func (e *Evaluator) evalAggAvg(v *ast.AggregateFuncExpr) { ctx := v.GetContext() switch x := ctx.Value.(type) { case float64: t := x / float64(ctx.Count) ctx.Value = t v.SetFloat64(t) case mysql.Decimal: t := x.Div(mysql.NewDecimalFromUint(uint64(ctx.Count), 0)) ctx.Value = t v.SetMysqlDecimal(t) } }