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Date: Thu, 3 Mar 2011 01:21:36 +0000 (UTC)
From: "Olga Natkovich (JIRA)" <jira@apache.org>
To: pig-dev@hadoop.apache.org
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Subject: [jira] Updated: (PIG-1573) PIG shouldn't pass all input to a UDF if
 the UDF specify no argument
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     [ https://issues.apache.org/jira/browse/PIG-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Olga Natkovich updated PIG-1573:
--------------------------------

    Fix Version/s: 0.10

> 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: Daniel Dai
>             Fix For: 0.10
>
>
> 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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