How to get queries by a user group - sql

Question

I'd like to get all queries run by users in a specific user group for a Redshift database. Here's the query I'm running:
select
q.*,
u.usename,
swq.total_queue_time / 1000000 as queue_time
from stl_query q
inner join pg_user u on q.userid = u.usesysid
inner join pg_group g on u.usesysid = ANY (g.grolist)
inner join stl_wlm_query swq on q.query = swq.query
where q.userid <> 1
AND database = 'mydb'
AND g.groname = 'ops'
order by q.starttime desc;
However, I'm getting Column "g.grolist" has unsupported type "integer[]". I've tried other forms of the same query (e.g., putting the ANY condition in WHERE), but I keep getting the same error. How can I check whether a user ID occurs in the list of user IDs in pg_group?

Answer 1

I found this redshift guide having array types included in the unsupported list of PostgresSQL data types, and that's causing your SQL error of column has unsupported type.
Redshift is not exactly Postgres & thus doesn't have full feature support for all Postgres data types and functions. So refering redshift guide for any errors/differences in behaviour you encounter will be the best bet.
Find out more differences here: Amazon Redshift and PostgreSQL
For unsupported data types, it states:
If a query attempts to use an unsupported data type, including explicit or implicit casts, it will return an error.
However redshift does support some array & json-array function(s) which you can use to play with array column type. Like below query will output your desired result using array_to_string.
select
q.*,
u.usename,
swq.total_queue_time / 1000000 as queue_time
from stl_query q
inner join pg_user u on q.userid = u.usesysid
inner join pg_group g on array_to_string(g.grolist,',') like '%' || u.usesysid || '%'
inner join stl_wlm_query swq on q.query = swq.query
where q.userid <> 1
AND database = 'mydb'
AND g.groname = 'ops'
order by q.starttime desc;