how to call the Scan variadic function in Golang using reflection without looped ptrs?

I found an answer about how to call the Scan variadic function in Golang using reflection. And don't have reputation to ask in there.

Here the main part of code:

values := make([]interface{}, count)
valuePtrs := make([]interface{}, count)

for rows.Next() { 
    for i, _ := range columns {
        valuePtrs[i] = &values[i]
    }    
    rows.Scan(valuePtrs...)
    ...
}

And I don't get why is this statement have to be looped?

for i, _ := range columns { valuePtrs[i] = &values[i] }

Would valuePtrs be different on each iteration in golang? Or it's just mistake?