V$SQLFN_ARG_METADATA

V$SQLFN_ARG_METADATA contains metadata about function arguments. There is one row for each argument of every function found in V$SQLFN_METADATA. There are no rows for functions that do not have any arguments.

Column	Datatype	Description
`FUNC_ID`	`NUMBER`	Internal function identification number. This column can be used to join with the `V$SQLFN_METADATA` view.
`ARGNUM`	`NUMBER`	Argument number
`DATATYPE`	`VARCHAR2(8)`	Datatype of the argument. The value is NULL if this argument is not used. Otherwise, it can take values of any Oracle datatype, family datatype, or EXPR datatype.
`DESCR`	`VARCHAR2(30)`	This column is reserved for future use.