code: @Override
      public DeleteClusterParameterGroupResult deleteClusterParameterGroup(DeleteClusterParameterGroupRequest request) {
          request = beforeClientExecution(request);
          return executeDeleteClusterParameterGroup(request);
      }
docs: <p>
  Deletes a specified Amazon Redshift parameter group.
  </p>
  <note>
  <p>
  You cannot delete a parameter group if it is associated with a cluster.
  </p>
  </note>
  
  @param deleteClusterParameterGroupRequest
  @return Result of the DeleteClusterParameterGroup operation returned by the service.
  @throws InvalidClusterParameterGroupStateException
  The cluster parameter group action can not be completed because another task is in progress that involves
  the parameter group. Wait a few moments and try the operation again.
  @throws ClusterParameterGroupNotFoundException
  The parameter group name does not refer to an existing parameter group.
  @sample AmazonRedshift.DeleteClusterParameterGroup
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/DeleteClusterParameterGroup"
  target="_top">AWS API Documentation</a>