Github user satishd commented on the pull request:
https://github.com/apache/storm/pull/1050#issuecomment-176607781
Do we need MapProcessor/MapFunction as it looks very similar to each
operation (EachProcessor)?
```java
public Stream each(Fields inputFields, Function function, Fields
functionFields)
public Stream each(Function function, Fields functionFields)
```
Agree with @ptgoetz on filter.
Good to have flatMap operation.
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