Role inheritance and Conflicting Parameter Values

Hi,
I'm trying to set the default statement_timeout parameter for two different groups of users. However, as many of the users inherit from overlapping roles, I wanted to get clarification on how inheritance of parameter values worked when a role inherits from other roles that all have different settings for a parameter value.

For instance, assume three roles: 'user1', 'role2', 'role3'. The 'user1' role can login and inherits from 'role2' and 'role3'.

ALTER ROLE user1 SET statement_timeout=0;
ALTER ROLE role2 SET statement_timeout=1000;
ALTER ROLE role3 SET statement_timeout=3000;

In this scenario, which value of statement_timeout does user1 get? Also, if the primary role (user1) doesn't have a value set, how is the parameter inherited between role2 and role3?

Also, as a superuser, can I examine the parameter values for another user to make sure I set this correctly. For instance, I'd like to run a query in the spirit of this invalid query: "SHOW statement_timeout FOR user1;". Unfortunately, SHOW only shows my parameters, though it would be nice to examine other accounts.
Thanks, Robert

Robert McGehee, CFA
Geode Capital Management, LLC
One Post Office Square, 20th Floor | Boston, MA | 02109
Direct: (617)392-8396

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