Alternatively, a way to get at the OuterUserId? Or the outer-most
current_user in the function stack?
I should explain why I need this: for audit functionality where I want
the triggers' procedures to be SECURITY DEFINER so only they can write
to audit tables and such, but I want them to see the current_user of the
*caller*, rather than current_user being the DEFINER's name.
Nico
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