package aggregate

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

func AggSchemaName() Aggregator {
	return &SchemaName{}
}

type SchemaName struct {
	value string
}

func (a *SchemaName) Add(record *load.StmtRecord) {
	if a.value == "" {
		a.value = record.SchemaName
	}
}

func (a *SchemaName) Merge(agg Aggregator) {
	if agg, ok := agg.(*SchemaName); ok {
		if a.value == "" {
			a.value = agg.value
		}
	}
}

func (a *SchemaName) Output(model *api.Model) {
	model.SchemaName = a.value
}