In this post, I am sharing a script to find a list of Roles with its associated member information in Greenplum.
Greenplum provides workload management using the concept of Resource Queues so for that DBA should know about Roles and their members.

Using below script, you can get the information of Greenplum Roles and its members/users information.

select
   t.rarolename as RoleName
   ,t.ramembername as RoleMember
from pg_roles pr,
(
	select gra.rarolename, gra.ramembername
	from pg_roles spr,
	gp_toolkit.gp_roles_assigned gra
	where  gra.rarolename = spr.rolname
	and  spr.rolcanlogin = 'f'
) as t
where pr.rolcanlogin =  'f'
	and pr.rolname = t.rarolename
order by t.rarolename, t.ramembername;