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https://issues.apache.org/jira/browse/PIG-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xuefu Zhang reassigned PIG-1573:
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Assignee: Xuefu Zhang
> PIG shouldn't pass all input to a UDF if the UDF specify no argument
> --------------------------------------------------------------------
>
> Key: PIG-1573
> URL: https://issues.apache.org/jira/browse/PIG-1573
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Fix For: 0.9.0
>
>
> Currently If in a pig script user uses a UDF with no argument, PIG backend
> assumes that the UDF takes all input so at run time it passes all input as a
> tuple to the UDF. This assumption is incorrect, causing conceptual
> confusions. If a UDF takes all input, it can specify a star (*) as its
> argument. If it specify no argument at all, then we assume that it requires
> no input data.
> We need to differentiate no input and all input for a UDF. Thus, in case that
> a UDF specify no argument, backend should pass the UDF an empty tuple.
> See notes in PIG-1586 for more information.
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