pub unsafe fn BeginCopyFrom(
arg_pstate: *mut ParseState,
arg_rel: Relation,
arg_whereClause: *mut Node,
arg_filename: *const c_char,
arg_is_program: bool,
arg_data_source_cb: copy_data_source_cb,
arg_attnamelist: *mut List,
arg_options: *mut List,
) -> CopyFromState