func (isNull IsNull) Or(conds ...Cond) Cond {
	return Or(isNull, Or(conds...))
}
Or implements Or with other conditions
package builder
import "fmt"
type IsNull [1]string
var _ Cond = IsNull{""}
func (isNull IsNull) WriteTo(w Writer) error {
	_, err := fmt.Fprintf(w, "%s IS NULL", isNull[0])
	return err
}
func (isNull IsNull) And(conds ...Cond) Cond {
	return And(isNull, And(conds...))
}