planbuilder

package
v2.0.0-beta.2+incompat... Latest Latest
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 Go to latest Published: Apr 15, 2016 License: BSD-3-Clause Imports: 8 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrTooComplex indicates given sql query is too complex.
	ErrTooComplex = errors.New("Complex")
)

Functions

func FormatImpossible 

func FormatImpossible(buf *sqlparser.TrackedBuffer, node sqlparser.SQLNode)

FormatImpossible is a callback function used by TrackedBuffer to generate a modified version of the query where all selects have impossible where clauses. It overrides a few node types and passes the rest down to the default FormatNode.

func GenerateDeleteOuterQuery 

func GenerateDeleteOuterQuery(del *sqlparser.Delete) *sqlparser.ParsedQuery

GenerateDeleteOuterQuery generates the outer query for deletes.

func GenerateDeleteSubquery 

func GenerateDeleteSubquery(del *sqlparser.Delete, tableInfo *schema.Table) *sqlparser.ParsedQuery

GenerateDeleteSubquery generates the subquery for deletes.

func GenerateFieldQuery 

func GenerateFieldQuery(statement sqlparser.Statement) *sqlparser.ParsedQuery

GenerateFieldQuery generates a query to just fetch the field info by adding impossible where clauses as needed.

func GenerateFullQuery 

func GenerateFullQuery(statement sqlparser.Statement) *sqlparser.ParsedQuery

GenerateFullQuery generates the full query from the ast.

func GenerateInsertOuterQuery 

func GenerateInsertOuterQuery(ins *sqlparser.Insert) *sqlparser.ParsedQuery

GenerateInsertOuterQuery generates the outer query for inserts.

func GenerateSelectLimitQuery 

func GenerateSelectLimitQuery(selStmt sqlparser.SelectStatement) *sqlparser.ParsedQuery

GenerateSelectLimitQuery generates a select query with a limit clause.

func GenerateSelectOuterQuery 

func GenerateSelectOuterQuery(sel *sqlparser.Select, tableInfo *schema.Table) *sqlparser.ParsedQuery

GenerateSelectOuterQuery generates the outer query for dmls.

func GenerateSelectSubquery 

func GenerateSelectSubquery(sel *sqlparser.Select, tableInfo *schema.Table, index string) *sqlparser.ParsedQuery

GenerateSelectSubquery generates the subquery for selects.

func GenerateSubquery 

func GenerateSubquery(columns []string, table *sqlparser.AliasedTableExpr, where *sqlparser.Where, order sqlparser.OrderBy, limit *sqlparser.Limit, forUpdate bool) *sqlparser.ParsedQuery

GenerateSubquery generates a subquery based on the input parameters.

func GenerateUpdateOuterQuery 

func GenerateUpdateOuterQuery(upd *sqlparser.Update) *sqlparser.ParsedQuery

GenerateUpdateOuterQuery generates the outer query for updates.

func GenerateUpdateSubquery 

func GenerateUpdateSubquery(upd *sqlparser.Update, tableInfo *schema.Table) *sqlparser.ParsedQuery

GenerateUpdateSubquery generates the subquery for updats.

Types

type DDLPlan 

type DDLPlan struct {
	Action    string
	TableName string
	NewName   string
}

DDLPlan provides a plan for DDLs.

func DDLParse 

func DDLParse(sql string) (plan *DDLPlan)

DDLParse parses a DDL and produces a DDLPlan.

type ExecPlan 

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.
	// IndexUsed is set only for PlanSelectSubquery
	OuterQuery  *sqlparser.ParsedQuery `json:",omitempty"`
	Subquery    *sqlparser.ParsedQuery `json:",omitempty"`
	UpsertQuery *sqlparser.ParsedQuery `json:",omitempty"`
	IndexUsed   string                 `json:",omitempty"`

	// For selects, columns to be returned
	// For PlanInsertSubquery, columns to be inserted
	ColumnNumbers []int `json:",omitempty"`

	// PlanPKIn, PlanDMLPK: where clause values
	// PlanInsertPK: values clause
	PKValues []interface{} `json:",omitempty"`

	// PK_IN. Limit clause value.
	Limit 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"`

	// PlanSet
	SetKey   string      `json:",omitempty"`
	SetValue interface{} `json:",omitempty"`
}

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

func GetExecPlan 

func GetExecPlan(sql string, getTable TableGetter) (plan *ExecPlan, err error)

GetExecPlan generates a ExecPlan given a sql query and a TableGetter.

func GetStreamExecPlan 

func GetStreamExecPlan(sql string, getTable TableGetter) (plan *ExecPlan, err error)

GetStreamExecPlan generates a ExecPlan given a sql query and a TableGetter.

type PlanType 

type PlanType int

PlanType indicates a query plan type. 

const (
	// PlanPassSelect is pass through select statements. This is the
	// default plan for select statements.
	PlanPassSelect PlanType = iota
	// PlanPassDML is pass through update & delete statements. This is
	// the default plan for update and delete statements.
	PlanPassDML
	// PlanPKEqual is deprecated. Use PlanPKIn instead.
	PlanPKEqual
	// PlanPKIn is select statement with a single IN clause on primary key
	PlanPKIn
	// PlanSelectSubquery is select statement with a subselect statement
	PlanSelectSubquery
	// 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
	// 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
	// PlanUpsertPK is for insert ... on duplicate key constructs
	PlanUpsertPK
	// PlanNextval is for NEXTVAL
	PlanNextval
	// NumPlans stores the total number of plans
	NumPlans
)

func PlanByName 

func PlanByName(s string) (pt PlanType, ok bool)

PlanByName find a PlanType by its string name.

func (PlanType) IsSelect 

func (pt PlanType) IsSelect() bool

IsSelect returns true if PlanType is about a select query.

func (PlanType) MarshalJSON 

func (pt PlanType) MarshalJSON() ([]byte, error)

MarshalJSON returns a json string for PlanType.

func (PlanType) MinRole 

func (pt PlanType) MinRole() tableacl.Role

MinRole is the minimum Role required to execute this PlanType.

func (PlanType) String 

func (pt PlanType) String() string

type ReasonType 

type ReasonType int

ReasonType indicates why a query plan fails to build 

const (
	ReasonDefault ReasonType = iota
	ReasonSelect
	ReasonTable
	ReasonNocache
	ReasonSelectList
	ReasonLock
	ReasonWhere
	ReasonOrder
	ReasonLimit
	ReasonPKIndex
	ReasonCovering
	ReasonNoIndexMatch
	ReasonTableNoIndex
	ReasonPKChange
	ReasonHasHints
	ReasonComplexExpr
	ReasonUpsert
)

Reason codes give a hint about why a certain plan was chosen.

func (ReasonType) MarshalJSON 

func (rt ReasonType) MarshalJSON() ([]byte, error)

MarshalJSON returns a json string for ReasonType.

func (ReasonType) String 

func (rt ReasonType) String() string

String returns a string representation of a ReasonType.

type TableGetter 

type TableGetter func(tableName string) (*schema.Table, bool)

TableGetter returns a schema.Table given the table name.

Source Files

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