Function pgrx_pg_sys::makeConst

pub unsafe fn makeConst(
    arg_consttype: Oid,
    arg_consttypmod: int32,
    arg_constcollid: Oid,
    arg_constlen: c_int,
    arg_constvalue: Datum,
    arg_constisnull: bool,
    arg_constbyval: bool
) -> *mut Const