func NewQualifiedStar(table string) *Star {
	return &Star{table}
}
NewQualifiedStar returns a new star expression only for a specific table.
package expression
import (
	"fmt"
	"github.com/src-d/go-mysql-server/sql"
)
type Star struct {
	Table string
}
func NewStar() *Star {
	return new(Star)
}