xeval

Documentation

Index

• Constants
• Variables
• func ComputeArithmetic(op tipb.ExprType, left types.Datum, right types.Datum) (types.Datum, error)
• func ComputeBit(op tipb.ExprType, left, right types.Datum) (types.Datum, error)
• type Evaluator
  • func (e *Evaluator) Eval(expr *tipb.Expr) (types.Datum, error)

Constants

const (
	CodeInvalid = 3
)

Error codes.

Variables

var (
	ErrInvalid = terror.ClassXEval.New(CodeInvalid, "invalid operation")
)

Error instances.

Functions

func ComputeArithmetic

func ComputeArithmetic(op tipb.ExprType, left types.Datum, right types.Datum) (types.Datum, error)

ComputeArithmetic computes the arithmetic operation on two datums.

func ComputeBit

func ComputeBit(op tipb.ExprType, left, right types.Datum) (types.Datum, error)

ComputeBit computes the bitwise operation on two datums.

Types

type Evaluator

type Evaluator struct {
	Row map[int64]types.Datum // column values.
	// contains filtered or unexported fields
}

Evaluator evaluates tipb.Expr.

func (*Evaluator) Eval

func (e *Evaluator) Eval(expr *tipb.Expr) (types.Datum, error)

Eval evaluates expr to a Datum.