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Documentation: reference/reference_lua/box_session/euid

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	box.session.euid()
	return
	the effective user ID of the :ref:`current user <authentication-users>`.
	This is the same as :doc:`/reference/reference_lua/box_session/uid`, except in two cases:
	The first case: if the call to ``box.session.euid()`` is within a function invoked by :doc:`box.session.su(user-name, function-to-execute) </reference/reference_lua/box_session/su>` -- in that case, ``box.session.euid()`` returns the ID of the changed user (the user who is specified by the ``user-name`` parameter of the ``su`` function) but ``box.session.uid()`` returns the ID of the original user (the user who is calling the ``su`` function).
	The second case: if the call to ``box.session.euid()`` is within a function specified with :doc:`box.schema.func.create(function-name, {setuid= true}) </reference/reference_lua/box_schema/func_create>` and the binary protocol is in use -- in that case, ``box.session.euid()`` returns the ID of the user who created "function-name" but ``box.session.uid()`` returns the ID of the the user who is calling "function-name".
	rtype
	number
	Example:
	tarantool> box.session.su('admin') --- ... tarantool> box.session.uid(), box.session.euid() --- - 1 - 1 ... tarantool> function f() return {box.session.uid(),box.session.euid()} end --- ... tarantool> box.session.su('guest', f) --- - - 1 - 0 ...

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