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https://issues.apache.org/jira/browse/PIG-2234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13127282#comment-13127282
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Jonathan Coveney commented on PIG-2234:
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How do you envision this being implemented on the backend?
> Alebraic udf Init and Intermediate functions should be able to return non
> tuple data types
> ------------------------------------------------------------------------------------------
>
> Key: PIG-2234
> URL: https://issues.apache.org/jira/browse/PIG-2234
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.8.0, 0.9.0
> Reporter: Thejas M Nair
>
> The exec() call to Algebraic UDF initial and intermediate classes are
> required to return a Tuple. This has been done because the output is
> collected in a DataBag and passed to Intermediate.exec() and Final.exec()
> calls, and DataBag in pig needs to contain a Tuple. But this results in
> additional Tuple objects getting created and also adds additional
> (de)serialization costs. Functions such as COUNT, SUM are also having to wrap
> the initial and intermediate results in Tuples.
> The Algebraic interface needs to change to reduce the costs for udfs that
> don't need an intermediate tuple .
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