now() vs current_user

["Ottó Havasvölgyi" <havasvolgyi.otto@xxxxxxxxx>]

Hi,

What is the cause that "now()" works but "now" does not and
"current_user" works but "current_user()" does not. They are both
functions, and are present in pg_proc. How can I decide if a function
needs parentheses or not if it has no parameters?

Thanks in advance,
Otto

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