taking field names as argument

[Xiaolin Li]

Hi,

I am trying to write a trait function in scalding to apply a mapping function on part of the fields in the pipe, and I want the function to take the list of fields as argument. Could anyone give me some hints on that? (sth like someMappingFun(self: Pipe, cols: Fields) : Pipe = {...}

Thank you! 

[P. Oscar Boykin]

that is how people do that in the deprecated Fields API. That is not really an issue with the TypedPipe API.

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[Xiaolin Li]

Thank you! Is it possible to mix the TypedPipe API with Field API together? My current functions are written in Fields APIs and migrating them to Field API may take some time.

[Oscar Boykin]

yes, you can move over bit, by bit.

To go from a `Pipe` to `TypedPipe` you need to use `TypedPipe.from[(Int, String, Long)](somePipe, ('som, 'b, 'other))` for instance.

Then to go back, use `TypedPipe.toPipe(('result, 'somethingelse))` for instance.