The following bug has been logged on the website:
Bug reference: 8212
Logged by: Geoff Montee
Email address: geoff.montee@gmail.com
PostgreSQL version: 9.2.4
Operating system: Linux
Description: =
When a user calls a function that has SECURITY DEFINER set, the value of
"current_user" is changed to the name of the role that defined the
function.
For some use cases, it would be useful to be able to obtain the original
value of "current_user" from within the function. Specifically, this would
make sense in trigger functions used for auditing, where recording only
session_user may not be sufficient.