {
return pt == PlanPassSelect || pt == PlanSelectLock
}
// MarshalJSON returns a json string for PlanType.
func (pt PlanType) MarshalJSON() ([]byte, error) {
return json.Marshal(pt.String())
}
// MinRole is the minimum Role required to execute this PlanType.
func (pt PlanType) MinRole() tableacl.Role {
return tableAclRoles[pt]
}
var tableAclRoles = map[PlanType]tableacl.Role{
PlanPassSelect: tableacl.READER,
PlanSelectLock: tableacl.READER,
PlanSet: tableacl.READER,
PlanPassDML: tableacl.WRITER,
PlanDMLPK: tableacl.WRITER,
PlanDMLSubquery: tableacl.WRITER,
PlanInsertPK: tableacl.WRITER,
PlanInsertSubquery: tableacl.WRITER,
PlanDDL: tableacl.ADMIN,
PlanSelectStream: tableacl.READER,
PlanOther: tableacl.ADMIN,
PlanUpsertPK: tableacl.WRITER,
PlanNextval: tableacl.WRITER,
}
// ReasonType indicates why a query plan fails to build
type ReasonType int
// Reason codes give a hint about why a certain plan was chosen.
const (
ReasonDefault ReasonType = iota
ReasonTable
ReasonTableNoIndex
ReasonPKChange
ReasonComplexExpr
ReasonUpsert
)
// Must exactly match order of reason constants.
var reasonName = []string{
"DEFAULT",
"TABLE",
"TABLE_NOINDEX",
"PK_CHANGE",
"COMPLEX_EXPR",
"UPSERT",
}
// String returns a string representation of a ReasonType.
func (rt ReasonType) String() string {
return reasonName[rt]
}
// MarshalJSON returns a json string for ReasonType.
func (rt ReasonType) MarshalJSON() ([]byte, error) {
return ([]byte)(fmt.Sprintf("\"%s\"", rt.String())), nil
}
// ExecPlan is built for selects and DMLs.
// PK Values values within ExecPlan can be:
// sqltypes.Value: sourced form the query, or
// string: bind variable name starting with ':', or
// nil if no value was specified
type ExecPlan struct {
PlanID PlanType
Reason ReasonType `json:",omitempty"`
TableName string `json:",omitempty"`
// FieldQuery is used to fetch field info
FieldQuery *sqlparser.ParsedQuery `json:",omitempty"`
// FullQuery will be set for all plans.
FullQuery *sqlparser.ParsedQuery `json:",omitempty"`
// For PK plans, only OuterQuery is set.
// For SUBQUERY plans, Subquery is also set.
OuterQuery *sqlparser.ParsedQuery `json:",omitempty"`
Subquery *sqlparser.ParsedQuery `json:",omitempty"`
UpsertQuery *sqlparser.ParsedQuery `json:",omitempty"`
// PlanInsertSubquery: columns to be inserted.
ColumnNumbers []int `json:",omitempty"`
// PlanDMLPK: where clause values.
// PlanInsertPK: values clause.
PKValues []interface{} `json:",omitempty"`
// For update: set clause if pk is changing.
SecondaryPKValues []interface{} `json:",omitempty"`
// For PlanInsertSubquery: pk columns in the subquery result.
SubqueryPKColumns []int `json:",omitempty"`
}
func (plan *ExecPlan) setTableInfo(tableName string, getTable TableGetter) (*schema.Table, error) {
tableInfo, ok := getTable(tableName)
if !ok {
return nil, fmt.Errorf("table %s not found in schema", tableName)
}
plan.TableName = tableInfo.Name
return tableInfo, nil
}
// TableGetter returns a schema.Table given the table name.
type TableGetter func(tableName string) (*schema.Table, bool)
// GetExecPlan generates a ExecPlan given a sql query and a TableGetter.
func GetExecPlan(sql string, getTable TableGetter) (plan *ExecPlan, err error) {
statement, err := sqlparser.Parse(sql)
if err != nil {
return nil, err
}
switch stmt := statement.(type) {
case *sqlparser.Union:
return &ExecPlan{
PlanID: PlanPassSelect,
FieldQuery: GenerateFieldQuery(stmt),
FullQuery: GenerateFullQuery(stmt),
}, nil
case *sqlparser.Select:
return analyzeSelect(stmt, getTable)
case *sqlparser.Insert:
return analyzeInsert(stmt, getTable)
case *sqlparser.Update:
return analyzeUpdate(stmt, getTable)
case *sqlparser.Delete:
return analyzeDelete(stmt, getTable)
case *sqlparser.Set:
return analyzeSet(stmt), nil
case *sqlparser.DDL:
return analyzeDDL(stmt, getTable), nil
case *sqlparser.Other:
return &ExecPlan{PlanID: PlanOther}, nil
}
return nil, errors.New("invalid SQL")
}
// GetStreamExecPlan generates a ExecPlan given a sql query and a TableGetter.
func GetStreamExecPlan(sql string, getTable TableGetter) (plan *ExecPlan, err error) {
statement, err := sqlparser.Parse(sql)
if err != nil {
return nil, err
}
plan = &ExecPlan{
PlanID: PlanSelectStream,
FullQuery: GenerateFullQuery(statement),
}
switch stmt := statement.(type) {
case *sqlparser.Select:
if stmt.Lock != "" {
return nil, errors.New("select with lock not allowed for streaming")
}
if tableName := analyzeFrom(stmt.From); tableName != "" {
plan.setTableInfo(tableName, getTable)
}
case *sqlparser.Union:
// pass
default:
return nil, fmt.Errorf("'%v' not allowed for streaming", sqlparser.String(stmt))
}
return plan, nil
}