grant permissions to set variable?

[Vivek Khera <vivek@xxxxxxxxx>]

I want to do some debugging on an app, and I'd like to set on a per- 
connection basis "set log_min_duration_statement = 10;"  Obviously  
since I'm not super user I get permission denied.

Is there some GRANT I can grant to the user in question to allow  
this?  I don't really want to do it globally or for all connections  
by that user, both of which are easy to do

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