expr

type Ctx interface {
	Event() *metapb.UserEvent
	Profile([]byte) []byte
	KV([]byte) ([]byte, error)
	TotalCrowd() *roaring.Bitmap
	StepCrowd() *roaring.Bitmap
}

type Runtime interface {
	// Exec calc result using src event
	Exec(Ctx) (bool, interface{}, error)
	Keys(Ctx, bool, func([]byte)) error
}