package aggregate

import (
	"github.com/pingcap-inc/clinic/pkg/ngm/statements/api"
	"github.com/pingcap-inc/clinic/pkg/ngm/statements/load"
)

func AggSumRru() Aggregator {
	return &SumRru{}
}

type SumRru struct {
	sum float64
}

var _ Aggregator = (*SumRru)(nil)

func (a *SumRru) Add(record *load.StmtRecord) {
	a.sum += record.SumRRU
}

func (a *SumRru) Merge(agg Aggregator) {
	if agg, ok := agg.(*SumRru); ok {
		a.sum += agg.sum
	}
}

func (a *SumRru) Output(model *api.Model) {
	model.SumRru = a.sum
}