Probably not what you want to hear, but the scalding dev team is really only developing + supporting the Typed API at this point -- which would make something like this even more difficult. But the question I'd probably ask is what are you trying to do, and can you use strong types, the Typed Api, and maybe an extractor method or similar instead?
On Fri, Jun 30, 2017 at 2:13 PM, <[email protected]> wrote: > Here is the question: > > Assume I have a pipe and I want to rename all the fields in the pipe > programmatically, meaning that I don't want to hard code the field names in > my code. Any idea how I can do this? > > As a concrete example, assume I have a pipe with two fields: "name" and > "age" and I want to rename these fields to "employee_name" and > "employee_age". Obviously the natural solution is to write a piece of code > as below: > > pipe.rename(('name, 'age) -> ('employee_name, 'employee_age)) > > or > > pipe.rename(new Fields("name", "age") -> new Fields("employee_name", > "employee_age")) > > However, what I need is to be able to iterate through all fields in the > pipe without knowing their names. > > There are a couple of methods (resolveIncomingOperationArgumentFields and > resolveIncomingOperationPassThroughFields) callable on a pipe which look > promising but the issue is that they both take and input argument of type > cascading.flow.planner.Scope which I don't know where can I get it from in > a scalding job. > > Another solution that comes to my mind is using "each" method on the pipe > and implementing a cascading function and pass it to the each statement. > But I was now able to find any sample code for that either. > > Thanks! > > -- > You received this message because you are subscribed to the Google Groups > "Scalding Development" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- Alex Levenson @THISWILLWORK -- You received this message because you are subscribed to the Google Groups "Scalding Development" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
