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https://issues.apache.org/jira/browse/PIG-2965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760313#comment-13760313
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Dmitriy V. Ryaboy commented on PIG-2965:
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A UDF essentially has a constructor and an exec method. "foreach lines
udf(foo)" calls the exec method and passes to it the foo parameter. "define
udfinstance udf(foo)" passes foo to the constructor, and makes an instance of
the foo udf initialized in that way bound to "udfinstance" (so you can have
many differently initialized udfs in the same script). You can read more info
on all this in the docs about "define" keyword and the UDF author's guide.
> RANDOM should allow seed initialization for ease of testing
> -----------------------------------------------------------
>
> Key: PIG-2965
> URL: https://issues.apache.org/jira/browse/PIG-2965
> Project: Pig
> Issue Type: Bug
> Reporter: Aneesh Sharma
> Assignee: Jonathan Coveney
> Labels: newbie
> Attachments: PIG-2965-0.patch
>
>
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