• Yes, UDFs can have default values for parameters in some systems.
• In the current system, a constant value needs to be provided in SQL when calling the function.
• Matan mentioned using a constant default value for now but aims to make the UDF more generic for future use.

Example in PostgreSQL:

CREATE FUNCTION gcd(int, int, int DEFAULT 0)

This syntax allows setting a default value for the third parameter in the UDF.