It's the latter..
You can imagine my EvalFunc as
ArrayList<String> booksRead(Person p) {}
So for a list of people I get a List of ArrayList<String> of different lengths..
-----Original Message-----
From: Jonathan Coveney [mailto:[email protected]]
Sent: Wednesday, March 09, 2011 6:12 PM
To: [email protected]
Subject: Re: Schema
In any given instance will the size of the tuple change, or will it change on a
row by row basis? If it's the former, you can have a constructor that indicates
how many arguments, and the outputSchema can use that.
Barring that, it is "good practice" to do so, but it's not necessary. Your
script will work without it, but DESCRIBES will get thrown off.
2011/3/9 Lai Will <[email protected]>
> Hello,
>
> I read that it is good practice to declare the schema in Pig Script as
> well as in the UDF (by implementing outputSchema), because of
> performance reasons.
>
> Now in my case I have a EvalFunc that takes a chararray as input and
> produces a tuple with a dynamic number of chararrays (it creates it
> result by .newTuple(List list)).
> How can I specify a schema for an unknown number of elements?
>
> Best,
> Will
>
