process

Documentation

Index

• func FreeRegisters(proc *Process)
• func Get(proc *Process, size int64, typ types.Type) (*vector.Vector, error)
• func GetSels(proc *Process) []int64
• func Put(proc *Process, vec *vector.Vector)
• func PutSels(sels []int64, proc *Process)
• type Limitation
• type Process
  • func New(m *mheap.Mheap) *Process
  • func NewFromProc(m *mheap.Mheap, p *Process, regNumber int) *Process
  • func (proc *Process) AllocScalarNullVector(typ types.Type) *vector.Vector
  • func (proc *Process) AllocScalarVector(typ types.Type) *vector.Vector
  • func (proc *Process) AllocVector(typ types.Type, size int64) (*vector.Vector, error)
  • func (proc *Process) GetBoolTyp(typ types.Type) (typ2 types.Type)
• type Register
• type SessionInfo
  • func (si *SessionInfo) GetCharset() string
  • func (si *SessionInfo) GetCollation() string
  • func (si *SessionInfo) GetConnectionID() uint64
  • func (si *SessionInfo) GetDatabase() string
  • func (si *SessionInfo) GetHost() string
  • func (si *SessionInfo) GetRole() string
  • func (si *SessionInfo) GetUser() string
  • func (si *SessionInfo) GetUserHost() string
  • func (si *SessionInfo) GetVersion() string
• type WaitRegister

Functions

func FreeRegisters

func FreeRegisters(proc *Process)

func Get

func Get(proc *Process, size int64, typ types.Type) (*vector.Vector, error)

func GetSels

func GetSels(proc *Process) []int64

func Put

func Put(proc *Process, vec *vector.Vector)

func PutSels

func PutSels(sels []int64, proc *Process)

Types

type Limitation

type Limitation struct {
	// Size, memory threshold.
	Size int64
	// BatchRows, max rows for batch.
	BatchRows int64
	// BatchSize, max size for batch.
	BatchSize int64
	// PartitionRows, max rows for partition.
	PartitionRows int64
}

Limitation specifies the maximum resources that can be used in one query.

type Process

type Process struct {
	// Id, query id.
	Id  string
	Reg Register
	Lim Limitation
	Mp  *mheap.Mheap

	// unix timestamp
	UnixTime int64

	// snapshot is transaction context
	Snapshot []byte

	SessionInfo SessionInfo

	// snapshot is transaction context
	Cancel context.CancelFunc
}

Process contains context used in query execution one or more pipeline will be generated for one query, and one pipeline has one process instance.

func New

func New(m *mheap.Mheap) *Process

New creates a new Process. A process stores the execution context.

func NewFromProc

func NewFromProc(m *mheap.Mheap, p *Process, regNumber int) *Process

NewFromProc create a new Process based on another process.

func (*Process) AllocScalarNullVector

func (proc *Process) AllocScalarNullVector(typ types.Type) *vector.Vector

func (*Process) AllocScalarVector

func (proc *Process) AllocScalarVector(typ types.Type) *vector.Vector

func (*Process) AllocVector

func (proc *Process) AllocVector(typ types.Type, size int64) (*vector.Vector, error)

func (*Process) GetBoolTyp

func (proc *Process) GetBoolTyp(typ types.Type) (typ2 types.Type)

type Register

type Register struct {
	// Ss, temporarily stores the row number list in the execution of operators
	// and it can be reused in the future execution.
	Ss [][]int64
	// InputBatch, stores the result of the previous operator.
	InputBatch *batch.Batch
	// Vecs, temporarily stores the column data in the execution of operators
	// and it can be reused in the future execution to avoid mem alloc and type casting overhead.
	Vecs []*vector.Vector
	// MergeReceivers, receives result of multi previous operators from other pipelines
	// e.g. merge operator.
	MergeReceivers []*WaitRegister
}

Register used in execution pipeline and shared with all operators of the same pipeline.

type SessionInfo

type SessionInfo struct {
	User         string
	Host         string
	Role         string
	ConnectionID uint64
	Database     string
	Version      string
}

session information

func (*SessionInfo) GetCharset

func (si *SessionInfo) GetCharset() string

func (*SessionInfo) GetCollation

func (si *SessionInfo) GetCollation() string

func (*SessionInfo) GetConnectionID

func (si *SessionInfo) GetConnectionID() uint64

func (*SessionInfo) GetDatabase

func (si *SessionInfo) GetDatabase() string

func (*SessionInfo) GetHost

func (si *SessionInfo) GetHost() string

func (*SessionInfo) GetRole

func (si *SessionInfo) GetRole() string

func (*SessionInfo) GetUser

func (si *SessionInfo) GetUser() string

func (*SessionInfo) GetUserHost

func (si *SessionInfo) GetUserHost() string

func (*SessionInfo) GetVersion

func (si *SessionInfo) GetVersion() string

type WaitRegister

type WaitRegister struct {
	Ctx context.Context
	Ch  chan *batch.Batch
}

WaitRegister channel