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I suppose I_S.ENABLED_ROLES should return at least the same as CURRENT_ROLE, but in fact it's not always so.
--error 0,ER_CANNOT_USER
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drop role r1;
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create role r1;
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set role r1;
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select current_role();
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select * from information_schema.enabled_roles;
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drop role r1;
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select current_role();
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select * from information_schema.enabled_roles;
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After the role is dropped, current_role() still returns the name of the dropped role, while I_S.enabled_roles contains NULL:
drop role r1;
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select current_role();
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current_role()
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r1
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select * from information_schema.enabled_roles;
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ROLE_NAME
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NULL
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Since current_role behavior is the same as for current_user (if the user is dropped, current_user for an open session still returns the name), I guess I_S.enabled_roles should do the same.
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