xeval

package

v0.0.0-...-40faf7d Latest Latest Go to latest Published: Nov 24, 2016 License: Apache-2.0 Imports: 8 Imported by: 0

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const (
	CodeInvalid = 3
)

Error codes.

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

Error instances.

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

ComputeArithmetic computes the arithmetic operation on two datums.

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

ComputeBit computes the bitwise operation on two datums.

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

Evaluator evaluates tipb.Expr.

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

Eval evaluates expr to a Datum.