If the file ends with a delimiter, no emptyrecord is propagated after the delimiter.
如果文件以分隔符结尾，则不会传播分隔符之后的空记录。
2
If the file begins with a delimiter, the node treats the (zero length) file contents preceding that delimiter as a record and propagates an emptyrecord to the flow.
如果文件以分隔符开始，则节点将该分隔符之前的(零长度)文件内容视为一个记录，并向流传播一个空记录。
3
where data_file is your LDAP directory output of one field per line and record separated by an empty line.