Create an AlgebraicEvalFunc and AccumulatorEvalFunc abstract class which gives
you the lower levels for free
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Key: PIG-2551
URL: https://issues.apache.org/jira/browse/PIG-2551
Project: Pig
Issue Type: Improvement
Reporter: Jonathan Coveney
Assignee: Jonathan Coveney
Priority: Minor
Fix For: 0.11
This is more of a win for the Algebraic interface than the Accumulator
interface, but the idea is that if you implement the Algebraic interface, you
should get Accumulator/EvalFunc for free, and if you implement Accumulator, you
should get EvalFunc for free. The win of this is that in cases such as JRuby,
you don't have to muck around doing this yourself...you have them implement the
algebraic portion, and the rest comes free (that is where this came out of, but
I feel like it is generally useful enough).
The next piece of work I'd like to do is making an easier to implement way to
make Algebraic UDFs, but then again, my to do is huge :) Would love thoughts on
this. If it doesn't make it into Pig, it's still going to come in the JRuby
stuff, so I thought it'd at least be worth having it separate, tested, and
available to everyone.
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