code: func (c *Redshift) DescribeClusterParameterGroups(input *DescribeClusterParameterGroupsInput) (*DescribeClusterParameterGroupsOutput, error) {
  	req, out := c.DescribeClusterParameterGroupsRequest(input)
  	return out, req.Send()
  }
docs: // DescribeClusterParameterGroups API operation for Amazon Redshift.
  //
  // Returns a list of Amazon Redshift parameter groups, including parameter groups
  // you created and the default parameter group. For each parameter group, the
  // response includes the parameter group name, description, and parameter group
  // family name. You can optionally specify a name to retrieve the description
  // of a specific parameter group.
  //
  // For more information about parameters and parameter groups, go to Amazon
  // Redshift Parameter Groups (https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-parameter-groups.html)
  // in the Amazon Redshift Cluster Management Guide.
  //
  // If you specify both tag keys and tag values in the same request, Amazon Redshift
  // returns all parameter groups that match any combination of the specified
  // keys and values. For example, if you have owner and environment for tag keys,
  // and admin and test for tag values, all parameter groups that have any combination
  // of those values are returned.
  //
  // If both tag keys and values are omitted from the request, parameter groups
  // are returned regardless of whether they have tag keys or values associated
  // with them.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for Amazon Redshift's
  // API operation DescribeClusterParameterGroups for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeClusterParameterGroupNotFoundFault "ClusterParameterGroupNotFound"
  //   The parameter group name does not refer to an existing parameter group.
  //
  //   * ErrCodeInvalidTagFault "InvalidTagFault"
  //   The tag is invalid.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/DescribeClusterParameterGroups