code: func (s *ShowRetentionPoliciesStatement) String() string {
  	var buf bytes.Buffer
  	_, _ = buf.WriteString("SHOW RETENTION POLICIES")
  	if s.Database != "" {
  		_, _ = buf.WriteString(" ON ")
  		_, _ = buf.WriteString(QuoteIdent(s.Database))
  	}
  	return buf.String()
  }
docs: // String returns a string representation of a ShowRetentionPoliciesStatement.