xeval

Documentation

Index

• Constants
• Variables
• func ComputeArithmetic(op tipb.ExprType, left types.Datum, 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.

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.