Split/Chunk operator

[Mohsen Bande]

it would be nice to have a split (python) operator, which takes a job that
returns a list and streams each item to the specified job. like this
pattern:http://www.workflowpatterns.com/patterns/control/basic/wcp2.php
also, a chunk operator that splits a list to smaller chunks is more general
solution
is there any try on this already?
any help would be highly appreciated