Can we write our own niladic functions in 8.0.0? I want to write a niladic function similar to current_timestamp, but I did not find any information in the documentation.
If you mean a function without any arguments, it is trivial:
CREATE FUNCTION foo() RETURNS ... AS ...; SELECT foo();
If you mean a function that doesn't take any arguments and can be invoked without an empty set of parentheses (like current_timestamp), there isn't a way to define such a function via SQL. You could probably hack the SQL parser to add support for specific functions like this, as is done for current_timestamp and friends.
-Neil
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