pg_ls_dir ( dirname text [, missing_ok boolean, include_dot_dirs boolean ] ) → setof textReturns the names of all files (and directories and other special files) in the specified directory. The
include_dot_dirs parameter indicates whether “.” and “..” are to be included in the result set; the default is to exclude them. Including them can be useful when missing_ok is true, to distinguish an empty directory from a non-existent directory.