pub unsafe fn BeginCopyFrom(
arg_pstate: *mut ParseState,
arg_rel: *mut RelationData,
arg_whereClause: *mut Node,
arg_filename: *const i8,
arg_is_program: bool,
arg_data_source_cb: Option<unsafe extern "C-unwind" fn(*mut c_void, i32, i32) -> i32>,
arg_attnamelist: *mut List,
arg_options: *mut List,
) -> *mut CopyFromStateData