trait Reducer[I, O] extends AnyRef
A 'reducer' for output of user-defined functions.
- Annotations
- @Evolving()
- Source
- Reducer.java
- Since
4.0.0
- See also
ReducibleFunction A user defined function f_source(x) is 'reducible' on another user_defined function f_target(x) if
- There exists a reducer function r(x) such that r(f_source(x)) = f_target(x) for all input x, or
- More generally, there exists reducer functions r1(x) and r2(x) such that r1(f_source(x)) = r2(f_target(x)) for all input x. where = means both value and data type match.
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- Deprecated
(Since version 9)