bda20adf_Cascading_2_1_User_Guide__Pipe_type
[Purpose] apply a filter or function, or branch a stream [Input] tuple stream (grouped or not) [Output] a tuple stream, optionally filtered or transformed [Pipe type] 
Each
P i p e
S u b A s s e m b l y
E a c h
M e r g e
G r o u p B y
E v e r y
C o G r o u p
H a s h J o i n
Cascading 2.1 User Guide
Pipe type