Esempio n. 1
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func (e *Evaluator) evalAggGroupConcat(v *ast.AggregateFuncExpr) {
	ctx := v.GetContext()
	if ctx.Buffer != nil {
		v.SetValue(ctx.Buffer.String())
	} else {
		v.SetValue(nil)
	}
}
Esempio n. 2
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func (e *Evaluator) evalAggAvg(v *ast.AggregateFuncExpr) {
	ctx := v.GetContext()
	switch x := ctx.Value.(type) {
	case float64:
		ctx.Value = x / float64(ctx.Count)
	case mysql.Decimal:
		ctx.Value = x.Div(mysql.NewDecimalFromUint(uint64(ctx.Count), 0))
	}
	v.SetValue(ctx.Value)
}
Esempio n. 3
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func (e *Evaluator) aggregateFunc(v *ast.AggregateFuncExpr) bool {
	idx := e.aggregateMap[v]
	aggr := e.aggregators[idx]
	if e.aggregateDone {
		v.SetValue(aggr.Output())
		return true
	}
	// TODO: currently only single argument aggregate functions are supported.
	e.err = aggr.Input(v.Args[0].GetValue())
	return e.err == nil
}
Esempio n. 4
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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()
		t := x.Div(mysql.NewDecimalFromUint(uint64(ctx.Count), 0))
		v.SetMysqlDecimal(t)
	}
	ctx.Value = *v.GetDatum()
}
Esempio n. 5
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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 mysql.MyDecimal
		y.FromUint(uint64(ctx.Count))
		mysql.DecimalDiv(x, &y, &to, mysql.DivFracIncr)
		to.Round(&to, ctx.Value.Frac()+mysql.DivFracIncr)
		v.SetMysqlDecimal(&to)
	}
	ctx.Value = *v.GetDatum()
}
Esempio n. 6
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func (e *Evaluator) evalAggFirstRow(v *ast.AggregateFuncExpr) {
	ctx := v.GetContext()
	v.SetValue(ctx.Value)
}
Esempio n. 7
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func (e *Evaluator) evalAggCount(v *ast.AggregateFuncExpr) {
	ctx := v.GetContext()
	v.SetValue(ctx.Count)
}