func (af *avgFunction) calculateResult(ctx *ast.AggEvaluateContext) (d types.Datum) {
switch ctx.Value.Kind() {
case types.KindFloat64:
t := ctx.Value.GetFloat64() / float64(ctx.Count)
d.SetValue(t)
case types.KindMysqlDecimal:
x := ctx.Value.GetMysqlDecimal()
y := types.NewDecFromInt(ctx.Count)
to := new(types.MyDecimal)
types.DecimalDiv(x, y, to, types.DivFracIncr)
to.Round(to, ctx.Value.Frac()+types.DivFracIncr)
d.SetMysqlDecimal(to)
}
return
}
func (e *Evaluator) evalAggAvg(v *ast.AggregateFuncExpr) {
ctx := v.GetContext()
switch ctx.Value.Kind() {
case types.KindFloat64:
t := ctx.Value.GetFloat64() / float64(ctx.Count)
v.SetValue(t)
case types.KindMysqlDecimal:
x := ctx.Value.GetMysqlDecimal()
var y, to types.MyDecimal
y.FromUint(uint64(ctx.Count))
types.DecimalDiv(x, &y, &to, types.DivFracIncr)
to.Round(&to, ctx.Value.Frac()+types.DivFracIncr)
v.SetMysqlDecimal(&to)
}
ctx.Value = *v.GetDatum()
}
