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Internal functions are functions written in C which have been statically
linked into the Postgres backend
process. The AS
clause gives the C-language name of the function, which need not be the
same as the name being declared for SQL use.
(For reasons of backwards compatibility, an empty AS
string is accepted as meaning that the C-language function name is the
same as the SQL name.) Normally, all internal functions present in the
backend are declared as SQL functions during database initialization,
but a user could use CREATE FUNCTION
to create additional alias names for an internal function.
