func (e *Evaluator) handleArithmeticOp(o *ast.BinaryOperationExpr) bool { a, err := types.CoerceArithmetic(e.sc, *o.L.GetDatum()) if err != nil { e.err = errors.Trace(err) return false } b, err := types.CoerceArithmetic(e.sc, *o.R.GetDatum()) if err != nil { e.err = errors.Trace(err) return false } a, b, err = types.CoerceDatum(e.sc, a, b) if err != nil { e.err = errors.Trace(err) return false } if a.IsNull() || b.IsNull() { o.SetNull() return true } var result types.Datum switch o.Op { case opcode.Plus: result, e.err = types.ComputePlus(a, b) case opcode.Minus: result, e.err = types.ComputeMinus(a, b) case opcode.Mul: result, e.err = types.ComputeMul(a, b) case opcode.Div: result, e.err = types.ComputeDiv(e.sc, a, b) case opcode.Mod: result, e.err = types.ComputeMod(e.sc, a, b) case opcode.IntDiv: result, e.err = types.ComputeIntDiv(e.sc, a, b) default: e.err = ErrInvalidOperation.Gen("invalid op %v in arithmetic operation", o.Op) return false } o.SetDatum(result) return e.err == nil }