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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (PIG-1573) PIG shouldn't pass all input to a UDF if the UDF specify no argument
Date Tue, 14 Sep 2010 14:08:35 GMT

     [ https://issues.apache.org/jira/browse/PIG-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alan Gates reassigned PIG-1573:
-------------------------------

    Assignee: Daniel Dai  (was: 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: Daniel Dai
>             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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