sample

Documentation

Index

• type Argument
  • func GenerateFromPipelineOperator(opr *pipeline.Instruction) *Argument
  • func NewArgument() *Argument
  • func NewMergeSample(rowSampleArg *Argument, outputRowCount bool) *Argument
  • func NewSampleByPercent(percent float64, sampleExprs, groupExprs []*plan.Expr) *Argument
  • func NewSampleByRows(rows int, sampleExprs, groupExprs []*plan.Expr, usingRow bool, ...) *Argument
  • func (arg *Argument) Call(proc *process.Process) (vm.CallResult, error)
  • func (arg *Argument) ConvertToPipelineOperator(in *pipeline.Instruction)
  • func (arg *Argument) Free(proc *process.Process, pipelineFailed bool, err error)
  • func (arg *Argument) GetOperatorBase() *vm.OperatorBase
  • func (arg *Argument) IsByPercent() bool
  • func (arg *Argument) IsMergeSampleByRow() bool
  • func (arg *Argument) Prepare(proc *process.Process) (err error)
  • func (arg *Argument) Release()
  • func (arg *Argument) SimpleDup() *Argument
  • func (arg *Argument) String(buf *bytes.Buffer)
  • func (arg Argument) TypeName() string

Types

type Argument

type Argument struct {

	// it determines which sample action (random sample by rows / percents, sample by order and so on) to take.
	Type int
	// UsingBlock is used to speed up the sample process but will cause centroids skewed.
	// If true, the sample action will randomly stop the sample process after it has sampled enough rows.
	UsingBlock bool
	// NeedOutputRowSeen indicates whether the sample operator needs to output the count of row seen as the last column.
	NeedOutputRowSeen bool

	Rows     int
	Percents float64

	// sample(expression1, expression2, ..., number)'s expression.
	SampleExprs []*plan.Expr

	// group by expr1, expr2 ...
	GroupExprs []*plan.Expr

	IBucket, NBucket int

	vm.OperatorBase
	// contains filtered or unexported fields
}

func GenerateFromPipelineOperator

func GenerateFromPipelineOperator(opr *pipeline.Instruction) *Argument

func NewArgument

func NewArgument() *Argument

func NewMergeSample

func NewMergeSample(rowSampleArg *Argument, outputRowCount bool) *Argument

func NewSampleByPercent

func NewSampleByPercent(percent float64, sampleExprs, groupExprs []*plan.Expr) *Argument

func NewSampleByRows

func NewSampleByRows(rows int, sampleExprs, groupExprs []*plan.Expr, usingRow bool, outputRowCount bool) *Argument

func (*Argument) Call

func (arg *Argument) Call(proc *process.Process) (vm.CallResult, error)

func (*Argument) ConvertToPipelineOperator

func (arg *Argument) ConvertToPipelineOperator(in *pipeline.Instruction)

func (*Argument) Free

func (arg *Argument) Free(proc *process.Process, pipelineFailed bool, err error)

func (*Argument) GetOperatorBase

func (arg *Argument) GetOperatorBase() *vm.OperatorBase

func (*Argument) IsByPercent

func (arg *Argument) IsByPercent() bool

func (*Argument) IsMergeSampleByRow

func (arg *Argument) IsMergeSampleByRow() bool

func (*Argument) Prepare

func (arg *Argument) Prepare(proc *process.Process) (err error)

func (*Argument) Release

func (arg *Argument) Release()

func (*Argument) SimpleDup

func (arg *Argument) SimpleDup() *Argument

func (*Argument) String

func (arg *Argument) String(buf *bytes.Buffer)

func (Argument) TypeName

func (arg Argument) TypeName() string